LG 42LN5300 Dead Not power supply

[@WestCoastDP]

I just cover the surrounding area with tin foil. The chip is isolated. put a nickel or quarter on top of the chip for bit of weight and a very small piece of solder on the tin foil next to the chip. Turn on a hair dryer on low or a heat gun on low and heat up until the solder on the foil melts, then heat for 15 sec more. Works every time.

[@82thamonk]

Thanks for the video and tips. Revived my family's dead led tv, Sony KD-55XD7004. Saved me ordering another main board, just used a hot air gun, circling underneath the chip area for about 10min until i could feel the heat through to the chip's 'white' heat spreader. Reminded me of working with bga components some 8+ years back. You know your stuff well. Thanks from Finland 🇫🇮

[@YuddyNguyen]

Did you hear under the board or top where the heat spreader is

[@donadsouza328]

Samsung ld32d,500d

[@sk8erz6721]

Wow, that's all it took. I used my soldering air gun on the chips at 180°F for like a minute and the red standby light came back on. I reassembled and my TV turned on! Friggin amazing. 🙌

[@todddulcich5684]

your a genius.. had same problem with my lg 60'' model 60 LB5900 UV. would not turn on, would unplug many times, then it might come on. it got cold in my game room and problem got worse. heated the XD engine square modules with hair dryer for several minutes.. works like a charm.. thanks!! Todd

[@jnj77]

Thanks for the tip. It worked for my TV, which had similar symptoms. Instead of halogen bulb I used incandescent light of rating 100W for 1hr about 3cm above the board. TV turned on successfully. There were also few white lines on the display, they also got fixed. Happy... :) Thanks for the tip.

[@micanki]

Huge thanks for such detailed, simple and to the point problem solving skills.

[@jasoncandicearcher4946]

You just saved my buying a new TV. Used a heat gun, worked beautifully. Thank you!

[@ludypalacios2889]

How did you do that? Would you mind to explain?

[@MARS-GREENH0USE]

This is the most down to earth thing I've seen. Monday blöwn

[@The_Revealer_7]

How long time did you use the heat gun on the main 2 microprocessors?

[@old64goat]

GREAT information, I am from the old school of not using too much heat on transistors or any solid state devices, I find this amazing that that heat lamp re flowing solder did not destroy those chips. But again like I said I am from the old school, vacuum tubes and some transistor work back in the 60's. Thanks for the great educational video, enjoy your channel.

[@wayneburden5879]

Thank you so much for the tip! I used a hair dryer for just a minute or so and pressed the chips with my finger. Worked like a charm!

[@rayhindle642]

Another great instructional video with intimately detailed commentary, thanks for taking the trouble, hope you get a buzz from doing them for us. Ray H. ( from the U.K. )

[@victorianlover3328]

We actually got this TV from our local waste site. The TV looked like it was clean, it was missing a remote control though. We turned it on and it worked great as a rarely used bedroom TV. I got a remote off Amazon. Then our 65" Samsung back light bar (just one, we think) has gone out. So we brought the LG out. It was solid for 2 days. Then it had all the problems you described. So glad we found you!!! We're going to try this to see if it works. I hope you have a video showing how to replace the backlight bar on my Samsung.

[@dpop1012]

Just wanted to say thanks! My LG 42lk550 is 5 years old and I couldn't find any parts for it, like a mother board. I ended up using my heat gun on level 4 on the dial for about 6 minutes and shazam! It didn't have a picture or sound and now it works. Never knew this trick until I watched your video. Thanks again.

[@garryfischer6094]

Awesome video with deep explanation of what could go wrong and troubleshooting steps, thank you

[@rodneyholshouser4521]

I rebaked at 385 degrees for 10 minutes and 390 for 5 minutes the solder was nice and shinny this bake tv is off and running again thanks again friend

[@frogeye22]

Brilliant. I had no red led light and no power except for pins 2 and 3 showing 3.35V, used a 50w halogen bulb on the big chip "engine" raised about an inch from the board for about an hour. Let it cool for 15 mins then tried it. Working perfect. Thanks a lot from London

[@jene1651]

Thank you! You saved me from buying a new tv. I was all set after removing the back and tightening the screws on the power supply.

