LG 42PA4500 Suspected bad main board (double check my logic)

[hardwareguy]

I just want a sanity check here...

Got this TV that has funny noises from the Y sustain board, no picture and no sound. Other than a dimly lit black background, it's dead. I don't even get a standby light. The optical audio terminal doesn't have a red light either, which I find odd.

Vs and Va are happy and I have 5.2 and 17V to the mainboard as well.

If I short the test pattern pads on the panel LVDS interface board and plug the set in, I get some pretty test patterns. Funny noises from Y sustain cease when the patterns are playing, it gives only a very faint hum.

This does indeed confirm the main signal input/processor board is faulty correct?

[sordids999]

Re: LG 42PA4500 Suspected bad main board (double check my logic)

If you get test patterns then it Sounds like a possible main board fault

[ReeceyBurger123]

Re: LG 42PA4500 Suspected bad main board (double check my logic)

Dont think we needed a thread, you've answered your own question plenty of threads like this that prove also. Your mainboard is faulty, likely bga solder issue but if you dont feel confident reflowing replace the board.

[hardwareguy]

Re: LG 42PA4500 Suspected bad main board (double check my logic)

Just confirming here. I don't do many PDP sets at all.