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This is a problem with the YSUS and buffer boards. These boards are linked on the TV and due to heating issues, they tend to get damaged together and cause your TV to lose picture. These guys sell all 3 boards are are really reliable. I've used them before. http://www.itritek.com/ysusbufferforsale.html
Most cases the Y-SUS, Y upper buffer, and Y lower buffer is the problem. The replace the 3 boards are located on the left side of the chassis when you open up the TV. 90% of the time this will solve the problem.
Look for burn marks on the upper and lower buffer boards (mostly around the chips with the heatsinks on them).
the problem can be traced from the power bd. you will need a digital volt meter. There are settings located on a sticker located on the upper right corner Va,Vset,Ve, Vset etc..... each one has a DC voltage. compare the voltages to trace the source. My suggestion from experience is the Y Main upper or lower buffer which ever has a brn mark located on the metal of the panel. Google a local dell dealorship or a repair company in ur local area, and get serviced.
the problem was the y-sus board, i had a local tv repair shop diagnos that much for me. although, he couldn't fix it i did some research and found a company in california, itritek.com, who could. you send him the y-sus board and the two buffer boards and he not only repairs them but he upgrades them. apparently the y-sus board gets too much heat and eventually goes out, sometimes the buffer boards are affected too. itritek.com replaces the components on the y-sus board with better parts which are more heat resistent. i believe this will help you with your problem. let me know...good luck.