[@FELIXORWENJEOKOTH]

Hi Sir. am a junior technician from Kenya , always motivated by your videos. keep up the good work. you are transforming lots of lives. LEGEND👍👊👊

[@ne0tekk1]

Really surprised to hear it wasn't the power supply. I reflowed the solder on my Insignia power supply board when I discovered poor solder joints and it works perfectly now. I'll keep your video in mind if one of my LG tv's fail. Thanks!

[@romarovinciguerra5387]

Excellent video my good sir, I picked up a LG model - 55LS4600-UA at the recyclers today, I opened it up and looked at the capacitors on the power board none were bulged. The issue I was having was the RED Stand By Light would light up. But if you tried turning the TV on, nothing would happen. I used a Wagner Heat Gun for about a minute on the IC101 and IC1201, then after letting it cool, POW! the TV fired up! I'm glad I got it for free though, since i didn't notice the small crack in the screen till i got it to light up. Wish i could fix the screen now, but i guess it would cost too much. Just glad i learned something today :)

[@12voltvids]

+Romaro Vinciguerra Yes you learned about those evil BGA chips.

[@eds6569]

TLDR: very helpful vid. 60" lg plasma w/red standby led no display&sound, ruled out basics/pwr cable/power board (no obv damages/traces/loose connections/bulging or leaky caps, volts/grounds good) hadn't considered reflow (specifically cpu/other chips) will attempt that too. Thank you for additional possibilities. Recently obtained an older lg 60" plasma, TV's are pretty cheap these days and most are not worth the time trying to fix but I miss the picture quality of the old plasmas over most of the newer TV's and enjoy learning different repair techniques especially since I'm an electrician by trade so your video was very informative and to the point on your thinking process and has given me some additional areas of attack.

[@88sCYTHe]

I have a very similar TV, with exactly the same power board. While it was playing it suddenly gave a loud bang and was dead. Other problem than described in this video. Measuring, the first fuse behind the power cord was dead (EL7-EL8, of type 5A 250V). Replaced it, powered it and after a few seconds another bang but this time the first fuse (which I replaced) was still OK so must be another component blown. Any suggestions? Do I dig deeper or do I just replace the whole power board? EDIT: I hadn't fixed the power board properly, learned from this video that they provide ground connection. When properly screwing it back on it powered up just fine. Me happy. My first repair of this kind and found it pretty much myself except for that part with the screws for which this video helped me. Thanks!

[@ronniepirtlejr2606]

Nice find! I'm learning a lot watching you!

[@Electricworld-1]

You are a very good teacher, thank you.

[@Lgncr1]

I had and LG 46 and used your method but using a heat gun for 20 sec about 2" from the chip and it works now!!!. Thanks for taking the time to publish your video.

[@trevneuzerling4708]

I usually put the whole board on alfoil in the oven preheated to 200 degrees Celsius for six and a half minutes then leave oven door open and turned off so bga slowly cools down then take it out after one hour .This slightly melts the dry solder in the ball grid array ,can cover some capacitors with bits of foil so they don't get to 200 degrees but I don't I just take my chances that caps are rated at 205 lol .Mind you I'd never do this for customers or charge people for what's maybe a temporary repair , just for my family and friends free of charge :) I have tried other methods like hot air gun etc but oven provides a more accurate way to melt dry/bad solder .I do this method as it works but there is always risk of damaging the board and or components so please do so at your own risk ... :)

[@12voltvids]

200' is not hot enough to reflow solder, all that does is expand the board slightly, and temporarily fixes the problem. The light bulb fix is the most reliable one I have tried, and I generally only do it on my own equipment.

