Dead Samsung Galaxy S4 repair

[@hines1957]

Thank you for the detailed video! I have an S4 with the symptoms you describe. I performed a study of capacitors on the main board and found one with both terminals connected to ground with less than one Ohm resistance. This was in the vicinity of the volume buttons oddly enough, on the opposite side of the board where the shielded power supply section is where you made your repair. I removed the shielding anyway and examined all caps, but in all cases no more than one terminal had low resistance to ground. So it is looking like I just have the one bad cap. Now I just have to dig into an old phone or two to see if I can find a similar cap, or I supposed I can remove the cap, measure its dimensions precisely, and go looking for a form factor & color match at DigiKey.

[@JonnyFix]

+hines1957 Or remove it and see if phone works. Not all caps are needed. If it's not supporting a main power rail you may get away without it. If you can't figure out the value I have found a similar size seems to be enough. If on a main power rail tho you should measure the voltage to make sure it's stable. If not, it needs to be a higher value.

[@hines1957]

+Jonny Fix Thanks Jonny, good call. I know these caps are typically used to shunt noise to ground at a frequency related to the capacitance. I designed FPGA-based fiber optic comms boards at my last job, and with few exceptions I used caps to eliminate noise. I no longer have access to all the nice rework equipment and materials at work, so the main challenge now will be to replace the component for minimal cost. I like the idea of trying to get away without replacing the cap and if I can't find a suitable replacement in one of my old phones then I'll give that a try, but I would feel more comfortable if I could scope the signal to see how bad the noise is. I miss my National Instruments workstation. I suspect I can use the component dimensions with DigiKey product filters to get a range of possible values, then I can measure the capacitance of caps I salvage from old phones and pick one near the middle of the range.

[@junwhang6293]

There are not enough of videos showing how to do circuit level repair on samsung devices! Thank you!!

[@JonnyFix]

Yeah, I wish I could do more but I don't see that many devices, most are iphone.

[@ThingsWhichArentWork]

Another excellent repair video Jonny.... So let me get this straight.... basically, you kissed it better (or used your lip to work out what was wrong)... Awesome :) .. hope the new soldering iron arrives soon. Cheers!!

[@nz_jonny6117]

I'd rather use a thermal imaging camera but only because it's a neat toy :) Heat is the easiest tell tale sign of where the fault may be although you don't want to confuse it with something running warm normally like CPU or regulator.

[@kamOstadi]

OK,,,,, OK,,,,well,, , , ,I am happy to see this and repair my mini S4,,,,

[@Poebat]

Same exact symptoms. I plugged my phone into a shorted cable for about a week (it was retired so I just let sit plugged in for the next time I need it... well then it would not recognize the battery charge and refused to turn on unless it was plugged into the wall. It even gets hot when I plug it in without a battery!

[@e343balla]

Im kinda curious what kind of heat gun you were using and what that goo was that you were using to desolder? I got a GS4 in for repair but I cant quite get it to do anything. Battery, albeit slow at first, charges via my own GS4 Active, but the GS4 is just dead as a door nail. Im wondering if something similar to what you did would help me, as appose to my normal "Buy a new board" approach.

[@JonnyFix]

343eric The station I use is this www.jaycar.co.nz/Tools-%26-Soldering/Soldering/Stations/ESD-Safe-Solder-Desolder-Rework-Station/p/TS1574 . The goo is flux paste which is more useful when re-attaching parts, probably not totally necessary on removing small part but can help with larger SMDs as it can conduct the heat into the joints. Perhaps put your GS4 onto a bench supply and see how much current it wants to draw, or put an ammeter in series with supply if it has none. If nothing (I'd expect about 400mA or more during boot up), check for voltage on the power switch and that the switch is OK with an ohm meter. The part I removed at 14:30 is a capacitor, almost always brown in colour, the larger part just above that and grey looking is an inductor. One side of every inductor will connect to a cap and will have a voltage on it when turned on. If you get a small current draw when you turn phone on maybe test each inductor and see if one has no voltage (e.g. 1.2, 3.3, 5) if it's steady it's probably what it should be, if it's fluctuating or has none check for a short to ground on that line. Obviously any physical damage like corrosion from liquid or burnt items will need to be addressed first. Good luck!

[@mohammedaram7514]

good work why you don't use thermal camera to save time??

[@ssadda6626]

Hi again.. After reading more comments, I found your answer about testing the capacitors. Although it would be nice to see a new video explaining the procedure further. Another question: I have an S4 gt-i9506 and it appears that the power ic is bad. It won't turn on or even show the charging while off. The major problem is that the chip has PM894 on it and I only find PM8941 for Samsung S4 i9505 even on Google. Are PM894 and PM8841 interchangeable? Regards

[@JonnyFix]

I had a look and 894 doesn't seem to exist so I wonder do you have a microscope? Could it be the 1 has faded off the end? If the phone is not important (data etc) and if the 8941 connection layout is the same it could be worth just trying it. Otherwise if you need the data I would get a known good board from another phone and take the chip off that and reball it for yours.

[@ssadda6626]

@@JonnyFix Thanks for your reply. I used a magnifier. You are right, I missed the 1. I will attempt to replace it with pm8941 and see what happens. It's data I am hoping to retrieve. The phone becomes unusually warm when I put the battery in while turned off! I hope that this ci is the main cause.

[@RangyRs4]

haha i just noticed your voice reminds me of rhys darby. watched a few of your videos youre a very good technican thankyou heaps for all the vids

[@JonnyFix]

Cheers mate. That made me laugh :)

[@RangyRs4]

im from nz too been doing alot of phone repairs and laptop repars just started with tvs. i need to grab an esr meter from trademe!

[@JonnyFix]

Use extreme caution around the power supplies, especially in plasma TVs where the secondary rails can run a couple hundred volts to.

[@ssadda6626]

Hi.. nice work! How did you test these capacitors!?

