Lg 50pg20-ua

[hogan029]

Hi,

So I am working on this tv , I'm pretty new at this stuff. The picture turned off and all I can hear is sound. So I figured it would be the ysus. I checked all the caps and they look pretty good.

I disconnected the wiring to the logic board and then re connected them again. The tv magically worked again... For about and hour and now I am back at square one again. Would I be safe in thinking that it's the logic board that is causing the issue since I got a picture for a short point of time?

Any input would be appreciated

Thanks guys!

[hogan029]

Re: Lg 50pg20-ua

I have attached some photos to look at.. i just find it so odd that it worked again for about an hour..

[tom66]

Re: Lg 50pg20-ua

OK - on this board: https://www.badcaps.net/forum/attach...7&d=1386118640

Top most connector with silver shielding: unplug
Two small copper holes, just to the bottom right of the "LG" branded processor chip, marked "EXT AUTO GEN", please place a wire jumper across them.

Then turn the TV on. Do you get a sequence of test patterns?

[hogan029]

Re: Lg 50pg20-ua

Do you mean these two?

[tom66]

Re: Lg 50pg20-ua

Yes

[hogan029]

Re: Lg 50pg20-ua

Nothing happened when I did the jump... Any ideas?

[tom66]

Re: Lg 50pg20-ua

Check the VS voltage from the power supply. It's on the connectors going to the two large left hand and right hand boards. You need a digital meter. Expect in the range of 200 V.

[hogan029]

Re: Lg 50pg20-ua

Hey there,
I got 429.. so that would be .. 214ish Volts think there may be some issue here. It was the same on both VS pins.

[tom66]

Re: Lg 50pg20-ua

Make sure your meter is on DC volts, not AC.