How to diagnose samsung TV that appears to be stuck in a boot loop.

[@FlingwingNZ]

Hi Michael. My goodness you are truly a golden find on YouYube. I live in a small rural town doing tech repair work. I'm sick of throwing out modern TV's because there's no service manuals...I've already fixed two based on the advice you've given in your videos. Many thanks. Your technical knowledge and old skool fault-finding methodology is gold! Terry, New Zealand.

[@michaeldranfield7140]

Glad I have been able to help, sometimes without a service manual finding a fault is just good luck, not technical skill unfortunately.

[@Jucelegario]

​@@michaeldranfield7140 my Samsung 2021 "crystal" tv lasts around 7 to 10 minutes before restarting over and over and only showing the initial logo screen with orange patterns/lines. It needs several hours unplugged from the wall so it can stay on 7 to 10 minutes before the eternal reboot. What could be the problem?

[@jamesbounsall5478]

Hey Terry, can that chip on film be replaced? I am in Kaitaia, so pretty difficult here as well! Thanks james

[@FlingwingNZ]

Hi James. What chip are you wanting to replace? If it's a surface mount component then you'll need a hot air type solder station etc and probably a microscope as well...

[@ultron6931]

Great find to add to this I have a Samsung LN46 that has been through all the bad cap problems on the power board but one day go stuck in the boot loop like this but would eventually stay on after about 20 tries. Turned out it was a few of those yellow tantalum caps on the voltage regulators that power the main board on the 3 volt side. It was a tricky find but after replacing the tv is still working. I know samsung also has a "fault" circuit on the old ccfl back lit models as if a voltage is present it will shut down. Keep up the good work.

[@michaeldranfield7140]

I did a video covering this exact problem on another make of set a few weeks ago, if the decoupling capacitors on the input and output of the 3 terminal regulators dry up the regulator bursts into oscillation, so making a simple voltage measurement is no good as the output voltage will be correct but high frequency oscillations are present on the output which can upset the operation of microcontrollers .

[@likenew6851]

@@michaeldranfield7140 Hi can you provide link to that video? i seem to have a problem like this, would learn a thing or two there :)

[@michaeldranfield7140]

@@likenew6851 Its quite a while ago now so I cant remember exactly which set it was but it was an older set , poss a Grundig if you have a look through my videos .

[@likenew6851]

@@michaeldranfield7140 Thanks i tried searching through your older video, is there any "key words" i should be using for this search?

[@dominoez21]

Thanks for posting. Helped me diagnose. Ultimately found that the issue was a short with one of the connectors. Used the scotch tape method and now it’s fixed!

[@Furoprior971]

how is it fixed ? But you have lost quality or there are traits, right ?

[@paparoysworkshop]

I've just come across this exact same problem on a Samsung 55" TV. I went through the typical tests including taping off some of the lines on those ribbon cables and the TV would do as you have shown in this video. But, further testing (many hours of testing) showed that on the circuit board at the bottom of the screen (the one attached to the screen that runs the width of the screen) has some diode packs. One of these diode packs was getting hot. I removed the device from the circuit board and now the TV works fine. I found two shorts within the diode pack itself. Pins 1 and 10 were shorted and pins 5 and 6 were shorted. Without the schematics (and since I didn't want to try to reverse engineer it) I can only make assumptions on what these diode packs did. Since the TV works without it, I assume it's some sort of back EMF prevention as it also appears to be installed with reverse polarity. But I could be wrong about this. The part number on it is 4268H but I could not find any datasheet for it. It measures about 0.5mm x 2mm. So far, the TV is working without any apparent problems but only time will tell if missing this part will impact something else in the future. At the moment, I'm keeping an eye out for a similar TV for salvage to replace the part with. I hope to put out a video regarding this repair soon. But it's on a very long To-Do list.

[@polishedshoescy]

Sounds about right, can you post some photos of this solution if you got any?

[@karentaveren8865]

Could you somehow send or post a pic of what your diode looks like? I have a 50 inch Samsung that I think had the same problem. But don’t see any diodes.

[@paparoysworkshop]

@@karentaveren8865 I'm not sure how to post a picture via comments, but I will tell you exactly where to look. At the bottom of the screen, there is a circuit board strip, usually split in two. It is permanently attached to the screen. At the end of each strip (not in the center of the screen) you will see two or three very small IC chips grouped together. These are smaller than a grain of rice. They will have 8 or 10 terminals depending on the model. If you don't have any equipment to tell how hot they are getting, just gently touch each one with your finger tip. But be careful because if it is bad, it will get very hot. Carefully remove the bad chip. The TV will work without this chip, but it was put there for a reason so I can't say if removing it will cause other damage later on. You're doing this at your own risk. Remember, they don't look like a typical diode. They are a diode pack of 4 or 5 depending on the model. And smaller than a grain of rice. I hope this helps you.

[@robhardie8310]

@@paparoysworkshop Silly question, but how did you remove the diode - soldering iron and tweezers? or another method please? thanks in advance...

[@paparoysworkshop]

@@robhardie8310 I used a hot air rework station. It's been a year or more and I still have not replaced that diode, and the TV works perfectly.

[@steve83803]

Blimey Michael still repairing then, I used to occasionally pop into your old shop in Buxton town centre. I gave up on TV repairs when LED came out. I remember video recorders first coming out and also witnessed their demise, we are the only generation to see this. Even the “Television” magazine went years ago. Wonder where my stock of PL509 and PY500A valves went 😀

[@michaeldranfield7140]

Yep, still repairing , I was born to repair TV sets , been doing it now for over 40 years , I got rid of the town centre shop after 17 years and moved to a 1700 sq feet industrial unit on the outskirts of town ,people don't go in shops anymore . Still got all my TV valves , I use them mainly now for building valve amplifiers and guess what , I still repair video recorders !!!