[@VamptoristicOne]

ok...here's my problem. my s4 will no longer turn on (possibly by the abuse it's been exposed to due to my lack of patience after it wouldnt trun back on) anyways, it literaly shut off in my hand without reason. ive lost my photos and videos that have sentimental value to me. is there any way to retreave data from the memory attached onto the mother board?

[@VamptoristicOne]

+VamptoristicOne alson belive me i've done LITERALY everything a person with little to no knowledge can do to it. ive taken it apart, reaplaced parts. ive tried changing batteries, buying new charging port, new charger, new sd and sim card holders, no sd card. it was after all these attempts that i did admitingly threw it across my room...

[@JonnyFix]

+VamptoristicOne Sorry dude, the only way I know of to retrieve data is to get the phone to turn on again. Sounds like it needs some serious work.

[@Kyle-ji7rn]

what power supply were you using to charge the battery and to try and power the phone directly? or just the type that i need to buy woudl be great. thanks

[@JonnyFix]

+Kyle Caudill Any laboratory power supply with adjustable current limit will do the job.

[@Electrolab28Ag]

How do you check those small capacitor and know for sure that they are good or bad? What is the capacitance etc.

[@JonnyFix]

A capacitor should have high resistance. If you have negative meter probe on ground (any metal shield) you can use positive probe on each side to test. If meter has a low resistance beep function this is handy as you can quickly touch on each one and only one side should beep. Keep in mind if you get a beep on both it might not be that cap is bad but something on the same circuit pulling it to ground. The actual capacitance isn't important until you're replacing it, then you need some reference. Main rail caps are often in groups of same value so you can measure one of the others and use same value, will probably be fine.

[@Electrolab28Ag]

Ok Thanks.

[@forme6660]

hello my friend I need to adjust main PBA Samsung S4 I9505..Do you have ???

[@abdumka]

great video, I have a weird problem with my S4 i9500, I changed the screen couple of months ago and after that I started noticing that the coverage sometimes is lost, other times the coverage bars are full, but I can't receive or make calls and no 3G or EDGE connection. I fix it by twisting the phone a little bit, or pressing hard on the back. I opened it multiple times checked the antenna cable but with no luck. do you have any advice for me ?

[@JonnyFix]

+abdumka take the back off, you will see small gold springy contacts that touch spots on the back. Make sure these aren't squashed down so they can't make contact, if so you should be able to pull them up gently. Also clean them and the back contacts with alcohol as oil/dirt from your fingers may have got on them. Also the thin blue coax (seen running down the side of phone at 2:56) is critical. You need to be careful not to damage the connector on each end or the socket it goes in to. They are very small so it's easy to do, usually when you're trying to put it back on.

[@abdumka]

thank you so much johnny, after a lot of trail and error I found out that the problem is with the frequency IC, I found out that when I apply pressure above the SIM and under the 2 copper contacts the phone finds network, at the beginning I thought its the sim card reader, I almost bought one, but then I discovered that the pressure has to be on the IC below it. I;m not sure I can replace it myself

[@normanalbanis5345]

hi mate , where are you based ?, I have a Galaxy 4 has done exactly the same to me, need repair ASAP...please advise thanks

[@JonnyFix]

New Zealand. I don't take mail in jobs sorry.

[@tomgt007sugden]

love love the video . great work in such adversity can you show how you reattach to the components many thanks Tom

[@JonnyFix]

Thanks! Will keep that in mind for the next one I do.

[@monsterinkorporated]

excellent video!! i have an s4 that wont charge or power on. ive done all i can but with no success. Are you able to have a look if i cover shipping?

[@JonnyFix]

I'm not set up to receive items, sorry.

[@monsterinkorporated]

not sure what that means exactly, but thanks for your reply.

[@khamsinn]

if you find wich line is the shorted why didn't connect the voltage there. you removed the second and third capacitor totaly unnecessarily, why didn't you check that line is shorted or not? if you would use freezer spry and connect the voltage(4,2v that line is the vsys) to the first capacitor wich you removed you would have found the shorted capacitor in just few second.

[@mariagraziafrancia1891]

Hi Jonny, great video! Can you, please, help me? My phone randomly turned off and now is completely dead. The last time that I turned it on I noticed that when I connected the charger the telephone didn't charge. After that It turned off definitely. (I controlled charger and battery and they are ok) . If I press the power button It begins to overheat the part near the camera. I brought it to a center and they said that I need to change the motherboard. I know that sometimes they don't really change it but just repair it. So, in your opinion, this problem could depend on a specific part of the motherboard that I could try to repair "with my own hands"? Thanks a lot for your help!

[@soyandersonsilva]

+Maria Grazia Francia The problem may be the POWER IC.

[@diegotorrealba7230]

Where did you find the datasheets of the parts?? or the circuit map?? Thanks in advance!!

[@spidertiger1979]

Iv'e got a Samsung Galaxy S4 GT-I9505 it turns on makes the turning on sound but no display ive taken the battery out and held the power button ect any ideas?

[@atroise]

Nice video! I have a Galaxy it turn on, but the touch screen stopped working it first was faulty when I press the screen would work. However now has stopped forever.

[@vamos85]

I have an S4 active and stumbled across this video. I believe I damaged a drive of some sort. Its a 6 pin small gray component (1 of 5) near the ribbon cable for the LCD. Is that something that is repairable? Or should I look for a new Logic board?

[@JonnyFix]

+vamos85 Unless you are able to take this part from another board then a complete board is your only option.

[@BGPHDModZz]

Hello, on my S4 GT - I9505 Got a similar problem, it shuts off like 3 seconds after boot, tried another battery and cant factory reset either because it just shuts off or freezes whilst recovery is booting, same with download mode :( any suggestions?

[@JonnyFix]

+Placid / SeductiveModding.com Wild guess here, maybe corrupt memory chip, so every time it writes to or reads from a bad location it freaks out.

[@BGPHDModZz]

How would that be because how it started was one morning it just turned it self off whilst in my pocket then the problem started from there? how do i check if its a corrupt memory chip?