[@dtwistrewind7361]

After the bga fix hit the sides with thermal adhesive the solder may then get malleable again but the chip can't shift. Great video

[@davepedro9386]

Thank you! 2019 sharp 43” Red standby light won’t turn on. Swapped out power supply no luck. Heat gun for a minute each main board chip did then trick. Hope it lasts

[@int53185]

I've seen videos on youtube of people putting their LG motherboards into a conventional oven for 10 minutes at 380 degrees F. I like your method much better!

[@12voltvids]

+James Last I've seen people do that an melt all the plastic connectors too.

[@int53185]

Stinks up the house too!

[@wayneshephard]

Nice work, my OCD forced me to fast forward the placement of the VT but very informative, good camera too!

[@garrygemmell5676]

I wish i had your ocd my ocd forces me to watch the whole thing lol

[@waynewayne3709]

Short circuiting filter caps that carry high volt will give a flash crack pop.. I've seen damaged parts due to arc over on smd boards. On the other hand it's great that a time serviced engineer takes the time to show the many faults and how to track them down to restore electroinc equipment to working life.

[@lucky5wonder]

Thanks Brotha, you saved me a lot of time and money. I used a heat gun on a Sony 60 inch, used a heat gun, and it worked, been using it for 3 months now. Again Thanks.

[@The_Revealer_7]

How long time did you used the heat gun on the main board?

[@rali5255]

Excellent video for solving TV problem Detailed and to the point Very well, thanks for sharing your problem solving skills

[@KyleSand]

A little flux might make that repair last a bit longer. Hot air rework ststion would be a good tool to have in the shop.

[@konaok1]

Very well done! Can the board be heated from the back with a heat gun and to what temperature? I watched many of the other's showing a bad power supply board and know that is not the 100% given. Thanks again for your thorough step by step instructional video.

[@DubstepHntr5280]

Wow. You're very smart!! I wish I could speak that intelligently! Especially after covid I'm lucky to complete a sentence without getting twitterpated. Thanks so much for a detailed video! You should be a teacher or do some electrical instruction videos online! People would totally pay to watch these and learn what you know!

[@kh3naz]

After narrowing down the issue to the main board I used a heat gun set at 250 celsius, waved it over the large heatsink for 3 minutes then I let it cool down, the TV now works!

[@AlexGSi2000]

Thanks - your video helped me diagnose my LG TV (Followed your tip regarding ground screws - it fired right up after this).

[@rayhindle642]

Thank you so much for taking the trouble to tell us all how you fixed this problem, I enjoyed every bit of this video. I especially liked how you broke it all down to basics and explained in full detail your trouble shooting..........I have just subscribed and I am looking forward to more of your clips. Ray H. From the U.K.

[@joshuamoore24_7]

Neat, trick. My went out in a power surge. Plus I found one some one set next to the dumpster the following day. I just bought my 40" a few months ago. I will try this trick on it.

[@catsanycat]

We really appreciate this info, and are going to try to fix ours. Only other thing is that we've lost our remote control : ( We are thinking we'd just get a universal remote. What do you think?

[@buddyclements1111]

I have used an oven at 325 degrees for about 6 minutes .and it didn't not mess up the connectors but use this fix at your own risk.

[@KorAllRBare]

I actually used a cheap chingy Heat station on a BGA chip a few years back now and the sucker is still going, the trick is getting the temperature just right..

[@pfloydphanatic]

I heard about those Onkyo receiver BGA problems... I bought a new TX-NR818 and put little RAM Heat sinks on all the chips on the HDMI board. And have fans on top of the unit pulling heat out and cool air in from the bottom of the unit. Hopefully will prevent this failure.

[@likewhite8713]

tightening screws wont help.power and main boards will work without being conneced to chassie.only plasma tv boards that use gound screws need tightening

[@rawr51919]

Best to check them anyway and see if they could be the problem somehow. If the board was cracked around the screw area, it may lead to a working unit for a while just by doing so with it.

[@jonka1]

How can you be so sure that you absolutely know how each manufacturer has organised the circuits. Just tighten the screws.

