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U DM power supply board have dead capacitors,before the capacitors have some functions left,that why u able to recycles by pushing the power buttons 3 or 4 cycles to get power to the tv.U have tools,soldering iron,solders,and know to do soldering?Tries website like Tvrepairworld.com to buy a capacitors kit,that design to replaced in the DM power supply board.Look around and replaced these dead capacitors,it alway bulges up or puff up on it top.Ur tv will power up and as normal again.
mine does the same thing obviously it is a high voltage problem with the power supply or flyback transformer,we have power outages all the time more thank likely it was the colprate good luck ,my suggestion do what im doing throw it in the trash and buy a new one ,it will cost more to repair we live in a throw away society they dont make anything worth the crap any more ,tvs used to last 25 years now if your lucky 5.