[@philv5063]

Hi and thanks for a very informative video.Maybe you might be able to help me with my problem.I have a GS4 I9505,great phone until the last few days.I get a "sim card not detected" or 'insert sim card" message.It seems the only way to overcome this is to turn off the phone for about 10 mins then power it up again then it is ok.Would a motherboard replacement fix the problem?

[@JonnyFix]

Yes because you're effectively replacing everything. It makes me wonder if there's a problem with one of the power rails relating to the sim or if the switch inside the sim slot has a bad connection.

[@philv5063]

would it just require a clean or the sim reader replaced

[@JonnyFix]

Thinking about it, probably not a bad connection if 10mins off fixes it. I'd be looking for bad power rail initially.

[@addyoung01]

I'm having problem with my S4, It has a completely new battery and I changed the motherboard in an effort to fix the problem, Which it did. Now I have a seperate issue whereas my phone wont turn on. It begins to recognise when I plug it the charger in but then the screen goes blank. Same happens when I try and turn it on. It will be vibrating quite a lot but not getting past opening samsung screen. I am unable to boot into Safe mode or Recovery mode, it seems to go to a blank screen before it gets that far. Im convinced its a hardware issue. What would you recommend replacing? The daughterboard? It was working fine directly after the motherboard change so im confused as whats happened now.. Any help would be appreciated! Thanks

[@JonnyFix]

Hard to know. Vibrate is software controlled and I doubt a corrupt software would cause that to vibrate a lot so I'm thinking liquid damage? Power is getting to places it shouldn't. Multiple hardware failures would be unusual without a common cause like that. Maybe something else causing power supply to become unstable.

[@JulioGhigi]

Hey, could you please help me??? I have a sansug s4 mini, and it hapens like with you, randomly turns off followed by not turning on and being unresponsive, and I opened it but I don't feel nothing hot, i foun some capacitors like 0 resistence, could be on this? Pleaaaase help me!!

[@JonnyFix]

+Julio Ghigiarelli Majeau Caps should not be 0 ohm. It wouldn't work at all is this were the case, you have likely measured inductors, they come in a similar package. I would be checking the battery first.

[@heathermisko7386]

Hello - I have a galaxy s4 that fell from my windshield mount in my car. It only fell about a foot or less and it restarted itself. Once it came back on it got stuck on the Verizon screen and no matter what I've done it won't go past it to boot up completely. I've tried everything i know to do. I sent it into a company who told me I needed a chip off recovery to get my data off of it. Before I sent it in i tried a factory reset, which i know wipes the phone clean but that the data can still be recovered since it hasn't been written over. My question is, is a chip off recovery how you would fix this? Can it in fact be recovered even though I did the reset? any info you can share with me would be greatly appreciated! Thank you so much!

[@MrConrado0009]

yeah i'm in the same boat =( my phone just died and they assessed saying the motherboard died?? The phone was in perfect order then suddenly decided not to charge. I'm only concerned about photos and videos i've taken this year on my holidays. I'm hoping to just retrieve the data that won't cost me an arm & a leg...

[@oreirraslm]

I have a problem on my S4. When I unlock the phone from standby It freezes and blacks out (shut-off). To turn on the device, I need to plug in the charger.

[@JonnyFix]

Lester Arriero Maybe try another battery, otherwise it could be a software glitch. Try a complete factory reset. You will lose all data on it. If this happened after being dropped/got wet/something obvious, then that could be the cause.

[@oreirraslm]

Thank you! I will try that and update you later.

[@oreirraslm]

the hard reset works. But, still have a problem that i forgot to mention: the wifi and bluetooth won't turn on.

[@fwd105]

My phone died last week and I sent it to the insurance, they called back to say it was a motherboard issue and would need to wipe the memory in order to fix it... I assume it's possible to fix without wiping the memory, please let me know. Also where are you based?

[@JonnyFix]

Depends why it died. If the memory chip(s) died and the only way to fix it is replace that chip then you will lose everything. If their only way to fix it is replace the entire board and thus claiming wiped memory as they would need to in order for you to know it didn't come from someone elses phone then maybe your board is repairable by a more advanced workshop. I am in NZ.

[@fwd105]

Jonny Fix thank you, I've just got it back today. Will take it to a shop in the local area.

[@fwd105]

Jonny Fix do you know any companies which do what you do in the UK

[@JonnyFix]

I don't sorry.

[@rhn2352]

Could you help me please?! I was on my phone, it just went black and never turned back on. We went to best buy and Tech Shell, and they could only get green flashing lights. We put a fully charged battery in, and still get nothing. it only vibrated once. Tech Shell said that it's the logic board. My biggest thing though is that my baby's pictures are on this phone. Drop box was full and stopped storing in April, and I had my baby in June. So 4 months worth of pictures GONE! I have never felt so sick. I will do anything to get them back! Could you help me? or point me in the right direction?

[@MrConrado0009]

+rhn2352 yeah i'm in the same boat =( my phone just died and they assessed saying the motherboard died??

[@JonnyFix]

+rhn2352 Could be a number of things, you should look around for a board level repairer near you. It may cost a bit but depends on the value of the data I guess. Sorry.

[@MrConrado0009]

Do i search for "local board repair"?

[@citygazerscole]

Hi Jonny. I have an s4 with near identical symptoms. Its beyond my ability. You can have the phone, I'll send it to you, if you get it going, all just want is the pictures. I have half a dozen spare working motherboards you can also have for spares. I'm in Sydney. Thanks.

[@JonnyFix]

Hey Stephen thanks for the offer but I am not set up to receive items via post.

[@citygazerscole]

Jonny Fix thanks no problem. Where are you located approximately?

