Sound but no picture.

Problem is in either power supply or - my bet - the Y-Sustain board.

The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.

Often there are fuses on that board - one or more. Check those.

if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.

often that *needs* to be done in a service center as there are some adjustments to be made after replacement; don't know about this particular TV model, but it's a common thing for the plasma TVs.

Hey mikeoldfield, thanks for the response,but i could use a little more help with Viewsonic vpw425. I see a red lite that comes on which has alarm written next it also 2 green lites where one of them fades out.
Thanks again Cheers