Question about Toshiba 57H81 57" Rear Projection Television
I changed out the IC's, and one pecos fuse. I turned on TV and everything was perfect. Ran TV for about 2 hours, then went to bed. Next morning turned on TV and nothing. An attempt to start up, could hear relay kicking in and then got a continuous red flashing led light from power on led light on front of TV. Checked the pecos fuse and replaced , it went out. Powered up TV, Transformer fired up, relay engaged. Guns never engaged and pretty quickly could smell something burning, disconnected the power from the board and lokked for burn outs. Couldnt find any sign to reveal what burned out, Connected power to board and get No power to flyback transformer or main transformer. Get a start up power for TV, minus the firing up of guns and a solid red led light at front power led light on TV. Trouble shot the power failure to what is a photo coupler, but not sure if that the problem. Photo coupler is ET1103. Any ideas on what my problem is. Thank you Sunny
You need to check the 1.8 ohms resistors 2watts, the horizontal output transistor.make sure that the ics that you replaced and the fuses are the exact rating that were on the original
Posted on Jan 24, 2009
IF YOU REPLACED THE SAME PICO FUSE, YOU PROBABLY HAVE A BAD CONVERGENCE IC AGAIN . DID YOY SNUG UP THE IC TO THE HEAT SINK AND USE THERMAL HEAT COMPOUND ON THE NEW IC'S? ALSO CHECK SOLDER CONNECTIONS TO C810 AND C809 THE FUSE BY THE CAPACITORS MAY BE OPEN.
Posted on Jan 23, 2009
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Posted on Jan 02, 2017
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