[@JonnyFix]

New Zealand

[@4amuhammadillyassabinmusad611]

May i ask something? Why my s4 keeps overheating but i just played in about 5 minutes. The overheating felt like you bake a cookie. Im dying. Is it because my version is lollipop or maybe there is issue in my phone? Pls reply ASAP

[@edenloraine23]

Hi. I have the same problem with my phone. Actually it's been a year after it stopped working. It just shut down and when I turn it on, it will vibrate and then shut down again. It's not responding to the charger too. I tried to bring it to a phone repair shop but they said the problem is the mother board and it will cost too much. I decided to buy a new phone but I wonder if it can still work if I try this video. Is it still possible to fix it now? I'm afraid the phone repair shop tampered my phone's motherboard 😔

[@JonnyFix]

+kitty meow It is unlikely the problem with your phone will be the same as this one. If the phone is behaving the same way as when you took it to the shop they probably didn't tamper with it at all.

[@edenloraine23]

I can't turn it on at all after I took it from the repair shop. Considering the battery may be drained since it won't charge when plugged in.

[@edenloraine23]

On the day it shut down unexpectedly, it still vibrates when i turn it on and the samsung logo appears but it will die again. The battery was running low but it won't respond to the charger. So I couldn't really tell how i'm going to reboot it with the uncharged battery.

[@HT-bq8qq]

hi John,have the same problem...u in nz????

[@rjvijay1946]

Hi Jonny, I am using Samsung Galaxy S4 LTE, its showing me No Simcard, Emergency Calls Only Error, we tried changing simcard slot but it dint work. how to troubleshoot the problem and Fix It...

[@JonnyFix]

I would search Google until I found the service manual then follow the steps. If the hardware checks out maybe the phone is blacklisted.

[@zaydabbas1609]

I broke a gs4 and have another dead s4, can i put the broken s4's logic board in the dead one if they have different model number.

[@JonnyFix]

+zayd abbas If the connectors line up and are the same size it's probably worth a shot.

[@zaydabbas1609]

+Jonny Fix i did it and it works perfectly!

[@medmlk1813]

i subscrib on your ch bc i see on comment that you reply for whos asking and that i like it a lot sorry for my bad eng

[@JonnyFix]

Thank you, I appreciate that :)

[@alex993cc1]

man, those little shit components scare me :P

[@tretre7989]

I need my galaxy s4 mini fixed. They can't save my data and the motherboard is damaged and needs replacing...it'll cost $200 for repair....any recommendations????

[@JonnyFix]

Unless the repair can save your data that is more than the phone is worth sadly.

[@tretre7989]

@@JonnyFix thanks for your response

[@JayCras]

Thanks for the video. Well done. *Also thanks for the service manual. I had no idea they existed. Any ideas on where their might be similar doc for HTC phones?

[@JonnyFix]

James Craswell Thanks. I don't have specific sources of service manuals, I start with google which usually leads to forums where they are shared.

[@raszamataz46]

great work love it

[@mulderyin]

may I ask you how should I replace the battery connector of the mother board?

[@JonnyFix]

Mulder Yin I guess you have a new connector so a couple of ways, 1 -use hot air to melt the solder and lift off old connector, 2- use solder wick to soak up as much as you can (put some fresh solder on each connection first) then gently start lifting from one end as you heat the nearest pad working your way along as they lift off, 3 - blob a lot of solder between each connection so eventually you join them all together so the heat can melt them all at once then lift off and clean up excess, 4 - cut away the plastic so each contact becomes separate then desolder each one. Probably 1, 3 or 4 in that order if you can until one of them works. Any method that puts some physical strain on the pads risks lifting them off the board. Good luck.

[@bentad1]

Hi, if the motherboard works with Sprint and i'm with AT&T. Do i have to unlock the S4?tks

[@JonnyFix]

Put your sim in and try it. If it doesnt, there are ways to unlock phones, none of which I am familiar with.

[@DjTSstar]

hi i have the same provlem with fwd105 ! i cant open the phone i see only the logo of samsung galaxy s4 ! they told me that probably the problem is on ram of the phone and i need my phones who are saved inside the phone ! they say to me that if i touch the ram 2 choices are gonna happent ! or your phone wont open again or it will work for 1 week only ! can you tell me something that i can do in order to take the phones ? pls :( its about 1500 phones and i dont save them to ssd or something :(

[@JonnyFix]

Sorry, don't know how you can recover your photos unless they were saved to SSD card you can take out and put in a computer to read them off. You might be able to get your phone working by doing a factroy reset. While off, hold home - vol up - power. When it turns on release only power. You will see a menu, scroll with vol buttons and use home to select wipe data/factory reset. You will lose all apps and data. If phone still doesn't boot they might be right about the RAM.

[@DjTSstar]

yeah the point its that its dont open even that options ! i just look samsung galaxys4 logo :/ ! and i need my phone numbers that i dont save them anywhere else... theres anything i can do with RAM in order to make it work at least for 10 minutes ?

[@melissabryan8936]

Hey my gs4 will not turn the charging port is not working so i was charging it with raw power and it is not ciming on niw what should i do

[@peterdawson6223]

Peter Dawson After being accidentally dunked in salt water for about a minute my Galaxy S4 appeared to be dead. I immediately took the back off and took out the battery, sd & sim cards and dried it out as much as possible. About 24 hours later it was still dead, so I went online and followed instructions I found to submerge the phone in 99.8% isopropyl alcohol for 2 hours and then dry it out as much as possible and leave it overnight to dry. The next day I charged it with the damaged battery and the screen came on but I had no sound. I tried it with a newer battery but nothing changed. I then decided to submerge it again in a fresh bath of the alcohol and left it for two hours shaking it gently from time to time to help the dissolve any remaining salt. I then left it outside in the sun for a little while and then left it for overnight in a sealed plastic container full of uncooked rice. I then left it to charge (again with the old battery) and this morning sound had returned and, after re installing my SD card and Sim card, I could use the internet, take and view my photos, listen to my music library, connect to wifi & bluetooth and connect to 'location'. The only thing I can't do is connect to my phone provider. Hence no phone calls or text messages! I have tried using my wife's sim card but the problem remains. Any ideas on what else I might do?

[@JonnyFix]

Check the sim slot contacts are completely clean. There is also a switch at the back of the slot that tells phone a card is inserted so if this isn't functioning/dirty it might not try to read the card as it thinks there isn't one. Could also be a power issue or other damage to the baseband circuit. Really need microscope with 10x or more zoom to look for damage. It may not be too easy to see where having been cleaned.