[@carltonreeve2476]

Thanks man. I always enjoy watching your videos as a Technician. Very informative. ..

[@vinztapic4197]

very clear and very detailed troubleshooting and components checking and repair.Thank you for sharing this kind of video...

[@hanspedersen2326]

used an oven for laptop for heating up the graphic chip. It works almost every time :-) i removed the cpu and ram wires etc. oven was heatet up to 200 celcius and the mainbord was in the oven for 20 minutes. while it was in the oven i clean the fan inside and removed the old themal paste ( was hard as an rock anyway ) themal paste i used was arctic mx4 works every time 👍

[@mhossain2677]

Thanks for the insight. I bought a used TV and after bringing it home, it wouldn't turn on. Power board has the standby voltage being transmitted to main board. So I assumed Main Board must have kicked it. I am going to try your method and see if it helps.

[@wrathpsp]

Did it work?

[@paulbieniek]

Great video! I used the same repair on my LG TV (different model, but same concept). I used a regular 100W incandescent bulb in a floor lamp with a metal reflector. I put the lamp directly over the chip in question and left it there for an hour. The TV immediately worked when powered back on. I'm guessing having my TV mounted above the fireplace for 5 years was a bad idea.....

[@icicestlamaisoncalme]

Hello could you send me a link of this bulb, i'm not english i don't understand what it is. Thanks a lot !

[@cyphaborg6598]

let's say you have a TV running and while on the bathroom hear a kind of snapping sound to come back and see the TV is turned off. The soundbar didn't turn off with it while being directly connected to it via ARC and I haven't been able to turn it on since. Power cycling and everything but nada,just by that sound alone is it safe to say this would be a powersupply issue?> I looked at the board but can't see any obvious capacitor bulges.

[@DJ8Uup]

Great Video! I'm try to fix my electric pool vacuum control unit. The wind knocked it over and it won't power up, same a your TV, has a power board and a control board. I guess a hard jolt when the unit is on is not healthy for these boards? Won't power up at all, I did check the ceramic fuse for continuity.

[@Hagfan789]

Great video. Thank you for actually taking the time to explain what you're doing. I have a LG 55LB5900 here only 2 years old that keeps flashing from black to picture steadily. Sound is fine & menus flash as well. Any ideas you have sure would help. Thanks.

[@robprobin9306]

Very helpful thanks. A Lg tv I picked up tonight wasn't turning on so I put the gas heater on and placed the back of the tv 2 feet from the heater 25 minutes and a slight distortion to the back plastic I plugged it in and it turned on . Nice cheap Tv.

[@darkhairboy1]

thanks for the tip.it fixed my TV .I had standby light on my LG but no power.i used a hair dryer to heat the chips though just for a few minutes.

[@ramiroochoa2009]

how many minutes ?

[@jackshepherd6276]

Great tutorial, I'm going to try this with a heat gun and see how it goes. If it works, great. If not, no harm done, it's broke anyway.

[@Seemsayin]

When you're THAT smart, you get away with pronouncing a few words... ya know.... like they're spelled. Excellent video. Wish I knew just half of what you do. Thanks for taking the time to enlighten us.

[@12voltvids]

Seemsayin I pronounce the words using the queens English. Solder is pronounced exactly as I say is. It is not soddor and more than a roof is a ruf as the Americans like to call it.

[@Seemsayin]

12voltvids This Murican has no problem with the Queen's english, nor yours. When you don't hear it every day, it's worth mentioning in the comments section. Glad you handled my ignorance well. You are one sharp cookie.

[@billiemfan]

@@Seemsayin In WV, USA Again is Ah gin not A gane LOL

[@Seemsayin]

@@billiemfan Thanks for the head's up. I'll keep that in mind when I'm in your neck of the woods.

[@billbrowning50]

I’ve watched this twice, and although I have similar problems, I.e. my standby light blinks slowly, the TV doesn’t turn on. If I wait till the blinking stops I usually hit the power button and it turns on. Today however after watching again, I couldn’t get it to turn on. But I started pushing the buttons on the back, channel up, channel down. After hitting the channel down the TV turned on.

