Question about Toshiba 57H81 57" Rear Projection Television

3 Answers

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

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.

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  • Anonymous Jan 27, 2009

    I have the same problem with a 50HX81. What component caused the fuses to Blow? I have yet to check the cap's (only visual) but replaced the convergence IC's. Did you put in the fuse panel for ease of access? If so can you tell me the specifics? thanks.

  • Anonymous Mar 01, 2009

    Thanks for the original post. What is the recommended wire size for the fuses? Thanks.

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Estou com uma tv toshiba md 57h81que estar com dente de serra sobre a imagem deslocando-a da direita para a esquerda e um traco vertical tipo descarga de raio no lado direito da tela parecendo falta de sincronismo v. h. ou faze horizontal

Posted on Aug 11, 2011

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I had same problem. I checked picture tube by disconnecting them 1 at a time. Start with blue which is most common. Unplug tv and disconnect the tube from the board.Now plug tv in. If it comes on you have the right tube. If it doesnt try the others one at a time.

Posted on Feb 11, 2009

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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.

Posted on Jan 05, 2009

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2 Answers

I have A toshiba 57HX81 tv red ligth blicking.i found (2)5 amp pico fuses at F850 & F851 & (1) pico fuse 2AMP at F852 would replacing these fuses bring the tv back to life.


Too many possibilities to predict if the fuse replacements will make the set function again but I suspect your main power supply has failed so if the fuses blow after replacement, you may have to have the supply repaired or replace it.
You might check, using your model number, at the site below to see if they have a power supply 'pull' available from their stock. They part out retired sets of all kinds.
Jimmy's Parts

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1 Answer

Will not turn on...just a flashing red light


Evidently this is a common problem with Toshiba rear projection TVs. You might be able to get it working temporarily by unplugging it, pushing the power button a few times, plugging it back in, and then turning it on. Most likely your power supply is going out on you, and should be taken in to be repaired.

Temporary solution found here.

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I have a TP43H60 toshiba and the power light continues to blink red and there is no picture or sound. I can't turn it off either unless I unplug it??


You have blown one of the pecos fuses, probably the f850 or f852, you can test them with the power unpluggrd and with an ohm meter. Replace them with only the recommended amps fuse. Your set is going into standby, because of the blown fuse.

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Toshiba 57H81 57" TV Power


I have a toshiba 55hx70 same problem,repair guy just left said it was the power supply and wasnt worth fixing 350 to 400 dollars The tv is 9 years old and they wouldnt even take it to shop. Its been a great tv firs thing to go wrong.. Wo nder if I could replace it myself???

Dec 22, 2008 | Toshiba 57H81 57" Rear Projection...

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F850/F851/F852


www.partstore.com will have the fuses you need F850 and F851 are part number 23144627 125V 5.0A axial and F852 is part number 23144624 125V 2.0A axial just enter those part numbers in the search box for part number and they will have your fuses.

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is your high voltage still comming up?
ok turning up screen controls with tv on. what do you see?

Apr 11, 2008 | Toshiba 50H81 50" Rear Projection...

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Toshiba TV 50HX81


Check fuses on Power Supply board (F850, F851, F852) and all other fuses. Replace blown fuses (will need an ohm meter to check fuses). I would also replace the two convergence amps (STK392-110's on the signal board, the big black ICs on the two heat sinks). This worked for me.

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Toshiba TZ50V51


First step is to use an ohmmeter and check all fuses including
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.................................T.

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Flashing red light


You might want to check http://tacpservice.toshiba.com/TACP/subpages/pdfs/TechBulletinsTV2002.pdf the first Item talks about power LED lights Power supply does not start

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