[@martinmichalak3938]

I have a GS4 that keeps restarting during the reboot. I tried replacing the battery and the power button with no effect. Sometimes, it locks up instead of restarting. Sometimes, it turns on by itself. Sometimes, it freezes during the bootup process and the screen slowly lights up all yellow. Any ideas?

[@JonnyFix]

+Martin Michalak try without any SD cards installed. Also you could try a hard/factory reset, turning it on with the volume and home buttons to do it. If it has not suffered liquid damage monitor the voltage rails during boot to make sure they are stable. If not that it's a more serious failure.

[@martinmichalak3938]

+Jonny Fix Thank you very much for the reply. I took the motherboard out to see if I could find anything burned out just by inspection. I tried running the phone while it was disassembled and it was much more stable. Booted up all the way. Ran for several minutes without locking up. As I was reassembling it, I tested it at each step. As soon as I snapped the casing back on, it started locking up on the samsung logo again. Disassembled and reassembled a few more times. Same result each time. Frequently boots all the way while disassembled (still crashes after a few minutes). Crashes immediately once the casing is back on. I could be wrong, but the specific part of the casing the causes the rapid crashes seems to be near the volume buttons. Maybe a loose component or something? I looked pretty carefully and didn't see anything. The other thing that affects the crashes is how long the battery has been out of the device. Removing the battery and letting it sit for awhile allows the device to get further into its boot before restarting. Seems like the longer you take the battery out for, the longer it takes to crash. This makes me think it's either a capacitor or a battery problem. No liquid damage, and the sd card is already out.

[@JonnyFix]

+Martin Michalak That is an interesting effect. It is possible the case is slightly flexing the board enough to break a weak solder joint that otherwise connects when apart. Run it apart and very gently flex different areas until it fails. Firmly support the area you don't want to flex to concentrate the movement only where you want it. Finding the exact component will be tricky but if you get the area you could apply some flux then go over it with hot air until all the joints are molten. Hopefully it's not under a large BGA chip.

[@henrique400ah]

Already removed the plate and need to identify the capacitor shorted the Samsung GT I8730 mobile if u can make a video presented is also the wiring diagram I shall be forever grateful

[@JonnyFix]

+Alexandre Henrique To test a capacitor put your meter to ohms and put a probe on each end of it. If it is 0 ohms or very low resistance like

[@henrique400ah]

+Jonny Fix hi johnny, this phone is my wife for more than three years he had been already showing signs that would give problem, I need to access the contact data stored in disposito because I had no backup, the problem of this cell and that he does not care, the electronic technicians only say that the board died and have to change the card, and some videos her and others teach to give short and exchange a ceramic capacitor that is shorted so the cell does not turn on, except I'm not very good in electronics by phone model u could help me? If u have an email that you send the board photos help you? Cellular data Model: GT-i8730 Good evening Jonny

[@JonnyFix]

+Alexandre Henrique I wish I could help but given the complexities of such a device and the lack of documentation it's not something I can do via text.

[@henrique400ah]

INGLÊS good evening I am Brazilian and track your videos have a serious problem with the samsung GT-I8730 he connects not already took in workshops but they condemn the plate and I need recuparar this board po

[@webaruhazberles]

any picture about what you replaced?

[@JonnyFix]

+lori bb Sorry no. I should have pointed that out, not sure why I didn't :/

[@carlmitch3611]

Heay man , maximum respect, nice work. Please, need some advice,my sister Samsung galaxy s4 turns on, receive sound but black screen,glass crack from top left, come down to,right bottom. Could this be the cause.

[@unliving_ball_of_gas]

I don't know why I'm replying to a 4 year old comment, but maybe the screen is broken?

[@jimalbi]

An IR thermal camera would be a good investment...

[@pifi8429]

Hello, what a foolish search. Unfortunately the heating principle was not conclusive. I wanted to know if it was possible to send a motherboard of a mini S4. I can not determine the damaged component. And I wanted to get an idea of the possible price. Can I also know the product you are using? If you have an advertising link of this product that can benefit you, I will not hesitate to order it. As well as may be the clamp or heater component. It is a principle of advertising that pays according to the number of product purchased. Thanks in advance.

[@CitizenSivaopel]

Nice work

[@DavidHernandez-wg2kg]

Hello...My phone was having problems to charge... sometimes it got hot and I had to take off the charger and replug it and works fine again. But now it's not working at all. When I pulg the charger the phone gets really hot extremly hot. I was trying to indentify where it was getting hot And appers to be nearg de power ic. PM8917 in the back I get a little bit lost in your explanation because you did'nt show what did you do to fix it. I'm a litte bit confused i don't know if the solution was removing the capacitor or what... because it did'nt turned on when you tried. and then you start talking about the screenn and magicaly tunr on hehehe.

[@maddyz9976]

the screen needs repair which I maybe can do but the screen holder is also crackedinj the balck bit but phone is working needs a new start button as it works after lightly tapping . It switches on where can I buy i complete assembly as $300 to repair is way over my income THanks . Pardon my termonogy..

[@JonnyFix]

Not knowing where you live I can only suggest ebay or aliexpress. Good luck!

[@maddyz9976]

I did thanks

[@binnchen1000]

can you help me? my galaxy s4 does not read the SIM card . SIM Card Slot I've changed , but that has brought nothing.

[@JonnyFix]

I assume it used to for you? If you bought it in this state are you sure it just isn't network locked, or even have a blacklisted IMEI..... Need to rule those out before suspecting the hardware.

[@iqrakhalid689]

i dropped my phone and its screen broke then i took it to a repair shop then its screen was fixed but then it stopped working but when i put it on charge its screen flashes twice but no response what to do plz help

[@WilliamBrandonLeopardhtliven]

is there anyway to power on the s4 without a battery to see if it powers on before I buy battery???

[@JonnyFix]

Connect a power supply set to 4 volts as seen at 9:44. Do not get polarity wrong.

