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LG 32LB580V LED LCD backlight problem

Hello!

My TV recently turned off the backlight. Sound works and with the flashlight I can see the picture. I pulled out the power cord, after a few hours I tried again, worked fine, after about 5 minutes the backlight turned off again, the sound is fine and the flashlight test too. I noticed that if I let it be without power cord around 24 hours, the light will work for about 10 or 15 minutes before it turns off. When the light is working then the LED switch has 111.3-114.6 volts, but when it turns off, it is 144.6 volts. I also tried factory reset, not help.

Visually does not see the traces of burning on the power supply. And when the backlight is on, I don't see dark spots on the screen, all the LEDs seem to work.

Can anyone tell me what the problem is?

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Solución Elegida

The inverter that feeds the backlight is going thermal fail. Get a service manual and replace all capacitors 10uF+ on secondary side of backlight inverter. Also, look with a big magnifier for any kind of fractures in the switching transistors, rare but you got to check. This is so common there are vendors of “capacitor kits” by make & model #.

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Thank You for Your answer! But i have maybe dumb question, where is backlight inverter? Is it built in to power supply, or where? Added image to first post, what i see, if i remove back cover.

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Respuesta Más Útil

If LEDs are damaged in backlight it can be repaired without any special tools, but you need to have some experience of assembling/disassembling of LED LCD TV screens. I have go though this video guide and was able to successfully fix my TV backlight issue : https://www.youtube.com/watch?v=6CVT9-Lt...

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Имам lg32lv579s при пускането не тръгва и мига червеният индикатор

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Did you fix ur backlight power issues?

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Actually I tried every day and at one moment it started to work properly. Worked for about half a year and then switched off again. But this time they started to blink, just like a bad connection. While I was still working, however, I noticed dark spots on the screen so some LEDs still didn't work. Anyway, when leds stopped working again, I decided to order new LED strips, replaced them, and now a month and a half have been working properly, no dark spots or turning off. The replacing is not as difficult as it looks, there are videos of it on youtube. Also note that I ordered an LED strips from Aliexpress, cost around $ 10 or $ 15, I don't remember exactly. There was also comment that they are better because they are aluminum, the originals are plastic, so that aluminum conducts heat better. Only that the delivery to Estonia took about 3 weeks. When ordering, see panel number. You can find it by removing the back cover and there is a sticker where it is written. (NC320DUN - VAHS2 or something like that.)

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Hi!

I'm sorry to bother you,I have a same tv(LG 32LB580V) with a same blacklight issues!I just would like to ask some question in private if you accept!?

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i have the same problem i have tried to fix them bt they are just blinking..like there is no current flowing continuasly help me to fix them through this email,,timiepaul@gmail.com

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I was experiencing a backlight problem with my LG 48" flat screen; in desperation I went to settings and changed the backlight to 50%. It seems to be working fine now.

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моля някой да ме насочи каде ми е проблема имам всичките захранване има дежурното захранване от 3.5 волта но при записване само мига червения индикатор

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