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Possible cause could be a defective HVG (5904). Replace part with part number listed in this service manual.
Possible cause could be a defective Convergence Amps (7044 and 7045) on Small Signal Module. Replace part with part number listed in service manual.
Ours 60" (60P8342) turns off after a short period of time also. My husband researched it online. The cheap solution he was told to try is to unplug the TV (or plug into power strip and switch off) when you are done watching it. A computer board inside over heats and it's a protection mechanism for it to turn off. Otherwise, it's over $100 to fix the computer board.