[@WilliamBrandonLeopardhtliven]

Jonny Fix thanks man you the best!!!

[@thenewgamerr]

please help i have a black screen i can turn my s4 on and the touch screen works and the sound aswell ony the screen doesn't work

[@thenewgamerr]

Frizohn what should i do

[@JonnyFix]

Frizohn sounds like you need a new screen.

[@rahmathbashasyed3780]

my frnd GUOSE BASHA got s4 mobile but that was broken and he was fix mobile new display and also touch but its work just 10 minits .but suddenly putoff .never switch on whats problem ?

[@kinjalmistry6187]

Jonny Fix My S4 is dead.. first they said their IC problem. it wasnt charging. Battery n everything is good. Now its dead. Now they say i have to replace the motherboard. it ll cost 3200Rs

[@JonnyFix]

That's about $70 here and at best about half the value of the phone. Still might be a viable option.

[@crimsomglory]

i johnny! i've a s4 i9505 completely dead. no water damage, simply dead.when i connect it to my power supply, i've 0.5 amp. i've tried to change the ic charger but the phone is still dead and give me 0.5 amp. the phone is not hot when i power on it. could you help me? sorry for my bad english sincerly

[@JonnyFix]

Ruben Camilleri Was the 0.5amp draw present before you changed charger IC? If not, maybe something was damaged during that process. If that current draw is when the phone is off and you haven't pressed power button then that is a lot for a phone in the off state. Something will be getting warm that should point you to the fault. Check to see if there is voltage on each inductor, this will tell you if the phone is "on" and trying to function or if the 0.5A is caused by a fault. Can't remember if it was the S3 or S4 but one of them was famous for a failing ROM or RAM chip that would stop it booting up.

[@crimsomglory]

+Jonny Fix thanks for your reply! The draw Was present even before changing the ic. The current draw is when the phone is off but even if i press the power Button i have always 0.5amp!

[@JonnyFix]

Ruben Camilleri Given it happens when off I'd say you have a low resistance to ground somewhere. Leave the power on and if you can't feel what is getting warm spray some alcohol onto the board and see where it evaporates from the fastest and try pinpoint which part it is then remove that, test it, see what happens. Good luck.

[@crimsomglory]

Jonny Fix when you say "Leave the power on " what do you mean? connect the phone to the power supply, push the power button or hold power button?

[@JonnyFix]

Ruben Camilleri Leave power supply connected and on. No point pushing phone power as for now that's dead.

[@cathys465]

Why didn't you simply replace the whole board with a new one right off? They're pretty cheap on eBay

[@JonnyFix]

Trying to show people how to repair stuff

[@adammentor9564]

My s4 turns on when I plug the battery in...the Samsung logo shows up for 3 seconds and then shuts ....I was told the motherboard is dead .. is there any way to fix that ? thank you

[@JonnyFix]

+adam mentor I guess it's possible. I presume the battery is fully charged and it also shuts off when charger is connected? Also try without any SD cards installed. Last ditch attempt before blaming hardware, you could try a hard/factory reset. Lots of sites that explain the steps, turning it on with the volume and home buttons to do it.

[@pepegutierrez8725]

I dropped my galaxy s4 and it won't turn on can you fix it or help ??

[@JonnyFix]

+pepe gutierrez Sorry Pepe, not much I can do from here. Could be any number of things, likely a physical damage from the impact.

[@musicfan5026]

Thank you

[@JonnyFix]

+Serviser Mobitela You're welcome :)

[@FlorencSinanaj]

Hello and congrats for the video, really impressive! My S4 won't work with the lcd, I mean it turns on but only black screen. I went to a repairing shop and he tested with another screen but nothing. Now I guess the problem might be the FPC but he won't change that because he needs money first and I am not willing to pay for something I'm not quite sure what is. Any help will be welcomed. Thanks

[@JonnyFix]

Florenc Sinanaj That's possible, does it look physically damaged? If not, with the board positioned so the connector is on the right (as at 13:30) you will see 5 large square parts on the left side and a row of smaller parts underneath partially covered by my thumb. The first of the smaller, on the left, should have 3V on one end while phone is turned on. If not there is a problem with power IC or its connections. If so, the next small part to the right should have 1.8V on one end. These 2 voltages power the screen. If not there's something more serious going on and may only be fixable with parts from a donor board. There's some more voltages to check if these 2 are present but hard to describe here, google around for the service manual, good luck!

[@msteryosa4239]

hi jonny fix, so my problem is when ive changed my phone back camera using my mum old s4, when i turned on my phone all i can see is a black screen, and the small dot on the right hand side is blinking. And i try switching the motherboards and my mum motherboard is working properly on my phone and it isnt black screen.

[@JonnyFix]

So your S4 was working. You put the camera from your mums S4 into yours and now no image, but your mums motherboard works on your screen, so your screen is ok. I would first try with camera removed. If that works there could be a slight difference between models so you can't use that camera. If you still have a black screen you have likely damaged the connector the screen plugs on to or maybe damaged or broken off some tiny components beside it when you were disconnecting things.

[@msteryosa4239]

Jonny Fix yeah, i put the camera back on my mums phone then try to turn it on but my screen is still the same, so what should i do then? should i buy a new motherboard (i dont know where can i buy a motherboard )???plss help me. my mother doesnt know yet that my phone isnt working

[@JonnyFix]

Oww that sucks. Would be easier to buy a complete phone and they're old now so shouldn't be too expensive. Make sure you see it working in person and put your sim in to test a call before paying. Good luck!

[@msteryosa4239]

Jonny Fix there's a guy here on youtube said that i might have damage a connector to my mother board , do you think it can still repair by soldering?

