Vizio vp50 hdtv20a no pic just sound

[Swright]

Here it is, new to site and any help will help!
Was watching tv last night and picture went out, I have sound but no vizio logo luminated on the bottom of tv. Took the back panel off, and all I found is one bad cap 680uf 25v on the sus board. Will just that cause the problem? Any help will be greatly appreciated.

[1beertap]

Re: Vizio vp50 hdtv20a no pic just sound

Your problem seems similar to the tv I just fixed. I replaced the same cap that was on the Ysus board but the real problem was a burnt buffer chip on the upper board. Try to look closely at these for a small burned hole on top and/or unplug the tv and wait a few minutes, then take the buffer boards out to test them for a short. There is a video on YouTube on how to test for shorted buffers.

[capkid]

Re: Vizio vp50 hdtv20a no pic just sound

A bad cap is not a common cause of "no picture" failure on these TVs. The IPMs under the large heat sinks tend to fail. Also, there could be other damage. Do you have any pics?

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

As soon as I can I will sent pics. Not at home right know. Thanks for the info.

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Ok here are some pics.

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

This is one of the boards with a bad cap note the screw driver it is a 680uf 25v already removed also the post won't let me attach more than one pic at a time. Sorry for all the added post.

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Power board

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Logic main

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Y-main

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Y-main, I just found another blown cap, it's the same size as the other one on the x-main

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Yb-upper

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Yb-lower

[capkid]

Re: Vizio vp50 hdtv20a no pic just sound

Ok, I thought your vp50 was the version that has LG components, but it's got Samsung components instead. So, there are no IPMs - that's a good thing. How do your buffer chips look? Any burns or holes? You'll have to examine them closely, as the holes could be the size of a pin.

BTW, you should be able to click "Go Advanced" then "Manage Attachments" to upload your pics to a single post.

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Logic buffer-e

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Logic buffer-f

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Last pic I think!

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

I tried that and it would only save one pic at a time. Don't know if its because I'm using my I pad. The chips look good I can't find any burnt spots or holes in any of them. Just the bad caps so far on the y and x boards

[capkid]

Re: Vizio vp50 hdtv20a no pic just sound

Ok. Are any of the fuses blown on the X-main or Y-main?

[Swright]

Re: Vizio vp50 hdtv20a no pic just sound

Nope all are good

[capkid]

Re: Vizio vp50 hdtv20a no pic just sound

Ok. The next thing I'd do is check the voltage outputs on the power supply to make sure they're within spec. Specifically, since everything is working but the pic in your case, I'd check the VS and VA output. You'll need to disconnect the Y-main and X-main from the power supply to (1) avoid doing further damage to them and (2) to isolate the power supply.

VS and VA voltage reqs. should be listed on the panel.