[@Vintaginside]

@@michaeldranfield7140 Michael, it would be great if you could also teach us repairs and tricks for video recorders. VHS and Beta are still alive! Thanks for sharing your great knowledge to younger generations: it's unvaluable.

[@michaeldranfield7140]

@@Vintaginside I will keep it in mind for the future , I still repair videos , not seen a betamax though for 30 odd years .

[@austingraves3425]

You sound like me, I started life as a TV engineer in 1956 and retired here in South Africa when the flat screens started to arrive 😊

[@elmarto696]

Thank you, great work! Worked on my Samsung MU617!!

[@rodolfourbaneja5771]

Michael thank you very much for your video, I managed to solve the bootloop of my Samsung Q80R TV. I was hopeless and was counting on losing the TV. The repair cost is very high due to the need to replace the display, as informed by the manufacturer.

[@michaeldranfield7140]

Here in England we have access to new display panels but they are very expensive and no one ever has one fitted , I was quoted over £1500 last week for just a 58 inch panel but the customer could buy a brand new TV for less that that .

[@vornach9303]

Do you have a Connect Box on your 80r?

[@acreativeproduction7936]

What was the fix in yours? I have the same model but boot loop doesn’t play startup sound

[@drokoyeuchestephen276]

You are the best and a genius. I did it and it woeked. Thanks a million

[@michaeldranfield7140]

Many thanks for that .

[@janettinkler2204]

What a brilliant video 👏🏽👏🏽 best I’ve seen on this issue, clever man, keep the great videos coming

[@michaeldranfield7140]

more videos coming but wont always be modern flat panel stuff , I have some vintage TV sets to cover yet .

[@fadedexile]

I'm watching how to repair my 2 year old Samsung on my 12 year old Vizio.

[@michaeldranfield7140]

nothing like an old TV for reliability.

[@Rubberninjas]

I have a Frankenstein 2006 Sansui flat screen with my HDMI converter box that I'm watching this on even has a VCR and DVD player built in

[@mosafares64]

Same goes for women ​@@michaeldranfield7140

[@cristianluchian4907]

Thank You Sire for this tutorial it was of great help to me, I was in a difficult situation

[@michaeldranfield7140]

This is about all you can do without a circuit diagram .

[@JP-xl7md]

Great I’ll just throw mine away and never buy a Samsung again ever!

[@bradleysteeves7891]

Just like my samsung refrigerator. Stove. Washer.. dryer & cell phone s23.. all junk. LG no better

Same here it's Sony from now on... I had 4 of these tvs do this.

[@RanZZbert]

good idea sadly every „smart“ tv companies screw you over

[@ZahidAnsari-ER-91]

Thanks for the video. I am not going to open my TV but now I know what the problem is.

[@michaeldranfield7140]

No problem , many thanks for watching .

[@fgconsolerepairs]

Thanks i was able to fix a Samsung 55" TV by doing this exact thing! I already changed the PSU thinking it was power related but after stumbling across this video all is well now! 2 lines were broken and now the TV stays on!

[@michaeldranfield7140]

I first came across this a few years ago , I had some brand new Samsung sets with cracked screens that were boot looping and at the time I thought it was strange but then I realised they were boot looping because the screen was cracked and not because there was a fault on the main board .

[@lili_91]

Aw man, thanks for the video. I did found the pin at fault and fixed the boot loop, but.. i think i damaged the led panel while opening the tv up, cos it doesnt show anything anymore, but it does turn on now normally. Lol. Time for a new tv, i guess. Cheers!

[@michaeldranfield7140]

You might not have damaged the LCD panel at all, I did a set last week using this method and what happened was I used too thicker plastic which damaged the connector socket , after this it only worked when you pushed down on the connector, so if you use too thick plastic it distorts the socket . .

[@lili_91]

@@michaeldranfield7140 oh, but i used a tiny piece of thin paper, so i don't really know. Will buy a new TV anyways. Thanks for your answer! :)

[@DavidSmith-dm8ew]

Thank you for posting this video, your info was exactly what I needed to diagnose a faulty panned on my 70" samsung tv that failed with the same symptoms. You rock!

[@michaeldranfield7140]

Since this video was posted quite a while ago I have had quite a few samsung sets in all with the same problem so it looks to be a lot more common than I thought.

[@DavidSmith-dm8ew]

@@michaeldranfield7140 I wouldn't suggest anyone buy a samsung tv. They are no good.

[@LTCustomz]

Is there a count of which pins you blocked out in the ribbon? Like how many down from the top?

[@michaeldranfield7140]

@@LTCustomz look for a block of 8-10 pins that seem to all go to the same place .

[@LexLinux]

Great video! thanks for sharing it 😁

[@michaeldranfield7140]

Many thanks for watching.

[@besterspieler2285]

Lmao you saved my a**. I was about to order a new Mainboard since freezing the NAND didnt help. Watching your video I disconnected the Screen and saw the backlight kept on. After reconnecting the screen all was fine again! Just a bad contact probably

[@dominikmayer1]

Thank you very much for this video! With this solution, the TV works again. I found the perfect position for the little plastic strip and it works like before without any problem.

[@sourvenom359]

Hey. Any advice which pins should i shim this way to test it ?

[@dominikmayer1]

@@sourvenom359I don‘t know, I tried several positions and in the end I found the perfect one (by accident) no issues at all anymore.

[@cc_neyo]

​@@dominikmayer1Hey, does your TV still Work Without issued? :)

[@dominikmayer1]

⁠​⁠@@sourvenom359unfortunately no, I have tried several ones, like 10 different positions and luckily I found one with really 0 issues until now

[@dominikmayer1]

@@cc_neyoyes, it still works perfectly :-)

[@michaelgarvey5213]

Love your examples. Where can I locate a repair stand like you use. I love it.

[@michaeldranfield7140]

you would have to make your own now, the distributor I got this from 20 years ago has now closed down .