[@JonnyFix]

If the connector has lifted off the pads then yes. If it is broken then no. The tiny gold pins have to sit in the perfect place to make good connection. There is also a chance a small part has been broken off the board when you removed the connector. Have a look at this picture and make sure the parts shown around the connector are still on your board and not damaged. photobucket.com/gallery/user/d-Artigo/media/cGF0aDovc2Ftc3VuZ2d0LWk5NTA1ZGlzcGxheXByb2JsZW1fenBzODk2YWE3MGIuanBn/?ref=

[@StefTechSurfer]

Sounds Aussie, I have a similar issue with my S4, just displayed purple lines in 2017 and turned off for years.

[@JonnyFix]

Kiwi ;)

[@hendraliang3672]

can you fix my s4 i9505 dead while i used......?please...

[@matheworgil3083]

if a terminal pin broken can foil paper can repair it

[@JonnyFix]

I'll say yes but it will need to have enough structure to be functional and NOT touch anything else metal beside it. Use caution :)

[@matheworgil3083]

Jonny Fix thnkz it worked

[@matheworgil3083]

Jonny Fix like&subscribe

[@mirbuf]

Mine randomly reboots after a few minutes. When battery is out for a day it can be stable for 3-4 minutes, then hangs, and resets. I tried different batteries, all charged to 100%. When the phone is cold and 1 day without battery, it can even charge it up to 100% without any problem. When turned on and rebooting after a while, it isn't hot (just lightly percepible with finger touch, but was more or less the same temperature felt during normal operativity). I was able to put stock firmware without any failures (keeping phone in a fridge bag), let it rest, and did factory reset. The initial configuration setup is quite long, requiring more than 3-4 minutes, so I was able to complete it in a few days (as it remembers choices during screen paging). I don't know what could be the cause: not the power unit (it won't charge batteries, and in this case charging takes hours without any fault), not the eMMC rom (it wouldn't write stock rom). When it hangs, after a while some black lines appear on the screen before resetting. GPU problem? I'm clueless :(

[@zzzzzz...9902]

Are you a hardware engineer?

[@JonnyFix]

No. I think that would be fun though. However, I lack the imagination to think up something to make. Trying to repair items is a pretty decent challenge at times and you get to figure out how it was made in order to work out where it has failed. There's an aspect of reverse engineering that comes into it, especially when you can't get schematics.

[@zzzzzz...9902]

Agreed. I think that would be fun. You sure seemed like you were one, xd.

[@RSdani]

Help me my S4 black screen problem phone start and touch also work but screen show nothing.

[@douaemziryahi5493]

OOOOOMMMMMMGGGG .. SAAAAAMEEEEE😭😭😭😭😭😭😭😭😭😭😭

[@technicalFunms]

yah i like it information in this video ........................???

[@24cata24]

hy jonny , help me diagnose a note edge that is shuting down with battery left say 35% , 28 % once at 70% ,sometimes it reboots , sometimes shuts down and wont power on unless reatach the battery or plug charging cable and when it power on it has the same battery juice or a little less. what i tested so far is... at the back where the power supply would be there are some capacitors that get extremely hot when the phone shuts down , water evaporates instantly on them ,another thing if i put my ear close to them i hear hissing noise, if the battery is at 4 volts ..if i put a load on the phone 100%load, the battery shows strange voltages measured with multimeter drops all way down to 3.2 volts and the phone shuts of and wont star again unless remove the battery. if i short for a second + and - of the battery while the phone is running it shuts down and wont power on unless i reatach the battery same symptom , so i think when the phone is under load or when takin pictures with flash something shorts on the phone thus the strange noise on the back. long story short , the phone works fine until 40% - 20% battery left is cold as ice but when randomly shuts down gets really hot on those capacitors

[@JonnyFix]

Capacitors shouldn't get hot. If the heat is coming from them not something near by then take them off and see how phone behaves. If it works better you might be able to leave them off or replace them if you can find the value. Sounds like they are dumping power from the battery so when it gets to lower % there's not enough power available to run the phone AND the faulty caps. If you short + and - (you should never do this) the batteries internal protection will basically turn the battery off until a charge is applied to the terminals again.

[@venkateshsamadri9780]

samsung g355 charging % low when charger connected

[@sherifahifny]

Hello I have a big problem with my phone Samsung galaxy S4 19500, it doesn't turn on at all even when I changed the battery it doesn't turn on , I think the problem is in the motherboard but I'm not really sure.. all I want is the data that on the internal storage. Please help me

[@JonnyFix]

If you plug in the charger does it show the battery charging icon? If it does then you should check the power button, you might be able to turn it on by briefly joining the connections together with a wire or tweezers as it may have a bad switch. If it doesn't show the icon it is a more serious problem.

[@sarahotcouture]

I have the same problem I think, can you fix my phone?

[@sarahotcouture]

+Sara Di Salvo i HAVE TRIED TO REPLACE CHARGE PORT, SCREEN, BUT i THINK IT MIGHT BE THIS PROBLEM

[@JonnyFix]

+Sara Di Salvo I cannot do this work for you. Hopefully you can obtain the tools to give it a go.

[@zainwiz4138]

bro if you have any spare board of samsung s4 then plz send me i need it badly ..

[@Knightonlinevideos]

hi, i came across this video, the phone that i am trying to fix as a familiar issue, but i am not to sure if its the ic chip, i have noticed 2 things, i will start with the first in the service manual (www.lcd-television-repair.com/newsletter/Samsung-S4.pdf) for the board it says that if the phone does not turn on u have to search for the C665 and C664 ,i pluged the battary and when checking the voltage on C664 it is showing the voltage of the battery (around 3.8+-) when checking the C665 it shows 0 voltage, does it mean the ic is not functioning or just the ceramic chip is bad? this was the first question, second question, i have removed the power switch after that i was checking the pads, the ground and the right side of the pad which is connected to R1009 they do not have a continuity btw them heres a pic of what i meant image.prntscr.com/image/cd20e513b4604b5b9945c14bc89850e6.png, to be clear what i mean, i took the multimeter set it to continuity and check the 2 pads they needed to make a sound , but no sound was made , what could be here the problem?

