We have a widescreen plasma (Panasonic TY ST05-K). The picture all of the sudden shrunk to about 3/4 of the screen. Fortunately, the picture is not cut-off, so you can see the whole picture. The remaining 1/4 of the screen is dark grey with a black bar in the middle. Does this mean our tv is about to go out? Thanks!

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No picture or sound in my Panasonic TH-P42UT30A plasma ...

It is the IO board and connector. Take it to a repair shop.

picture board failure
take it in for a diagnosis and quote before wasting money on home repairs

its a lcd ? replace the lcd lamps or the inverter

The problem is most likely a bad SC board, if you can find the board online it will probably run you between $250 - $300 for the part. A repair facility will charge you between $400 - $500 total to fix the unit if that is all that is wrong with it.

Change the aspect ratio to the one you like. Look at the remote and look for a button that says either aspect, pic size or format.

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

make sure your hd cable connection from your cable box is going to an hd connection to your tv.[via hdmi, dvi,or componant.] if you have a different hook up such as rca out or coax out, these are not hd connections and you are probably streching out the picture.look at the rear of the tv & cable box and see how the connections are.the hd hook up to the hd input should make the picture the right size only if it's set on the hd input channel.hook up the dvd player to a aux/line in or video/source input and try changing the picture size. you may have to play around with it till you get it the way you want.
hope this helps.
wg

hi there, you do have a vertical section problem and at the power supply section problem. do some test, check for some cold solder at the power supply section, test some electrolytic capacitor at the vertical section. ty

Why are you running hdmi to converter box? Run HDMI cable directly from dvd to new Panasonic plasma. The less things in between, the better the picture.