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Question about Toshiba 57H81 57" Rear Projection Television

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Flashing LED on front panel

It appears that problem is power supply related. No high voltage, no audio. Set does not power up. Fuse not blown in low voltage circuit. Need service manual to trouble shoot. Any recommendations where to get schematic. The places I see don't inspire confidence. PDF downloads etc. There is a relay in low voltage circuit which I can here energize but then LED flashes but set doesn't appear to power up. Any help appreciated. C5Z06

Posted by Anonymous on

  • Anonymous Oct 04, 2006

    Thanks for your input. I'm still trying to locate the schematic as the service manual does not contain schematics. Found that the 57H81 is covered by the 50H81 manual.

  • Montauk17 Dec 08, 2007

    My set has the same problem (blinking light after hearing relay energize). I am curious if you found the problem/solution to your blinking red light.



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I had this problem and found pico fuse (5A 125V) F850 open. I replaced it and the set powered up with a perfect picture. F850 and F851 power the convergence circuit. You will have to solder the replacement fuse in place.

Posted on Jun 11, 2009



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The place is call ,you can get it download or a paper copy,for this set I dont know the price but it will give it to you when you put the model number.Check for shorted horizontal output and loose conections,sometimes intermitant conection damage this transistor.Be careful

Posted on Oct 04, 2006


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In most cases, if the main power supply fails, the low voltage supply that provides enough power so the set can receive input from your remote, also lives on to signal problems, often by flashing the power LED in a pattern.

In your case, apparently the low voltage supply is also dead.

This can be caused by both supplies being damaged from a line surge caused by 'dirty' AC power, or a spike from a lightning strike somewhere in your power network.

These spikes can travel long distance so a strike need not be all that proximate to do damage.

If no fuse holder is found on the back of the set, it may be necessary to remove the back panel for access.

If you choose to do this, it is safer to leave the set unplugged overnight to allow any hazardous voltages to discharge.

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These will be cylindrical cases and larger block-like parts.

If there is a user-replaceable fuse in the set at all, it will most likely be in that area.

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