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power supply. Check capacitors on the power supply board, replace ANY that have the slightest bulge on top, should cost you less than $10 in parts, and some through hole soldering. Ebay has capacitor kits for your TV or you can just look on sides of bad ones and replace. Try and get the same thermal rating (85C or 105C) and always get same capacitance. Voltage is not a deal breaker if you get something higher, but never lower. I'm watching a $1200 Samsung TV right now I bought for $50 and $4 in replacement capacitors.
Hi, I found the problem was related to the lamp. Your TV power up but then the lamp would
overheat and automatically shut down (audio and video) resulting in a
dark screen with no sound. Once the lamp cooled (30 - 60 secs) it would
come back on. Then overheat, turn off - recycling "eternally". A new
lamp will solve the problem