[@MichaelBeeny]

I hate electronics that talk. It's a worrying trend.

[@michaeldranfield7140]

Can't tell you where the fault is though.!

[@MichaelBeeny]

@@michaeldranfield7140 Now that WOULD be useful, so no chance of that happening.

[@marcellachine5718]

You can just disable the voice.

[@inse001]

@@marcellachine5718 they should have saved the development cost for that feature and invested in panel quality instead

[@NerfAlice]

You all not understanding that we need that stuff blind people watch TV to. They just do it in their own way.

[@GrahamFox]

awesome process of elimination. Followed your process and discovered the same issue with mine

[@michaeldranfield7140]

Many thanks for that ,

[@andythomas7931]

That was brilliant thank you

[@michaeldranfield7140]

no problem , thankyou for watching .

[@xyredmax]

Sadly a sign of the times in this disposable world we live in

[@michaeldranfield7140]

I don't know why screens are so expensive, I know they contain very rare chemicals but these are recoverable from the old panel, we didn't have any problem in the Earley days regunning CRT s at sensible cost.

[@xyredmax]

@@michaeldranfield7140 Yes, I agree. I spent many any hour in awe of Angus at Capital Regun Tubes in Leyton rebuilding CRT's

[@phamduylong]

Hello Michael, where you do get the TV repair stand? I love that tv stand, easy to fix the TV instead of laying flat on the table.

[@wisher21uk]

The panels are rubbish these days I use sellotape to isolate the pins 😊 Thanks Michael

[@michaeldranfield7140]

That was the peel off backing from a set of backlights I fitted earlier, the first thing to hand on the floor.!

[@TheKumra]

Where did you get that amazing TV repair stand?

[@michaeldranfield7140]

Charles Hyde and sons, but they closed down about 5 years ago.

[@johnh7406]

pin 18 from the top of the ribbon cable is the one at least on my tv that was causing it, was able to cover just pin 18 with some scotch tape and it seemed to do the trick, there are a small amount of lines at the top left corner, but they're not that noticeable, you could probably even lift that pin off of the ribbon cable connecter if you really wanted, how I found it was, I did his trick with some scotch tape and kept moving down pin by pin until the tv wouldn’t turn on again, then I moved one pin up and then it would work, so it had to be that pin, which was pin 18, it may be a different pin on yours, but give it a try before you give up on your tv

[@jam_2315]

My 58 inch is one with only one ribbon so u would think easier to find and isolate the pin. Found it tho and it lasted for like 3 days then went out again. Haven't been able to isolate the correct pin or pins again. Inget close and it comes on w sound and picture but after like 1 or 2 mins max screen goes then shuts off. My question is do I need to actually isolate it down to only covering one pin? I might have too many covered. I was covering 3 at a time like another person recommended

[@jam_2315]

I was so close to saving myself several hundred dollars on a new tv lol. Looks unlikely now tho

[@starmc26]

I wonder if you could test with a multi-meter?

[@DrChirath]

Hi Mr. Michael, thank you for your very descriptive instructional video. I managed to find the set of faulty pins and applied scotch tape over them and the boot loop stopped. But I'm afraid to tell you that although the backlight is on, there's no picture to be seen. When I press the buttons, the sounds seem to be in place without any issue. Any way to troubleshoot this problem? Thanks

[@michaeldranfield7140]

Not really without a circuit diagram , only thing I can suggest is check all the LCD bias voltages , if one is missing it could be a leaky MLCC capacitor on the LCD panel or at worst the LCD panel itself .

[@gulfcoastwrestling3748]

Thank you so very much for sharing!

[@michaeldranfield7140]

No problem at all.

[@TheAmazingAhmed]

What an amazing diagnosis! I put the board under the microscope and checked every cap and even injected some small voltage 1v 0.5a down some caps and no shorts were found at all! I think I am having the same problem as you, not sure what that piece that you pointed at name is, but I am sure Its the same one that is causing the problem on mine! Very disappointed with Samsung its a 2021 Neo QLED QN85a 55" inch TV that did it just moment ago while I was watching some friends tv show.. I tried to isolate some parts like you did even before I saw your video to be honest, and it seems like when it turns on and stays on the screen will just stay black and I could see the backlight, and hear my samsung TV plus channels since its still hooked up to my wifi and everything. Any way I can order that faulty piece or is it safe to assume that the whole lcd is toast and that it is the end of the line for mine unfortunately?

[@e1woqf]

Once you've got an image, you should go into the service menu, to svc, to info and then to error counter. On newer sets there is an item " TCON PMIC COUNT". This shows if the bootloop is/was due to a fault in the pmic, which is the power management IC.

[@thor_]

How do you access the service menu on these?

[@e1woqf]

@@thor_ If you don't have a service remote control just use an ordinary infrared Samsung remote control. Connect your TV to the mains, switch it off (standby mode). Then press: info settings mute power The TV will turn on and and it may take a few seconds and the start page of the service menu will pop up.

[@Gamersoft1124Pro]

@@thor_ while your Samsung TV is on Standby press Info + Menu + Mute + Power on, on your remote control. than you are in the service menu. 🙂

[@markpirateuk]

These newer panels are utter crap, as you say, a brand new set is cheaper than a replacement screen. My 74 year old Pye set is still producing a great picture on it's original Mullard tube! So much for progress.......

[@HughTVDX]

Yes, these things are hard pushed to get 74 months of decent service out of. Imagine if your telly could talk.. "No Ally Pally signal found, check your H band 1 aerial connection please"

[@mmwaashumslowww7167]

My Samsung TV is the first led back-lit 40 inch from 2013. Still working as good as the day I got it. No software updates, no Internet connection, just freeview, just as I like it.

