Question about Toshiba 57H81 57" Rear Projection Television
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
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
The place is call wwww.servicemanuals.net ,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
Tips for a great answer:
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
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.
Look for a separate board or an area which has larger
components in it.
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.
If this damage was caused by a high voltage spike replacing
the fuse may be fruitless and if a replaced fuse blows again, then other
circuits have been damaged and major boards will have to be replaced as well.
The cost of reviving a lightning damaged set of any kind can
often exceed the cost of replacing the whole set.
Even the most primitive plug strip contains components that
afford some protection against this kind of damage but the best protection can
be had with a 'whole house' surge suppressor.
These cost ~$200 US and feature insurance against appliance
losses up to $10,000.
They require access to the main breaker box, safety precautions and a few tools for installation.
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