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Have you checked the DC voltages leaving the power supply? If not, let's try that now.Put your red lead on each pin leaving the power supply one at a time, with your black lead on any exposed chassis metal for ground. Stick that red lead down into the connector so the lead makes contact with the pin.Be sure the TV is turned on. If it's shutting down too quickly, put your leads in place first and turn it on and see what the voltage jumps to before it shuts off (the voltage will drain post-shutoff).Let me know what you're measuring.Dan