[@austingraves3425]

A Pye CTM 1? 😊

[@markpirateuk]

@@austingraves3425 No, a 1948 D18t 9" console set, all wax caps & electrolitics replaced, still on original tube & valves 😁

[@themanieq]

Where did you get that beautiful repair stand from?

[@michaeldranfield7140]

your going to have to make your own , the company I got this from closed down about 6 years ago .

[@RWL2012]

Charles Hyde and Sons

[@mcjjkorus05]

So if you do this and the TV is still stuck in Loop mode just your TV isn't lighting up then that tells you could be the main board?

[@SekharMarneedi]

Yes this is a great trick, very much helpful Thanks Michael. My question is can we keep the plastic paper in? It will not burn out right?

[@samsaverino8159]

Mine does something similar but only the backlight illuminates and there is no logo or sound, it stays on for a few seconds and then goes dark for about 30 seconds to a minute and then repeats the cycle. There has been a one pixel wide vertical line across the tv for over a year too, so do you think this is my problem too?

[@evanmassey7438]

Same issue here. Had 3 horizontal lines that were a pixel wide for quite some time. Tv is now doing exactly as you described. 2021 model Samsung. So frustrating!

[@samsaverino8159]

@@evanmassey7438 yeah idk what to do because I can't afford to replace it.

[@michaeldranfield7140]

Un plug the ribbon cables to the screen , if the set stays on then yes you have the same problem, screen failure on Samsung sets can typically manifest it self at about 18 months old, utter garbage samsung sets.

[@michaeldranfield7140]

@@evanmassey7438 LCD panel failure on Samsung sets is very common and can occur at anything after 18 months old .

[@samsaverino8159]

@@michaeldranfield7140 thank you so much

[@stevehead365]

A not so smart TV. Last thing I want is a TV whinging on about no HDMI connections. Give me a thick TV (monitor). tiny computer, keyboard and mouse and I'm happy. Thanks for the video.

[@michaeldranfield7140]

Not smart at all as you say, and it's a curved set which is just a flat piece of glass sitting in a curved metal back which are prone to cracking down the middle for no reason.

[@mrgittings8355]

Im from the uk and my tv is UE55TU8500UXXU and the fix worked My av board only as one ribbon to the one in the video and also where you put the tape mine was on the right side about 15 or so pins from the end and i only used about 2 to 3 mm of tape also with no lines picture is fine :-)

[@michaeldranfield7140]

interesting , if only there was a circuit diagram so we could actually see what the pins do that make the set work when disconnected.

[@mrgittings8355]

@@michaeldranfield7140 ye we need to find a tv service manual for one of these models because it seems tho most of the latest samsungs have the same problem

[@michaeldranfield7140]

@@mrgittings8355 unfortunately there is no circuit diagrams any longer as your not suppose to do any component level fault finding, the correct procedure is just to replace the whole board that is faulty.

[@sitch9391]

I have taped a couple of pins and it has stopped the reboot loop. The TV now has picture and sound but the picture is faint and white (lacking any colour) do you reckon making the tape smaller will resolve this?

[@michaeldranfield7140]

Its just a matter of trial and error finding the right pins, move along a few pins at at time and see what happens .

[@henryg2840]

I did exactly that and it solved/improved the image

[@PDZsolt]

You have done well this is a clock signal which is tells to the tele to not turn on, if you mask it with kapton tape you can bypass it The line is appeared as maybe you need to cover less legs on the connector, I personally would play with the pin masking to see if it can be better

[@erezschneider3257]

Awesome video! Saved me a lot of debugging time :) I have the same issue and trying to figure whether to scrap it or not. Do you think checking for capacitors shorts on the back of the LCD board should find damaged caps that might explain this? It's gonna be a shame to chuck the whole TV :(

[@michaeldranfield7140]

Theres only 2 things on that board to go faulty, either a shorted MLCC cap of the chip on film which is no replaceable without highly specialized equipment so definatley worth a look before scrapping .

[@johnh7406]

pin 18 from the top of the ribbon cable is the one at least on my tv that was causing it, was able to cover just pin 18 with some scotch tape and it seemed to do the trick, there are a small amount of lines at the top left corner, but they're not that noticeable, you could probably even lift that pin off of the ribbon cable connecter if you really wanted, how I found it was, I did his trick with some scotch tape and kept moving down pin by pin until the tv wouldn’t turn on again, then I moved one pin up and then it would work, so it had to be that pin, which was pin 18, it may be a different pin on yours, but give it a try before you give up on your tv

[@jonahmeier7558]

Nice job John and Michael. I have a un65nu6900fxza Samsung. There are two ribbon cables. I tried the inferior cable. I tried your tape method, first starting with 5 pin width piece, creating a boundry, then a 3 width piece, and then a 1 to wean down and isolate the pin. For me it was the bottom ribbon cable, 19th pin from the bottom. Since isolating one pin rather than a group there is less screen lacing. I still have two small lines horizontally across the screen. 20th pin covered= no power, 18th pin covered= boot then turns off. Tips are to place scotch tape, cut as small as you can width and tear. For counting, use paper and cover gradually pulling down to count because it is hard to eyeball it without losing count.

[@MrJypsye]

Does this model have a tcom board?

[@michaeldranfield7140]

Not a separate one no , the Timing control is on the main board .

[@Canuckster1169]

great vido, im having the same problem, quick question though, I disconnected the ribbon cables and sure enough the tv came on but obviously with no picture. so I unplugged the ribbon cable one at a time, and in each instance the tv came on again with no picture. if we have a problem with the lower portion can it not typically be repaired?

[@michaeldranfield7140]

in short , yes it is possible to repair the LCD panel but you need highly specialised and no doubt mega expensive equipment , have a look on youtube , do a search for COF Bonding to see how the COF chips are replaced .

