I have a white bar on the right side of the screen.
I have a major problem with my Samsung HP-T4254 Plasma. Where the grey bar is located on the right side of the screen during 4:3 aspect programming, there is a white area that looks like white vertical lines. Up close they are made up of 3 seperate lines of RGB. It doesn't go away and it covers over HD programming.
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Hello horrizontal ines are controlled by your buffer (drive boards) or your ysus board. They are located on the side of the tv and are 3 boards that are connected together and connect to the side of the plasma screen. the two drive boards separate the top and buton. if the lines are on the top then you might try replacing the top buffer and vise versa. if that does not work then its your y-sus. be very carefull replacing these they are very sensative.
You can get get parts for this tv at www.interliquidparts.com
make shure that the computer is set up to display on the screen. To check and see right click on your desktop, click on the option that says screen resolution, and then change your settings from their. The tv will not register that you have a computer plugged into it if the computer is not sending the tv a signal.
the capastor on the mains power board are on way out check them look for raised tops ( they look like little bateries with white line) if you are going to replace them yourself take picture so you put back same way
After installing the $11 kit and the additional $13 kit recommended by (http://preher-tv.blogspot.com/2010/01/samsung-hpt4254-no-power-repaired.html) mostly surface mount diodes (also available on Ebay), the Samsung HP-T4254 came back on, but would only play for 4 minutes. I found DX801 flowing both directions, replaced it with a diode from Fry's. Works great, $26 total repair costs :-)