Question about Toshiba 57H81 57" Rear Projection Television

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Toshiba 57H81 Blinking power light

The red power light on the front of my 57h81 Blicks but there seems to be no code. when you hit the power button it will display a steady light then begin to blink with no code. i can't find a fuse and it acts like it wants to turn on then the light starts flashing. red light blinks.no picture.no sound

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  • 1,879 Answers

Greetings,

Power supply cannot sustain / provide juice to the whole system.
If you are qualified to do electronics, check the power supply section, otherwise contact a repairman.

Keep us posted and thank you for using our service.
FixYa for all your troubleshooting needs.

Posted on Jun 29, 2008

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Red power light continuously blinking. no picture no sound.


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Blinking power light & black screen on toshiba 57h81


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Jul 11, 2009 | Toshiba 57H81 57" Rear Projection...

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Mar 19, 2009 | Toshiba 57H81 57" Rear Projection...

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Toshiba 57H81 Flashing Red Power Light, Blown Fused F850+F852


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

Repairs Made:
  • 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.
      • Used a fast blow 2 Amp for F852.
  • PD0073 SIGNAL Board
    • Re-soldered Q751 + Q752 STK392-110 Convergence Amps
    • Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10
  • 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.

Jan 04, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

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

Feb 07, 2008 | Toshiba 57H81 57" Rear Projection...

1 Answer

Power light blinks at one second intervals


· http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
· http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Nov 03, 2007 | Toshiba 57H81 57" Rear Projection...

1 Answer

Toshiba 57H81


Check all fuses in the power supply and look for any bad connrctions on the PCB. You are probably missing the 130 volt supply to the horizontal circuit. Common reasons are: Shorted horiz output transistor; flyback transformer, picture tube arcing , bad power regulator IC. In short, you need to get a qualified tech for this symptom. Hope this helps.

Oct 29, 2007 | Toshiba 57H81 57" Rear Projection...

3 Answers

Toshiba 57H81 Blinking power light


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

May 22, 2006 | Toshiba 57H81 57" Rear Projection...

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