vizio p50 hdtv20a half screen pic if problem attached

[superdad2013]

hello, I have a Visio p50 HDTV20A and the bottom half of picture is yellow red with pink lines floating is my tv shot?? or can I replace a board of some sort?? any help would be amazing.

[cliff_hootarski]

Re: vizio p50 hdtv20a half screen pic if problem attached

I'm going with lower Y buffer board.

[superdad2013]

Re: vizio p50 hdtv20a half screen pic if problem attached

for certain??

[cliff_hootarski]

Re: vizio p50 hdtv20a half screen pic if problem attached

Just saying, if it were mine, that's the board I would replace.

[martyparish]

Re: vizio p50 hdtv20a half screen pic if problem attached

You should be able to test the buffers for shorts. This article deals with samsung but I would imagine the procedure is same. Pictures will help you get more assistance.

[martyparish]

Re: vizio p50 hdtv20a half screen pic if problem attached

Sorry, forgot the link:

http://blog.coppelltvrepair.com/2010...er-boards.html

And here is a video:

https://www.youtube.com/watch?v=51SZsfH60EY

[tom66]

Re: vizio p50 hdtv20a half screen pic if problem attached

I'm going to disagree. The picture doesn't go crazy at exactly half of the screen. Probably the upper buffer -- one lower IC failed -- meaning the chained signal is getting lost for the rest.

[cliff_hootarski]

Re: vizio p50 hdtv20a half screen pic if problem attached

Now that you mention it, I do see it's not exactly half the screen, and I would agree with your diagnosis.

[BoJaXz]

Re: vizio p50 hdtv20a half screen pic if problem attached

i have the p50 hdtv20a. one of the buffer chips on the upper buffer board was noticeably burnt out, but i couldn't see anything wrong with the ysus board. i replaced the bad buffer chip, now the tv powers on, but only the top 1/4 of the picture comes on. ideas?

[tom66]

Re: vizio p50 hdtv20a half screen pic if problem attached

Could be other buffer chips bad. The signal between each is chained, so if one goes bad the signal can get lost.

[BoJaXz]

Re: vizio p50 hdtv20a half screen pic if problem attached

There are 4 buffer chips per board, and 2 boards. since the top 1/4 of the screen shows picture, i'm guessing the top 2 are working, but something with the lower 2 aren't chaining the signal correctly? and since they aren't chaining, they also cause the lower buffer board to malfunction?

[BoJaXz]

Re: vizio p50 hdtv20a half screen pic if problem attached

i replaced the 2nd buffer chip on the top board, the tv wouldn't show a picture at all previously, but now it does, but only the top 1/4 of the screen.

[tom66]

Re: vizio p50 hdtv20a half screen pic if problem attached

What I'm saying is it's possible that there are additional chips that are failed. In this case I'd look at replacing either the second or third chip, most likely third, from the top.

[BoJaXz]

Re: vizio p50 hdtv20a half screen pic if problem attached

i replaced the second from the top, and that's when i got a picture at the top of the screen, but nothing else. i'm trying to check for shorts, i'm not finding any.

[BoJaXz]

Re: vizio p50 hdtv20a half screen pic if problem attached

can't find any shorts, so i guess i can try just replacing that 3rd one and see what happens. any inicators for a bad y board?

[tom66]

Re: vizio p50 hdtv20a half screen pic if problem attached

Check if -Vsc and Vsch are OK. You may only be able to locate -Vsc.