[@MuhammadJawoad]

Hello, thank you for the video. I have one question which is how you check that the pins are giving off voltage? My samsung tv is quite similar to this one with a built in T-CON board to the smart board. When both strips from the LCD panel are connected the tv turns on with no picture or sound then turns off and cycles again, however when I disconnect one (I tried both), the sound plays but the picture is still not shown. I tried blocking some of the pins but then vertical red lines (some bunched together) appeared and the sound played. I fear the LCD panel is the issue since this happened after using the TV during a lightning storm. Thank you.

[@DJStKittz]

Can I ask where that stand is from? Things bloody genius. I hate having to sprawl big ass tvs across multiple tables

[@michaeldranfield7140]

it came from Charles Hyde and Son but they closed down years ago now .

[@the1Monet]

Do you think I can try this for one side being dark screen with a frozen image of whatever pops up first and other side working nomal?

[@michaeldranfield7140]

Cant guarantee it will work but if your screens faulty anything's worth a try and cheaper than a new screen .

[@monroefixittech]

Hello! Can you advise me on the type of mount you are using to service the TV? I have a small shop and this would be a great addition. You do great work, my friend. Liked + subscribed.

[@michaeldranfield7140]

It came from Charles Hyde many years ago , they have since closed down , easy to make though with a mig welder .

[@RemoveChink]

I had a most puzzling experience with a samsung qe65q60tau. I was experiencing the same boot loop problem and opened it up and tried diagnosing the issue. PSU was fine, all voltages correct. Disconnected the signal cable to the main board, boots up properly like in your video. Reconnecting lead to the bootloop again. I then disconnect one third of the display and it booted properly. However later i disconnected the signal cable again and the boot loop happens now without the display even being attached! I wish i watched this video before i ordered a replacement mainboard...

[@gianlucadonatelli2227]

Hi Michael. Great video, without it I was goin crazy to solve, just ordered a new mb...to try... Following this procedure finally I can see tv on and watch all programs ok. there're some vertical lines on the right side (left watching to TV). At this point, is it possible to repair the chip (s) inside the connectors to panel? Mb Bn41 02568b Kant Model. ✌🏻

[@michaeldranfield7140]

It is possible to repair the LCD panel but I dont know of anyone in England who has the equipment to do this , take a look on youtube for a video on COF replacement .

[@raydal]

Instead of using the popular "tape" fix which takes some guesswork can't a simple JIG with a flat ribbon cable and DIP SWITCHES be used instead? This will save applying and then moving the tape until the bad traces are found.

[@uthayakumar4999]

Had same idea, but using a tape is easier than making a 51/ 96 pin dip switch

[@J-wq9wm]

Thanks for the video, great info, I can't isolate 1 pin only, it's too small, i was able to isolate pins 15,16 and 17, tv stays on now, but no picture, back light and sound working, any idea how to fix this, thank you

[@michaeldranfield7140]

sorry , without a service manual its more guess work than knowing what your doing .

[@markusbrandhuber9043]

3:55 "Moedl" - oh boy...you had one job!

[@michaeldranfield7140]

At least I didn't bug a new main board and find it wasn't the board like one of my other subscribers did!!

[@ralphj4012]

Bit of a longshot / wishful thinking on my part, but could something like a series diode allow the screen to work and prevent the 'feedback' which is causing the reboot issue

[@michaeldranfield7140]

If only there was on the LCD panel, only decoupling capacitors abd the COF chips, vertical lines can only be caused by a duff gate driver chip.

[@raghulokoju8745]

Sir your LED TV testing stand is very good i want this hou to purchase i am India from Telangana state. Mancherial pl reply me

[@michaeldranfield7140]

Unfortunately the company I bought this from 10 years ago has now closed down, they were called Charles Hyde and Son, maybe if I can get some space and time one day I will make one myself.

[@abdsakowa]

I have fully fixed that fault before. I did order a new tuner board which fixed it . And later on found out there was nothing wrong with the existing tuner. It's been a few years now. I like the blocking of some connections on t -con and it proved the TV detects a fault and hence shut down

[@dereinedahinten206]

i hope you can help me i found out that when i pull one of the ribbons out (no matter whether the upper or lower one), the tv starts and there is sound but NO PICTURE. when both ribbons are pluggeg at the same time, the tv turns off/on again. when i cover the upper pins of one of the ribbons, no matter which one, i can plugg in both ribbons, but there is still no picture. what can i do??

[@NickLeeman]

I believe I am having the same situation. Wondering if it's the power board because otherwise I think I'm in the same boat that he's in.

[@Themrbooogeyman1]

Great video - thank you! I just managed to turn my Samsung tv on purely based on this video. The question would be, should I keep the paper patch in? I am assuming it won’t ignite? Also, I have no lines on the tv screen.

[@SekharMarneedi]

@michaeldranfield7140 Yes this is great trick, very much helpful. same question to me as well, can we keep the plastic paper in? It will not burn out right?

[@ardump]

I know this is uploaded 2 years ago and you probably have a low chance of replying but how will I know which part of the pins to isolate at 5:03 of the video? I'm having a similar issue here.

[@RodgerMudd]

Next sets won't turn on because. On screen message reads, "I need a rest today".

[@screen-protector]

It's their typical fault, and yes, most of those models. I've got several of them like that and there's one more to know. They have COFs yes, but they have as well chips on the glass. The COF you can bond, but you won't fix the chip in the glass. This technique what you've shown works, but not all the time. In some of the cases, you end up with completely no picture no matter what you're trying. And, that's it ;).

[@michaeldranfield7140]

at the end of the day though this is just a way of diagnosing the fault , not a cure , a cure would be a new screen but its a way of diagnosing without buying a new main board only to find you have the same problem .

