Question about Toshiba 57H81 57" Rear Projection Television

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Toshiba 57H81 Have both power/deflection and sig/conv printed circuit assemblies out of set. No shorts or low resistance paths show on either the +16 volt or +32 volt supply lines on either board. I have seen other sites with horror stories about this set regarding the convergence IC's and fuses which are suspect in this set. I'm capable of removing the two convergence IC's (STK392-110)'s and replacing them. I think the heat sink should be removed for easier replacement as screws that mount IC's are blocked. Techman has recommended replacing the IC's along with the fuses I mentioned. It will probably cost a couple hundred dollars for the parts but I don't have any other ideas at this point. The bad thing is the IC's may have nothing to do with the problem that caused the fuses to blow. Are there other experts that have experience with the Toshiba 57H81 that can offer any ideas that may help get the set up and running. TIA, C5Z06

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Re: Toshiba 57H81

These ICs are the Japan types and available from under part number C5AA00000108 for $29.08 + shipping apeice. These are original replacements for the panasonic parts. Good Luck Ps please do not forget to rate this

Posted on Oct 14, 2006

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What's your problem?40-42 inch Theater View Toshiba TV, Date on TV is June 1999. Picture slowly started shrinking from up and down. Model no. TZ50V51 Serial no. 77988872 chasis no. 9951

you're experiencing a vertical deflection issue and will most likely need to replace the deflection board. You can get a deflection board for your model from

Oct 18, 2011 | Toshiba 57H81 57" Rear Projection...

2 Answers

Put in new conv. ics, almost finished manual alignment,set chirped and went black, power button blinks and shuts down power

Pull the Sub Yoke Connectors plugs from the Convergence circuit and turn the set on. If it stays on, one of the Convergence IC's went bad. It is not unusual for them to be defective new out of the bag. If possible I would use STK392-120's instead of STK392-110's if they were the original IC'S in the set. If the set does not start, I would look at the Hv Output Transistor or the Horizontal Output Transistor being shorted.
Hope this helps,

Dec 02, 2009 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Blinking power light & black screen on toshiba 57h81

This TV could have one of several problems including but not limited to; convergence IC's,bad capacitors, shorted horizontal output transistor. Call a good TV Tech. Check with the BBB before you decide on one.

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

1 Answer

52 inch Toshiba rear projection no picture has sound

You have bad solder connections in the deflection circuit. Call a good TV tech unless you know what you are doing. You could get an electrical shock from a charged capacitor.

Jul 06, 2009 | Toshiba 57H81 57" Rear Projection...

3 Answers

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

57h82 toshiba projection tv

sounds like a bad capacitor in the deflection circuit.

Mar 17, 2008 | 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...

1 Answer

Toshiba 57H81 picture bounces. Can't tell if horiz. or vertical.

Unstable picture, wavy, jittery, and loss of sync are a symptom of bad capacitors in the hyper module. The problem is worse when the set is cold, but when warm the sympton gets less or goes away. In the latter stages the problem never gets better even after the set has been on for hours. There are about 6 surface mounted caps (10mf/16) inside the shielded Hyper module. The module is vertically mounted behind the jack panel and can be unplugged from its socket after unsoldering the 4 anchor tabs on the bottom side of the PCB. This type of repair should be made by a qualified technician do to the complexity of chassis removal and expert soldering skills.

Oct 25, 2007 | Toshiba 57H81 57" Rear Projection...

2 Answers

Toshiba 57H81 circuit board removal

Post a Picture or the service manual here on this page and maybe someone can assist you.

Oct 08, 2006 | Toshiba 57H81 57" Rear Projection...

2 Answers

Flashing LED on front panel

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

Oct 04, 2006 | Toshiba 57H81 57" Rear Projection...

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