[@trevorhare815]

cheers buddy just fixed my 49 inch lg with an hair dryer

[@loucabrattzie9992]

How long did it take with the hair dryer? I'm attempting this now.

[@trevorhare815]

@@loucabrattzie9992 I had it on the highest heat setting and used a metal vacuum tube until u get enough heat x i had to do this 2 times until its worked

[@icicestlamaisoncalme]

Hey I literally used a hair dryer, and the red light came back ! Then when I put the HDMI cable and chose HDMI in the menu it became frozen with lines everywhere. Do you think the power was not enough ? Do you think it could work better with a 300W heat gut ? Because I cannot buy more expansive for now. Thanks !

[@SimonPetrikovy]

Thank you! This fixed my tv! Let's hope it keeps working.

[@saddle1940]

I have had success doing this, but then I put a flat PC video card heatsink and fan on them to stop them warming up excessively. It's the heat and cool cycles that kill these BGA solder joints. The chip heats up but the PCB doesn't.

[@JamesWelchx1]

I've worked on one of these over a year ago same problem. Lead free solder suck. Causes lots of connection problems. BGA chips suck as well.

[@manuels656]

Thank you so much :-) my tv (LG 42lx6500) was also dead. So i looked inside it. Everything seemed perfect. so i looked at the screws and drill them a little bit - aaaaaaaand the tv is working again. It was a Ground-Problem with the screws ... Damn^^ thank u for showing/saying that :-*

[@InDaZone]

I have this TV and started having the exact issue described in your video. Except I think I got lucky. After I took the back off and laid the TV face down, I plugged it in and it turned right on! ... ??? I guess maybe I had a ground issue? I have no clue. But I did tighten all the screws like you suggested at the beginning. Some of the ones on the power board didn’t seem very snug either .... so I’m guessing ground was issue? Who knows. Thanks for the video though.

[@th3guvnor351]

Attempt 3 of fixing my TV here it goes, tested power supply changed capacitors reflowed the solder purchased a new board that came this morning still no good and now ive came across this video il let you know how it goes....... Thanks

[@popaki9484]

How did it go? lol

[@th3guvnor351]

​@@popaki9484 well tbh i accidentally put my foot through the TV haha, I sat there with the heat gun like i was a Nicky Clark doing some ones hair tried again and nothing, :( x

[@popaki9484]

th3 Guvnor haha karate kid style eh lol I hear ya. Sorry to hear.

[@vinztapic4197]

can i use a hair blower in replacement for the halogen lamp?

[@nemesisnowviii4111]

No

[@j.lietka9406]

When the unit is just plugged in, not turned on, should the STBY light stay on? Great video and thanks for the full explanation! 🤓 Nice LG!

[@parajeeper]

On mine, the power surges where the LED’s plug in to the power board. What should I check?

[@robertcabrera3375]

Same. Did you ever figure it out? Going to try heat gun on IC chips. Thinking of buying a capacitor tester as well. TV will work for a few then start blinking out, audio continues. I tried a LED tester and was able to light up LED's but only confirmed through back shield holes.

[@Okie-Tom]

Good diagnostics. One has to use common sense and follow the voltage.

[@tomablankenship6988]

I am sure it was a defective power supply board because it took a while for the sound and video to come on.

[@mtnbikeboy79]

What temperature would you say the chip is seeing at the end of the heat cycle? Depending on what I discover on my same model, I am considering using a heat gun to do what you did. I just don't want to overcook the chip.

[@12voltvids]

+Tim I don't have a thermocouple to measure the temperature as of yet. Once of these days I will invest in one. Hot enough to flow the solder. I usually leave it I=until I see the rosin smoking good. I now use a heat gun, as it is faster. I have had mixed result doing BGA repairs and a few I have had to repeat a few times to get it working. SO don't take the time shown cooking here as a guideline, because times are usually edited down. When I did a few of these it took 10 or more minutes to get the chip hot enough to get a good bond. Saying that, all the devices I have fixed so far are still working, as most are mine.