[@screen-protector]

@@michaeldranfield7140 iF there's a COF or driver board fault, you don't need to buy a new screen :). All you have to do is to check all the shorts and voltages which are going to the display like VCC, VDD, AVDD(buck and boost converters), VGH, VGL. At least those. If you can understand than, you can bring back to life many TVs :). On my YT channel/here, I don't show a lot of fixes, but I do show some. My customers most of the time if there's a bigger fault, they just donate, or sell me cheap their TVs. That's why, many faults here end up for spare parts, or, I fix it off the recording in my spare time, and resell them. But, even if you can fix them, some will end up with some 1-pixel lines. It's OK to watch it, but they are and not all customers when see it want them back. So, worth mentioning to them before the fix ;).

[@Scaliofly]

Kann ich nur jeden empfehlen der das Problem hat mit dem bootloop beim Samsung TV egal ob Q LED oder LED funktioniert zu 100%. Mein Fernseher läuft wieder so.. thank you have a nice day i love it.

[@michaeldranfield7140]

many thanks for watching ,

[@Furoprior971]

with lines on the screen ?

[@JesusChrist-sx1lf]

So what you do here when you've grasped a general area of where on the ribbon cable the fault lies, you trim down the plastic bit (use kaptop tape instead) and go pin for pin. You end up with vertical lines because you are blocking more data lines than necessary. You only need to remove the short-circuited pin from the equation nothing else.

[@Furoprior971]

What would be the solution to the problem ?

[@JesusChrist-sx1lf]

@@Furoprior971 Did you not read my comment? I just wrote it. Trim down the plastic as much as you can, block only the short-circuited pins.

[@Furoprior971]

@@JesusChrist-sx1lf yes of course but in fact I wonder if there is a real solution ? because having lines on the screen or a dull image is not really a solution for me

[@JesusChrist-sx1lf]

@@Furoprior971 The solution is the tape trick on the ribbon cable.. You will loose some of the color palette on either right or left side screen but lines will be removed as long as the short circuited pins are the datalines. And in order to minimize the damage, after you've found out where the shorts are you trim the tape so you don't cover unnecessary many pins only those that are needed.

[@Furoprior971]

@@JesusChrist-sx1lf Okay, I'll try that first and see. Anyway, we don't find any spare parts in Qled (QE75Q60R) Thank you very much for your quick response 🙂

[@ownax4]

Hi! I have a Samsung HW-N960 soundbar that is stuck in a loop where I can’t use controls. It’s like stuck in an update. Do you have any idea how to deal with this?

[@JCX..]

So a new main board wouldn't fix your situation?

[@michaeldranfield7140]

No , just scrapped the set .

[@sylvainmichaud2262]

_At Samsung, we're making sure that you don't have to watch our TV with a few lines for the benefit of our own bottom line.™_

[@Darthamiga]

I have a frame 3.0 samsung, does the same thing, when i cool off the heat sink, the tv starts up and works fine for a few minutes, so the main cpu chip overheats and does the endless reboot.... in this video, is there a way to remove the heat sink? can the heat sink be reset, or is it stuck to the chip?? pls do a video, would be fun to see.

[@Darthamiga]

i got a new mb, with the new one boots up into a black screen, put old one in, and it works till it heats up, so i got a new bad mb....what a headache...

[@michaeldranfield7140]

I find now in a lot of sets the heatsinks are glued on , presumably to save money , you could try heat from a hairdryer to soften the glue .

[@Darthamiga]

@@balyemez9489 i added 4 heat sinks to the main heat sink and the exposrd chips, and i tested the tv got 8 hours no reboot...

[@TheThemacuser]

Hey Michael, when I plug my Samsung tv in the back light double flashes every 5 ish seconds and stays at that that’s about it any idea?

[@michaeldranfield7140]

unplug the main board and switch on again , if the backlights now stay on its on the main board , if they still flash its either a psu problem or Highley likely the backlights themselves are faulty .

[@SoB_626]

I just got a similar problem on my 18 month old Samsung Q60A 50 inch TV. A week ago some intermittent horizontal lines appeared at the base of the screen and they just went away after one hour. Today the TV got stuck in a boot loop while watching. I have 30 more months of extended warranty and I will use it, but this is very disappointing. It was on for about ten hours daily on "3 - brightness" and "26 - contrast" so pretty low settings. Do you know any other brand that is more reliable than this? I mean this set didn't even make it past its 2 year standard warranty...

[@michaeldranfield7140]

I dont know of any brand of set that is reliable these days , everything is made as cheap as possible and more often or not fails just out of warranty and then parts are so expensive no one has them repaired or parts are no longer available, of course no one will tell you this when you go to buy a new set .

[@Leprechaun2055]

Got a 70" Samsung TV doing the same thing. Found that if I cover pin 12 on the top ribbon cable the TV will turn on, but 3/4 of the screen has very dull color. If I leave the TV on, disconnect the ribbon to remove the tape, and reconnect the ribbon, the tv reboots and the picture is perfect. If I turn it off and back on, it returns to the same loop and I have to start the process all over.

[@michaeldranfield7140]

Without a service manual its impossible to say what pin 12 does .

[@BoulderHouse]

Same here. While the tv is plugged in I can pull the bottom left ribbon wait for the light to turn on, the sound to become active and then place the ribbon back on and its a perfect picture. My guess is at start up it does a diagnostic and doesn't pass so it reboots again. Taking the ribbon out allows it to not identify a fault and continues to boot open. Once the diagnostic is done I plug in the ribbon and it's game time.

[@dereinedahinten206]

i hope you can help me i found out that when i pull one of the ribbons out (no matter whether the upper or lower one), the tv starts and there is sound but NO PICTURE. when both ribbons are pluggeg at the same time, the tv turns off/on again. when i cover the upper pins of one of the ribbons, no matter which one, i can plugg in both ribbons, but there is still no picture. what can i do?

[@markgarrison9719]

Has anyone figured this issue out yet?

[@Furoprior971]

and why not replace the ribbon with a new one I don't understand ?

