LG TV half of backlight not working

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LG Television

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dany613782 @dany613782

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Опубликовано: 19 сен 2021 г.

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LG TV half of backlight not working

Hi I have an LG 32LB550B and more than half of the backlight has stopped working, it looks like only the top left LED is working, the rest of the TV still works fine and displays images fine. I’ve looked at the power board and main board and don’t see any burn marks or blown capacitors, although I am a noob to electronics so I’m not too sure what to look for. I’m guessing the problem is probably the LED strips themselves, but I th

ought Id post here if anything else was the problem, I’ve added pictures of the TV backlight.

Any advice or suggestions would be appreciated.

Отвечено! Посмотреть ответ У меня та же проблема

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Hi Dany,

I would double check the LED strip connections, on the power board, but most likely you have a dead LED or a whole LED strip. If I'm not mistaken the TV is lit up by two led strips which are not the worst to replace and it can be done by yourself. Have you got photos of the disassembled power and main boards? Have you taken the screen apart too?

23 сен 2021 г. из honakrisi

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oldturkey03 @oldturkey03

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dany613782 this looks like failed LED backlight strips. You will need to replace those. Not a bad job on a panel this size. Of course, you want to measure the voltages on the power board going to the backlight LED are the right voltage. If that voltage varies greatly then the issue would be the power board. This video will definitely be of some help. Post some good images of your boards with your question, that way we can see what you see. Adding images to an existing question

The backlight strips are in the panel so you will have to remove it from your TV and disassemble the panel. Make sure that you mark the diffuser sheets in the proper order and direction. It saves you a boatload of problems later on.

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thanks for your reply ive added in more pictures of the main board and power board they both look fine and I cant see any burn marks, so im guessing its probably the LED's. I would measure the voltages but im a total noob to electronics and not sure where to start.

14 окт 2021 г. из dany613782

dany613782 sounds good. I just did a 32" panel today (Samsung TV) and it is not terribly difficult. Takes about 2 hours (leisurely) to replace those strips.

14 окт 2021 г. из oldturkey03

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Hi Dany,

I would double check the LED strip connections, on the power board, but most likely you have a dead LED or a whole LED strip. If I'm not mistaken the TV is lit up by two led strips which are not the worst to replace and it can be done by yourself. Have you got photos of the disassembled power and main boards? Have you taken the screen apart too? — honakrisi
thanks for your reply ive added in more pictures of the main board and power board they both look fine and I cant see any burn marks, so im guessing its probably the LED's. I would measure the voltages but im a total noob to electronics and not sure where to start. — dany613782
dany613782 sounds good. I just did a 32" panel today (Samsung TV) and it is not terribly difficult. Takes about 2 hours (leisurely) to replace those strips. — oldturkey03

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LG TV half of backlight not working

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