LG 50PK350N does not startup

[PowerAmpFreak]

Hello!
I'm investigating a LG 50PK350N which does not startup. Voltages from PSU seems OK, both lowvoltage and VS and VA.
It does not even give a brief flash of picture (as when the PSU resistors are bad)

Brief measurements on Y-SUS does not reveal any failures. What next?
Could this dude be put on testmode from Logic?

[tw2005]

Re: LG 50PK350N does not startup

probably check out the buffers and see if shorted. It may be possible to fully isolate each buffer and see if you get half a screen. On the 50PK550 I did once I could. Funny thing the bottom buffer was shorted out by a cockroach.

https://www.badcaps.net/forum/showthread.php?t=21677

[tom66]

Re: LG 50PK350N does not startup

Check fuse for Vs/Va tract of power board.. I have a LG 42PQ3000 with same fault.

[PowerAmpFreak]

Re: LG 50PK350N does not startup

All voltages are within spec from PSU. All fuses OK on PSU. All fuses OK on Y-SUS and X-MAIN.
BUT, the led "D1" on logic board does not light or flash.
Power seems to enter logic board, IC's get warm.
Still, could it be put in testmode?

[PowerAmpFreak]

Re: LG 50PK350N does not startup

Howdy boys!
Is there any pattern generating testmode available in these sets, like shorting a jumper?

[tom66]

Re: LG 50PK350N does not startup

Yes, jumper pins EXT AUTO GEN on CTRL board with LVDS cable removed.