[@olivierj.2435]

What do you think about my Samsung UE70TU7175U please ? I have startup sound, backlight ok, no bootloop, light stays on but I have no image or menu. I think it can not be ckv problem because my TV is not rebooting can you confirm that ? Eeprom issue maybe ? Thanks for your help 👍

[@tyronenelson9124]

There's a chance that a boot loop fault could have been bad software on the NAND chip, as I have seen plenty of Samsung Tv's like it.

[@michaeldranfield7140]

Of course yes, I have had a few of the earlier sets with bad nand, just removing the ribbons to the LCD panel will soon confirm if it's main board problem or LCD panel.

[@jjani6138]

I have Samsung TV which was working fine before software update . After software update it was in boot loop mode. I had to pay £60 to reprogram chip.

[@tyronenelson9124]

@@jjani6138 That sounds a little bit suspect to me, it wouldn't surprise me if Samsung themselves were behind that.

[@e1woqf]

Newer TVs can indicate via an error code shown by the LED where the problem lies. Eroor code 2 indicates a panel fault.

[@michaelwaite6725]

Not good for the end user when you tell them the 2 year old tv is scrap .

[@michaeldranfield7140]

Just had 2 vestel Hitachi branded with panel failure that were 2021 models, I advised customers to take them back to Argos and make a complaint.

[@jms019]

Is it too much to ask for these devices to produce unbroken speech ?

[@michaeldranfield7140]

Apparently you can turn off the speech.

[@yousefmelad6424]

I have the same issue in samsung ue55nu6035k stuck in boot loop. When I remove one of two flat cable I hear the sound of start and when I remove another flat cable I hear the sound of start 🤔. I need to know which flat cable and which pins must I covered?? Thanks

[@michaeldranfield7140]

Just a matter of trial and error, try with a small piece of plastic tape and move along a few pins at a time .

[@yousefmelad6424]

@@michaeldranfield7140 Thanks for replying, I will do that

[@gjvd1173]

My samsung tv is about 4 years old and today it started having this problem would it be better to just buy a new one? im quite handy with electronics but if i see a dead pixel on a screen im going insane lol Anyway thanks for this video you teached me some new stuff :)

[@michaeldranfield7140]

No , give it a go before throwing it away as there is nothing to lose .

[@littlebear5219]

Yes it is a crying same but I think it’s the way that the makers of this sort of TV would like it to be hence no service components and manuals and think this put a lot of tv engineers out of a job as I was one of them very sad

[@michaeldranfield7140]

Absolutely right, all done just to sell you a new TV, back in the 80s I use to fit regunned tubes and prices were sensible, now a new LCD panel cost more than the whole TV cost to buy.

[@littlebear5219]

Yes I replaced c.r.t’s in t.v’s data terminals computer monitors- but then It stopped dead because a guarantee given on new monitors Same with tv’s Now the general feeling is it is bad for the environment to scrap items and not repair!! But that was the death nail for the tv repair industry 🥲

[@jonathaneastwood2927]

Same here 30 year career trashed because the things are now so cheap to replace even though ultra unreliable, something needs to be done as the waste now is unsustainable

[@whiteboardexplainers]

What if the problem remains after disconnecting the white stripes?

[@michaeldranfield7140]

LCD panel needs replacing .

[@tvrepairshoputtora7799]

Hi your country

[@michaeldranfield7140]

England

[@yentsaiwang]

I managed to fix the tv by tapng off one of the pins on the flex cable that connects to the two left LCD driver boards. However now there is a horizontal line across the screen. Is this something that can be fixed by covering more pin or there is not much can be done? Thanks

[@michaeldranfield7140]

If its a faulty COF than yes it can be fixed but you would have to find someone with the specialist equipment to do this job, if its a fault within the LCD glass itself then replacement of the panel is the only cure .

[@Blade4four]

Mr. MD: i would like to upload the pin-outs/wiring diagram for the UN65MU800DFXZA family, 49/55/65". i hope you would be able to decipher some of the signals that cause these wacky symptoms, thanks in advance for your expertise.

[@animizio197]

My TV only shows 2 LEDs and boot loops again and again.. nothing on the screen, no sound and no backlights. Do you have any idea what I could try? I cant find this problem on the internet.

[@Can_I_Have_A_Go]

Is there a way to reset this situation? There is no way to enter tv via remote as tv does not reach stage to interact.

[@Carlos-Brown]

Thanks to your video the booting stopped. I even have sound but no picture. I only covered a few PINs but don't have a picture at all. But that probably means I have to get rid of the TV. Correct?

[@mr.nobody8174]

Good old days when a fist 👊 fixed the telly. God times, dont think that works on flat screens. And yea, it did often fix a TV acting up, beating the shit out of it 😄

[@michaeldranfield7140]

true , dry joint and all you needed was a good bang on the top.

[@Brk_Scheffer]

That's exactly what happened with my TV exactly right now, I noticed some dead horizontal lines but actually I didn't care, since I almost never saw them while watching something or playing videogames, that's sucks, a lot of TVs that I had aways ended up having some stupid kind of problem like this

[@michaeldranfield7140]

Not good is it and I'm finding now even never sets only lasting 18 months .

[@Brk_Scheffer]

@@michaeldranfield7140 The most ass part is that the TV is not even 1 year old

[@michaeldranfield7140]

@@Brk_Scheffer I regularly get 18 month old sets needing new LCD panels but no one ever has them repaired due to the cost .

[@Swave93]

​@@michaeldranfield7140 The replacement part is just too expensive. Is there a workaround? I have an 8K neo qled that's stuck on boot loop.

[@michaeldranfield7140]

@@Swave93 only the one in the video but the true cause is the screen thats faulty .

[@tangodigitalsystems]

Sometimes, electronics have their ways of messing with our head, I have the same 55-inch series with yours. Mine will work for 12minutes before going into boot loop, I checked the 2 ribbon connectors one after the other, until I finally replaced the mainboard. I still hope to fix the faulty mainboard because it has Bluetooth but the new board does not.

