Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 42h81 no power

I tested the voltage on power up to see if any is present in the first few seconds and have found no voltage. from the relay i get 2 fast clicks then a 3rd. the 3rd i belive is the power on. when you plug it in it the power light comes on automatically on 3rd click.
and again no power from tuner shield to any of the fuses both sides
tom

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The third is likely B+ and having failed that no Hv will be present... It's likely in the convergence circuit. Do a continuity test of F850 and F851 (5a), F470 (2a) and F890 (3.15a). If any of those are open trace back along the +16v line to the convergence Ics and make sure everything is well soldered. Then check R482 (270 ohm) for value. If out suspect Z801 the divider and replace R482. If that isn't the problem suspect the convergence Ic's and/or the yoke return resistors.
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993
premtech@willapabay.org

Posted on Nov 07, 2008

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William Rayburn, CET
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