Vizio vp422hdtv10a won't turn on

[tom66]

Re: Vizio vp422hdtv10a won't turn on

^correction above, "separate transistors"

Looks like Y-sus is bad then.

[eagle00799]

Re: Vizio vp422hdtv10a won't turn on

So do I assume the buffers are ok? I hate to replace the Ysus just to have it blow again cause the buffers are bad.

[eagle00799]

Re: Vizio vp422hdtv10a won't turn on

And they say to replace both Ysus and Xsus at the same time but I think the Xsus is ok.

[tom66]

Re: Vizio vp422hdtv10a won't turn on

This set doesn't chain ER circuits, so you do not need to do that.

[eagle00799]

Re: Vizio vp422hdtv10a won't turn on

Ok Tom thanks for all your help I sure appreciate it, I ordered a used Ysus from ebay and i'll let you know the outcome.

[eagle00799]

Re: Vizio vp422hdtv10a won't turn on

Ok I got a used Ysus off ebay and the voltage on VSC is -188.7v , when I power it on I get nothing on the screen. When I check voltages on the pins that go into the buffer board the first 2 pins on the first connecter CN5003 I get -35.4v and the third pin is a continuous MV reading, all other pins read -160.4v and CN5002 and CN5001 are all -160.4v. Any suggestions what to look at next?

[eagle00799]

Re: Vizio vp422hdtv10a won't turn on

I unplugged the buffer board and checked pin voltages, the first 2 go from a negative -35.4v to a positive 22.4v with the 3rd pin doing the same with a continuous moving MV reading ,all other pins read -115.5v

[eagle00799]

Re: Vizio vp422hdtv10a won't turn on

Anybody have any idea's if the buffer is bad or is there another problem or something else to check?

[thorvauld]

Re: Vizio vp422hdtv10a won't turn on

Have you checked the Y buffer to see if its grounding,from + to - at the plug from the Y main.