[@robtitheridge9708]

sutch a shame as the set is now scrap or do you know a way of changing a COF?

[@gazyounglive]

Only way to fix it is a new screen & in the long run is more economical to just but a new set

[@michaeldranfield7140]

Yes the COF is replaceable and by typing in its part number they are for sale on the Internet, but do a search on KZbin and take a look what sort of equipment is needed to replace it, I wouldn't be surprised if it cost more than £20,000 for the machine, I have seen a few KZbin videos of these been repaced.

[@Can_I_Have_A_Go]

I need help with my tv Boot loop issue. A friend showed me the engineer menu. As he was backing out mDe a change we dint know and now looping logo..goes blank logo blank...10 second loop

[@BoulderHouse]

Remove the ribbons from the bottom of the tv while rebooting loop is repeating. This got the audio on but still no picture but when I reconnected the ribbon at the bottom left and tv powered on the full crisp picture came back. I was able to go through and reset everything. But as soon as I turned off tv and turned back on it went back to reboot loop. I'm going to try the paper trick next but otherwise I think it's a main board.

[@patlovell6539]

Hi Team, My Samsung is clicking and won’t turn on. I’ve replaced both the power source and the motherboard and it still is clicking. The clicking only stops when the wifi module is disconnected. Could this module cause my tv to be shorting causing the clicking? Any help would be greatly appreciated!

[@michaeldranfield7140]

Yes , there was a Samsung model of set where the WI FI pcb suffered from an internal short but I cant remember which model it was , the chances is you have a short on the supply rail , I would have a look for short circuit SMD decoupling cap before ordering a new module .

[@Blade4four]

how the heck can you go about uploading these wiring diagrams for the UN65MU...

[@michaeldranfield7140]

There are no circuit diagrams in most service manuals for modern TV sets .

[@ledzeppalan]

Hi Michael, I have a Samsung UN46D6003 tv and can only switch the tv on and off by plugging in and unplugging the power cord. The tv is stuck on one channel, at one volume, can't access any of the menus on the tv, etc. None of the settings can be accessed either with a remote (even with changing the batteries on the remote - I tried using 3 different Samsung remotes, including the remote that came with the tv) or by pressing the 'buttons' on the tv. When the remote buttons are pressed the remote sensor light on the tv flashes rapidly like it's supposed to. I also did the cell phone camera check on the remotes and the 'signal' lights on them work as well. Does anyone know what the problem is an any advice on what part needs to be changed? Thanks.

[@fenflyer]

Loving this TV workshop.... subscribed to your channel 👍 Could you try to diagnose = 2 year old TCL 75C815K 75 Inch QLED 4K Ultra HD Android TV " just out of warranty... This week the TV set automatically updated itself and it installed software update rebooting itself all automatically Perfectly faultless before automatically updating itself but now when scanning digital TV channels via the plugged in antenna port and finding 500 + digital tv & radio channels it won't save them and returns error message signal unavailable 🤦‍♂️ Other TV perfect on same antenna 🤔 Tried 7-8 times rebooting and software update but error message= signal unavailable.... TV was faultless before the software updating 😱

[@michaeldranfield7140]

If the set worked until you received a software update it sounds like software corruption , I dont know the brand TCL so your best bet may be ringing the manufactures first .

[@fenflyer]

@@michaeldranfield7140 👍

[@fenflyer]

@@michaeldranfield7140 TCL tech dept sent me software link , downloaded it on to usb stick ( boot stick) TV reboot itself from USB stick... ALL GOOD now 🤞 Cheers 👍

[@michaeldranfield7140]

@@fenflyer You are very lucky , a lot of manufactures wont supply software .

[@fenflyer]

@@michaeldranfield7140 if you want a copy for your parts repertoire ... I can send 2 U 👍

[@dorfusfrakeldoodle]

My screen doesnt have any lines. Sometimes it worka fine for like 45mins and then it reboots again will stay on for some more time and then eventually the reboots get more frequent till its stuck in a loop again. Is there anything to be done? Its been 3 days

[@Jucelegario]

my Samsung 2021 "crystal" tv lasts around 7 to 10 minutes before restarting over and over and only showing the initial logo screen with orange patterns/lines. It needs several hours unplugged from the wall so it can stay on 7 to 10 minutes before the eternal reboot. What could be the problem?

[@rosewhite2135]

The biggest fault, in my humble opinion, is that monotonous 'robovoice'. I couldn't live with a telly like that, even if it were otherwise working perfectly! So, is that terminal then? Or can it be fixed?

[@michaeldranfield7140]

It could be fixed by fitting a new LCD panel but as a very general guide a new panel would cost about £10 per inch so a 60 inch set would be looking at £600 for the screen plus fitting and no one ever pays this kind of money for a repair .

[@f.k.burnham8491]

I also would love to find out where you obtained the TV repair stand. That's the cat's pajamas!

[@michaeldranfield7140]

It came from Charles Hyde and son , now closed down , but Im planning time permitting to make one myself , may even do a video on it in future !

[@Brar0Saab]

Hii Michael I have the same problem with qled please help

[@Furoprior971]

Hello, have you found a solution since then ?

[@electronicartis]

Is there any possible fix for this TV to work again.

[@michaeldranfield7140]

Yes. It's all ready gone back to the customer.

[@RWL2012]

@@michaeldranfield7140 what was the fix in the end?

[@Thuglas82]

Curious of the same. I have a TV in the same state and curious if there's a cheaper alternative to replacing the panel - which isn't worth the cost.

[@michaeldranfield7140]

Tell the customer it needs a new screen and it's not worth repairing but at least you have more picture than when you brought it in and there's no charge for looking.

[@michaeldranfield7140]

Realistically all you can do is look for a secondhand screen.

[@TheBorda92]

changhin main board fix he problem?