LG 32LC56, picture lost after ~20 mins

[Xenon-Codex]

It starts normally, then the picture goes off after 15-20 minutes, but the backlight stays on. Sometimes the screen blinks and/or shows garbage first. After a couple of minutes cooling, it works again until warming up. Sometimes the picture comes briefly back.
PSU capacitors are changed, none of them were bulged but I changed them anyway. Voltages on the mainboard are ok, 5V on the ERR-pin. Only 12V is 11,5V even when the tv works.

[dick_barton]

Re: LG 32LC56, picture lost after ~20 mins

When the picture goes off can you blow cold air onto the circuit boards to try and find which area needs cooling to bring it back to life.

[Xenon-Codex]

Re: LG 32LC56, picture lost after ~20 mins

Cold spray don't affect. I even bypassed the coils L918, the other 902, 903, 904, 905, 906 and 908 are already removed.
https://www.plcforum.it/f/topic/1028...%A0-in-sandby/

[dick_barton]

Re: LG 32LC56, picture lost after ~20 mins

Do you still have sound when the picture goes off?

[Xenon-Codex]

Re: LG 32LC56, picture lost after ~20 mins

This is weird, it goes on forever when using Scart1. After 1h 45 mins I changed to HDMI1, picture and sound went off immediately. Then I pulled the plug and after short break, TV works normally but only if Scart1 is used.

[freakaftr8]

Re: LG 32LC56, picture lost after ~20 mins

If this board uses a separate HDMI codec processor it madly either be bad, or bad voltage to it.

[dick_barton]

Re: LG 32LC56, picture lost after ~20 mins

Check that your HDMI socket(s) is firmly soldered to the circuit board as others have had problems where the metal shield has worked loose.

[Xenon-Codex]

Re: LG 32LC56, picture lost after ~20 mins

I changed C970 on the mainboard, it has worked 3 hours so far.
https://www.badcaps.net/forum/showthread.php?t=49101