LG 60PA550-UG (No Video/Audio)

[mouuse25]

Here is my old post to set the scene up to the point where I'm at now
https://www.badcaps.net/forum/showthread.php?t=51702

I finally have the set priming and i'm getting a vsc and vy reading that stay consistent...how ever the vsc in reading 140 and it should be 180 and the vy is reading 180 and it should be -150....what can cause this?

[Nick's Tvs]

Re: LG 60PA550-UG (No Video/Audio)

Remind me exactly what the part numbers are on both the Z, the Y sustains and the buffer boards.
Have you tried replacing the logic board?
What if you have everything plugged in properly except for the ribbon cable that connect the y to the logic? Still getting fluctuation?

[mouuse25]

Re: LG 60PA550-UG (No Video/Audio)

Y-sus: EBR73712701
Z-sus: EBR73733601
UP-buff:EBR73710601
LO-buff EBR73731801

I did replace the logic board with a used one from ebay..said it was good but idk how to test it

If I leave everything plugged in except the logic to y-sus ribbon cable nothing happens I hear the power supply click but I get zero reading at the vsc or vy test points

[WeadroW]

Re: LG 60PA550-UG (No Video/Audio)

Mouuse25,
Your Tv is having the exact same issues as mine. Did you see any difference when you replaced the control board or did the new ysus board you installed make the voltage stabilize? I'm getting stable voltages with each buffer by themselves, but when both are connected, then VSC is unstable.

[Nick's Tvs]

Re: LG 60PA550-UG (No Video/Audio)

I am very sorry but at this point I honestly would need to be in front of the tv my self to run tests.
If I were you I would contact the owner of the following listing
http://www.ebay.com/itm/LG-60-TV-60P...gAAOSwNSxU04Mf
and ask him a few questions since he has this exact set to test his parts and honestly you can get the Y-sustain and both buffers for under $50 I would probably just go ahead and get all three and relace them at the same time. Fastpartsnmore is his username I believe and he has all parts available for this model.

[mouuse25]

Re: LG 60PA550-UG (No Video/Audio)

Thanks Nick's Tvs you have been very helpful all your advice has been greatly appreciated, I have ordered many parts from fastpartsnmore they are a great company to work with and I did end up replacing all 3 boards at once with no change to my results

WeadroW I know the exact problem you are having and all I can say is that changing my y-sus or the logic board does nothing different...does your set prime with each board connected individually?