I have a 42" Toshiba Plasma that has sound but no picture?

not sure if this link will help you out but have a look. Toshiba Regza 42 Black Screen Google Search

Replace digital board. Common for this set.

try replaced z board Manufacturer Toshiba Part Number 75003032 Description ZSUS PCB ASSY

It sounds to me like you have a tuner issue, I have seen this before. If you have a good picture from other sources and they have the same antenna input, the tuner is suspect.

I hope that this helps you solve your issue.
Thanks
asnowman

check the setting of the TV.

TV was on, screen went black... Stanley cup playoffs double OT continued sound only. TV now just clicks on and off. 

See if you can center the picture in the setup menu. It sounds like it's just off center.

my 42" ilo plasma started going black on the outside to middle, now its totally black and no sound the power indicated lites for a min then the tv shuts off

First thing to check is if the back lighting has just failed... Power the set on and looking across the screen can you see a shadow of a picture happening? You might even use a flashlight to shine directly at the screen while you look at it from an angle.
Bill

Similar problem with my Toshiba. I was told it was the power supply and that it would cost about $900 to replace parts and labor