[@bobskie321]

0:28 That TV has a universal voltage (100 - 240 Volts). How common (or rare) are TVs with universal voltage over there in America? Many American TVs that I saw on KZbin have a voltage rating of 120 volts (not universal 110 - 240 volts) which surprises me because here in the Philippines, most TVs since the late 1980s already have universal voltage (100 - 240 Volts).

[@12voltvids]

Some do, some don't.

[@ramasawmysokanaden4298]

Thank for having answered but now I have another problem with my car equaliser I have cleaned the circuit board with thinner and wait till complete dry but when I put current to it I heard pack sound like a short circuit and no indication is on could you please tell me what to do to fixed it

[@Fardeenfarwest]

Hi thanks a lot for this video. This might help me. To figure out where the problem of mine is coming from. 👍

[@laser-on-off]

Thanks for this video, another interesting repair, and not the common faulty caps in power supply thing. Could you show us a bit more of the halogen lamp you used ? Maybe in another video; it was a close up. Anyway, thanks for videos. Greetings from Paris (Fr).

[@12voltvids]

+Onel s4Yes I was thinking of doing just that. I have a scrap board I can work with that has BGA chips on it. If I leave it on the board long enough I should be able to actually remove the chip.

[@laser-on-off]

+12voltvids That surely would be interesting. I'm hoping to see this, if you can do it. Thanks.

[@Franklinveterinarycenter1of4]

Me too🤔

[@austinthevhsvideogamelover5265]

My Grandma Nellie Has A 2011 Lg LK37 something i dont remember the model number but the tv got struck by lightning all the way back on 4/10/19 at 1:30 AM it turns on blue light comes on but no picture or sound. Butch, a friend of grandma's from Arkansas me and him took it apart on 10/19/19 and i was thinking the inverter board was dead but idk its still sitting in that spare bedroom waiting to be taken to a ship to be looked at i only saw a slightly bulging capacitor on one of the boards.

[@danmackintosh6325]

Hi fella, don't know if this is worthy of note to you but will share all the same. Our LG 42LC46 (2007, owned from new) the last few months started displaying symptoms which pointed towards a main board issue (after running a while, screen was flickering between picture/static on all inputs & on one occasion picture completely went with backlight and sound both still working, controls locked up. However, on inspection it seems (fingers crossed) to have merely been tarnished connections on the cable between sig. and Tcon boards. Time will tell, but heating/cooling/tapping the boards couldn't reproduce the symptoms but touching the connector on the main board did, cleaned connectors and seems better now. Just in case it's any use to you.

[@12voltvids]

I had that on a Sony but it was the tabs between the tcon and the screen.

[@brianksiazek4666]

Dictionary.com shows that the "L" in the word "solder" is silent. Keep up the great videos!

[@12voltvids]

Only if you pronounce it as an America. I am not, I pronounce it the British way with the "l" and since I don't have an accent I pronounce the o as a short vowel, where as a real Brit would pronounce a long o so it would sound more like sold-der. If you are an American you are forgiven. You also pronounce the letter z incorrect. It's "zed" not "zee"! 😁

[@12voltvids]

Well they are wrong. Listen to it here. kzbin.info/www/bejne/e2PXdmyvf9WtiKs Have a nice day!

[@rodneyholshouser4521]

It worked for me until I installed my HDMI and the down again thanks keep up with the great work I enjoyed all of them

[@12voltvids]

Does it work if you connect a device with component cable?

[@rodneyholshouser4521]

It's not powering up stand by light is on

[@basheerkhan6040]

very interesting and informative but please can you let me know if this tv which you cooked in the oven is it still running or packed in again after a few months, do you think that after the heating in the oven,will it last for at least 2 or 3 years. i am very keen to know this.

