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If the line is less then 2 inches wide this us a good indication of a bad PDP panel (Screen) usually very thin lines indicates a failure in the screen itselg, altho you might try replacing the upper and lower buffer boards to ensure its not the screen. You might want to take off the back and try reseating all connectors leading to the buffers and the Digital board. But in my experience thin lines less then 2 inches usually results in a bad PDP.
a4.. there are 2 of them, upper and lower buffer boards.. they control the top and lower half of screen devided horizontally, i have had many run ins with these sets. and usually the buffer boards arent cheap.
they plug into the ysus( y sustain).. its possible your y sustain is blowing the buffer moduals because one of its i.c.'s under the heatsink has popped on ya.. effectively creating a short that blows the buffer boards.
remove the buffer boards, turn tv on... feel the 2 silver heat sinks on that y sustain( beware dont zap urself.. just the tip of your finger on the heatsinks)
you may find that one is cold and one is hot...if so, you need a new y sus and probably to replace the buffer boards the a4 upper and a4 lower.
If you get a new ysus.. plug the a4 upper and lowers into it, look at your picture.. if ur missing the top half the top buffer is blown or lower half the bottom buffer is blown. or..no picture they could both be blown..an easy way to tell if u have no picture to diagnose is..touch the heatsinks that sit over the chips on the buffers..if they are red hot.. they are bad and shorted internally.
I just had my HP-R4252 repaired on 12.05.09 with a similar problem. The picture is covered in horizonal, broken lines and the color is predominately red. They lines are grouped together in large bands across the screen.
The tech replaced the Y-Buffer boards (Up) and (Low) in about 20 minutes.
Samsung BN96-02034A BOARD, Y BUFFER UPPER ASSY Samsung BN96-02216A BOARD, Y LOWER BUFFER ASSY