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Re: i have a 57h81 no picture no sound red blinking light
Dont have the board number but it's the one with the silver heatsinks Convergence amp ic bad http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html http://www.hdtvoice.com/voice/showthread.php?t=28929 Or send to ptscorp.com
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Tv board call the Hyper board also known as a tv convergence board it is dead.Tv have any R,G,B colors lines mis alignments,have colors shadows pictures or 3D pictures look alike?Yes,than the tv convergence must have it parts to be replaced like 2 STK convergence ICS and some or all of it resistors too.To fixed the the Hyper board also known as a convergence board will fixed tv picture convergenece problems.Tvs shops will cost u like $300-350 for parts and labors.
First, if the convergence chips are bad or shorted the set will shut down and the power light will blink three times in a sequence--if no three blinks I would suggest another possible problem common to this set.
Before the set shuts off do you see anything at all on the screen after a minute or two? A strange band of noise from top to bottom on the right side? The more information you can give me the better the chance I can tell you exactly what is wrong---I have fixed hundreds of these sets--
I am here to help--give me all the information you can
It could be the lamp went out and needs replacement. The Toshiba website states when this happens to unplug the televison for 10 minutes then plug back in. If that does not work then try another power outlet. If that does not work then call for service
Solved by resoldering some solder joints!!!!!!!
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001
Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852
Symptoms January, 2009:
Upon turning on set I got flashing red power light and nothing else.
Removing plug for one minute and plugging in results in:
Audible click, steady red power light for 2 seconds then slow flashing red light
Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
Removing power cord for several hours and plugging back in made no change
Audible click, steady red for about 2 seconds then slow flashing red light
Possible related note:Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
Fuses F850 and F852 found blown
PD0074 DEF/CON Power Board
There are two main power supply capacitors in this set.They are C-809 and C-810.One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time.When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
Replaced blown fuses F850 and F852.
I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
Already owned Service Manual and Circuit diagrams from a different 2004 repair.
Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
Some solder. Already owned de-soldering tools, etc.
Visited both local authorized Toshiba factory service repair facilities.One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU!Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.
This sounds like the typical toshiba power regulator ic fault. it begins with an str##### Its not something a handyman should try to tackle. It should be repaired by a quilified repair person Sorry Good Luck