[@lightshine6044]

When you bake the chip for an hour, was TV standing as normal? In other words, was that PC board standing vertically attached to the tv ? Did you have to press the chip down while it was hot? Thanks

[@12voltvids]

The board was out if the set lying flat.

[@raghuyedatore6353]

Wow! Wow! Wow! What a clever trick! You know your stuff. Thank you for another excellent video with clear instructions.

[@ericreflection3767]

Good video I love adding extra components to those boards running different hardware

[@nor4277]

👍👍never seen that done.before,very cool.repair ,most people would have thrown that tv out,nice save,and I have a little rework station ,I seldom use the heat fan ,except on a kit with smd parts ,which is not favorite kinda of kits,but I figure I should learn .thanks for another great video.

[@12voltvids]

Some day I might get a rework station. Would make life easier but I don't do enough SMD work. I actually cheated on this. I did use the light bulb, but I actually put it much closer than what is shown here. I set the bulb directly onto the ship when I baked it.

[@nor4277]

@@12voltvids ebay 898 D rework station ,its worked very well four me for over 3 years the best 47.00 dollars I ever spent .

[@supremegermalenesilva6710]

Would a hairdryer get to a high enough temperature? I don't have a heat gun or a lamp...had already changed the power supply and no go. The way I see it I should try as I won't lose anything...

[@andrewszombie]

Wow what a simple fix to save a TV! Amazing!

[@wizerbudd6081]

Absolutely well done video 12voltvids ! I have the exact same set.My problem is TV will turn on for split second then nothing, red led stays on hit power button again LG logo for split second then die, red led goes off too. Will try halogen heat lamp with spacers and see what happens.

[@coolfisher1644]

Might be LED's or their power supply

[@MSullivanFREE-BUSINESSES]

Helpful video, thanks, but why not show voltages before and after. Anyone know what the voltage readings are on LED plug, the board says 157VDC for 42", but I am seeing 230VDC on LED+ pin, and this is same with plug connected or not. All other voltages were within range, 3.3, 12, 24 so I replaced board, and must have been bad, for I lost 12, 24VDC, but the LED+ was 115VDC, so got me wondering which is normal for LED power? Any ideas?

[@MSullivanFREE-BUSINESSES]

It would have helped if you showed voltages after heating control board chips to see if they changed. I believe the 3.3 VDC is OK as that is what my voltages were if that helps others.

[@12voltvids]

You likely have an LED that has failed, and thus there is no load to drop the voltage. Like xmas lights, the LEDs are in series so if one goes bad they all go out. Backlight failure is pretty common these days. Most unreliable parts in an LCD TV and most are user caused.NEVER run your TV with the backlights set to max.Always turn them down from the factory setting. I would not run over 75% maximum.Same with plasma sets. They have a cell light setting, and from the factory they are cranked to 10. I generally do not run them beyond 6 or 7.That saved electricity, and produces less heat due to lower current demands, and that will prolong the life of the set.

[@MSullivanFREE-BUSINESSES]

Thanks, if I saw a difference in 230VDC with led plugged in, verses not plugged in, I would agree, but it remains the same which is higher than board says which is 157VDC. I don't remember seeing my issue with dim pulsating screen being an LED short, but I guess anything is possible. I put main board under halogen light as you did just in case, but no difference, so guess I will have to buy another power supply board which is less than LED strips. Will post results hopefully to help others. Thanks, I appreciate fast response.

[@bryanjohnston9879]

Quick question - how many Volts should I be measuring at the LED backlight? I could swear at 11:20 you said 48VDC. I've got 93 VDC constant but all my standby Voltages are correct. I don't have the exact power supply but the main board on my 55LN5400 is the same and all of the PSU connectors are the same.

[@12voltvids]

That depends on how they are connected. 2 48 volt strips in series is 96 volts and 3 of them in series is 288.

