Vizio VP50 HDTV20A - Sound, but no picture

[Steve31086]

Hi all - I've been searching around the existing topics for this TV, and I've made some headway, but am now unsure how to proceed.

I'm working on a VP50 HDTV20A with all Samsung parts. Basically the TV has sound, but no picture on any input. Not even a backlight on the screen.

After removing the upper y buffer, I have backlight and sound on the lower half of the screen, but no picture. If I remove just the lower y buffer, there is no change from the original problem.

Should I just replace the upper y buffer and call it a day? Or will that not fix this issue? Is there some other underlying issue that I need to take care of as well?

Thanks in advance...

[tw2005]

Re: Vizio VP50 HDTV20A - Sound, but no picture

just had a quick look at Shopjimmy for this model. yeah that generation of Samsung, top buffer and y main. Y main may have survived but on the 2 or 3 I played with a bank of FETs , 88N30W get shorted, fairly cheap and easy to replace if that's all.

You could have trouble getting an Upper buffer or quite expensive as they all seem to fail there so hard to find. 2007/8 era.

[tw2005]

Re: Vizio VP50 HDTV20A - Sound, but no picture

Tom66 video with similar panel.

https://www.youtube.com/watch?v=25HT...tCVe9&index=13

[Steve31086]

Re: Vizio VP50 HDTV20A - Sound, but no picture

Thanks TW2005 -

Any idea how I would go about testing that Y-main? Image attached for reference...