[@JonnyFix]

If I understand it right when you push the power button it will connect ground to the other pad to pull the voltage on that pad low to tell the power IC to turn on so with no switch there should be no sound. If 0V on C665, remove power and check resistance to ground on each side of that cap. One will be ground, the other should be very high. If there's a low resistance on that line that may be why there's no voltage. The flow chart says >1V but schematic below says 1.0 so hard to know if ok to have 3.8 there or not. Those flow charts assume everything else around it is ok, no liquid or drop damage etc. If low resistance on C665 you could use a bench supply to put 1V on there and see what gets hot. Just make sure you don't connect to the ground side ;) Alternatively just remove that cap and see if low resistance goes away.

[@Knightonlinevideos]

thanks for replying :) when i pushed the power button nothing happened no signal when i put the battery or plug it into the charger, i've been watching this video kzbin.info/www/bejne/aJ3CZ5mtr9p8raM where he shows that in a normal button the ground and the right side of the button should have a continuity , but in my case there were none. i checked the continuity on these pads when no battery was attached. (i have removed the power switch and checked right on the pads) here a more cleared pic i.imgur.com/FGCfntw.jpg? so i just checked the resistance on C665 with the multimeter set on mode 2k , one side start at 1.2k but then drop to 0.24 (240 ish) and the other side is 0 what do u think i should do?

[@rohanboswell5408]

did u remember u couldn't feel the heat u said u used your lip

[@katxoxo1050]

My Samsung is fried and it will not turn on at all !!!!!!!!! And my Samsung Galaxy s4 active has a crack on it to .. and a lot of people are saying my phone is Fried 😐

[@JonnyFix]

Ow that's no good. Hope you can find a way to make it work again and haven't lost any important data!

[@RishithaSandaruwan]

very good vedio

[@JonnyFix]

Cheers!

[@lolo-gv3nl]

Hey nice video liked and sub and can you help me my blu studio g plus was giving me a system iu missing tried to flash and port keeps ejecting so i leave to phone for 1 week pack down and now it wont turn on,charge no signs of power but when i put it to charge and put the battery in the gold points sparks meaning it is getting power. the phone is completly dead and wont even hear a connection sound when plugged in to pc and i got a vcom 10error code in device manager. i bridge kcolo to gnd with a wire on 4 mm in diameter and it wont be reconized dont know it is the size of the wire and it i half of a feet long.my main board has the gold contacts named kcolo and kol1 and 2 gnd points please help me i need to fix this thanks in advance

[@JonnyFix]

+shandev indoi I'm afraid that sounds too complicated to fix over the internet

[@sssports9125]

my samsung j2 mobli have a dropped into water. and my kid played with the moble.for about half an hour.when i had seen d mbl it is dead. i then removed the battery and kept aside. aftr 1 hr when i attachd the battery the flash light on and the moble vibrated. again i remived the bttry and kept in d rice bag. bt d nect day it didnot work. wil my mbl works ad before. pls sugest me somethg. to make my phne work

[@JonnyFix]

It will need to be opened and cleaned. There are will be corrosion and likely under metal shields that need hot air to remove them. You might be able to brush away the worst of it with a soft brush and alcohol but it's likely from my experience capacitors will be damaged/shorted and there may be corrosion under some parts you can't clean. If you have never worked with electronics I don't recommend you start with this, unless you're willing to take the chance, you should send it to an expert.

[@sssports9125]

+Jonny Fix tq

[@sssports9125]

+Santosh Santu i wil send it to d servic center. 1 bought d mbl only just 1 mnth ago

[@shahidbabu92]

hi...how i know mobile IC information....CAN U HALP

[@geniohc9638]

my phone is dead can you help me?

[@zizodigga]

My samsung galaxy s4 mini shuts down everytime. a blue screen appears then it shuts down

[@JonnyFix]

Try a factory reset that wipes everything. If that fails it's probably a non repairable hardware fault.

[@NEPALI-NINJA]

Hey, could you please repair my broken dead Xiaomi Mobile phone? I have a lot of important data and I want it back, I want someone who can fix motherboard instead of replacing motherboard with a new one. I would like to know if you repair motherboards of mobile.

[@JonnyFix]

Sorry I am not currently accepting mail in work.

[@mustafaal_shrapy3204]

شكرا لكم ،،، حلووو

[@wayakmskhout9618]

thinks

[@rubel5134]

nice dc power supply

[@JonnyFix]

It's ok. Digital adjustment would be better as with age it's getting harder to set stable voltage without maintenance work. Also, I do need a current source >3A some times.

[@mamungazi7081]

plzz help my phone hettin galaxy s4...plzz help

[@madasikaratarak7760]

After trying almost all available solutions , i have not found yet a solution. History. I have tried too many custom roms... Two weeks ago I started trying new custom kernels. After last kernel I tried ( dont remember name) , so smartphone did not work properly and then immediately I used Odin Mobile Pro to install the official Samsung Rom . The phone started fine , HOWEVER it cannot connect to PC (usb problem "PC does not recognise source" ..however it is charged) , it has not IMEI (null) , WIFI closes automatically closes when i open it, internet access unavailable and finally SIM is not recognised. I can only use BLUETOOTH and this only in connection to PC. So it remains a usable phoneONLY as a game machine playing games i have already preinstalled in the SD. I didREAD in a post of yous that there is a custom recovery zippable via the stock recovery. I tried Philz...along TWRP/CWM ... but nothing.. Everytime i faced a E: Footer wrong..unavailable etc messages. Please. Any solution is welcome. Because I am near a month without a phone.

[@JonnyFix]

This is why I will not install a custom ROM. I have no experience doing this or trying to fix one that went bad. Maybe someone at forum.gsmhosting.com or xda-developers.com can help.

[@megamanfan157]

I really want to repair my motherboard for my s4 mini please help so I won't have to lose all my favorite and family pictures

[@daleepkumar5479]

Hello Jonny Fix, Could you fix my Xiaomi Mi4i please, I threw my mobile yesterday and now it's dead, my screen got damaged, also I want to recover all my data from mobile, could you please repair my mobile instead of replacing motherboard, my data is very important to me