[@Metalhead-4life]

I have a BK hot air station. Just curious at What temperature do think would be best and for how long if I wanted to heat up and reflow a bga component? The issue with my TV I think is different, I tested the led+ connectors and I'm getting 74 volts with leds connected to power supply board and only 70 volts when I disconnect the leds from the power supply board. Does this sound like a faulty power supply to you? TV symptoms: backlights keep turning off. If I turn the TV off and back on again the TV works for about an hour then the backlight goes out again. Audio works fine and tcon board looks good (have image with flashlight).

[@jesterraj]

hey i have a LG 42lb5800 tv doin the same all voltages are present....dunno if the main board may be faulty

[@TEMPASFUJIT247]

Quality fix well presented 👍👍👍

[@BrodyErbtv]

D32f-e1 Vizio no power. I put a new power board in and still nothing. I do tv repair and this has me stumped.

[@dianagoodrich7169]

Hello! I also have made "temporary" repairs to different things [not electronic necessarily]. Those repairs may outlast some of the normally functioning components. Thank you! -- DG

[@belkacemdz4656]

En France

[@belkacemdz4656]

En France

[@supercopp6917]

I hava a pioneer sound system. its main chip was showing the same problem. The unit was turning on but getting off after a while. I zeroed the problem to the main board chip. But as usual, I got faulty chips fro ebay twice. lastly the unit went to scrap.

[@ghil3697028]

Think the firmware storage chip is the problem on my Samsung TV but I honestly didn't think at all about reflowing like I once tried on my PS3 motherboard. Gonna give it a try anyways, thanks for the idea.

[@reefgratos2035]

Cool, saved my tv after watching this...i was about to throw my LG 3D TV 47LW5700 away.. my LG was not turning on and power light was blinking,, because its on the wall and heavy. I didn't feel like taking it down and opening it.. after hours of shopping online for a new TV i was pissed and installed an old 22 lcd tv in front of the LG until i can find a good deal..it was a good excuse to buy a new oled tv or something.. i was just pissed to spend 1.5k ..i wasn't prepared.. i couldn't sleep.. anyway. After 8 hours or so I saw this youtube and i had to try this out first before giving up .. i had to open the back panel and every tv is different. The 47LW5700 has all the screws around the perimeter and about 5 screws around the center. Once exposed, i checked the voltage and was reading 3.5v too. So i just went ahead and use a heat gun and an infra red temperature reader.. the two chips were covered by a heat sink.. i did not know how to remove them so i just heated directly over the heat sink layer. About 20-30 sec of heat to reach 200F The heat probably transferred over the chip.. then i allowed cool down,,at first it did not work, then it just started to work again. I was dam happy...woke up the wife (she did not appreciate that) but needed her help to hang the TV on the wall. Started to watch TV for about 20 minute..and bang! TV shutdown by it self and turn it self back on.. was kinda disapointed.. but atleast it works...unhooked the tv from the wall again.. reopened the case and re heated, but this time i heated atleast 10 good minutes at 300F.. reclosed and put it back on the wall.. this time it worked better. No shutdown..2 hours later still no shutdown..3 hours later still going strong,, it looks like the reflow is working this time. However i noticed while closing the rear panel that LG made holes to evacuate the heat through those holes that are right over the two main chips.. so next time i may just heat directly there without opening the panel. But i understand this is not a permanent fix.. but atleast it will give me some time i hope to find the best TV deal...we are only few weeks from blackfriday..

[@GSimon850]

Hi I did the same with a friends PS3, i use liquid flux and used a heat gun to heat the chips up and it worked. dont give a shit if it's not a full time fix it was a favour and it still works today over 12 months, at the end of the day it's working and not in the skip. Thanks again for a fantastic vid dude. Simon

[@WizardsMagic007]

I had that same TV. I replaced the t-con board and only half of the panel was displaying picture. Sadly I could never figure out the problem.

[@12voltvids]

I have seen several LCD sets that I washed my hands on. Of course you don't see those videos. Half a picture is generally the tabs that connect the TCON to the panel.

[@vernonbosshard9317]

Filter caps looks a bit bulgy might wanna replace them. How how hot does it need to be? My standby was 3.3 too, so must be common.