Question about Toshiba 57H81 57" Rear Projection Television

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Toshiba 57H81 circuit board removal

I now have the schematic and believe my problem which is the flashing red pwr on led and set not powering up may be a bad component on the "power and deflection" board (PDB). I need to remove it to run some static tests on at least the horizontal output transistor, fuses, etc. There are two white plastic connectors and one blue plastic connector on the right edge (viewed from rear of set) of the PDB. The white connectors pop open and up but I haven't figured out how the blue connector opens. Has anyone with experience had the PDB out and can provide any help with its removal. There are screws around the perimeter and some in the middle of the PDB also. There is slack in some of the cabling and think I can some checks once board is at least partially removed. It will have to be removed to replace components anyway. Most components on this board are "thru-hole" and not surface mount devices. The schematic itself is on 20 pages and not legible unless viewed as at least 11"x17" sheets. You can blow it up on the computer monitor but then you can't see how things are interconnected. I'm guessing maybe low voltage regulator IC or possibly one of the deflection transistors. There are many other possibilities but this is a starting point. The flashing led may be indicating that the low voltage power supply circuits have an excessive load on them and the supply itself is folding back and shutting down. This can result in an oscillatory condition where the power on led flashes.

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  • Fred Macciocchi Jan 20, 2007

    I have a schematic in PDF. Figure out how to get it through this site. I don't think they will allow me to post it.



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The blue connector pops up the same as the white,from the power/deflection side.

Posted on Jan 20, 2007

  • burton holloway Jan 20, 2007

    does anyone have a sevice manual pdf or at least a schematic diagram for a toshiba 57h81 they could share.


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

Posted on Oct 09, 2006


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Nec pf-68v21 pwr led flashing red green after horizontal output

check the supply at horizontal driver trans former ,if voltage is correct at ho/driver trasistor ...then check allthe fusible resistances from power supply,,,if tv is taking h/oscillation for awhile ,,give more screen control in lot,,, & see for a horizontal line ,,,before tv becomes off,,, if so vertical ic problem...

Mar 16, 2010 | Televison & Video

1 Answer

Toshiba 57H81 Rear Projection TV Problem

IT is possible that the power connector in the back of the set is either faulty or broken, you would have to go into the back of the set, and look and see in the connector to the power board isloose, if it is, then you might be able to resolder it on. If not, then there is a problem with the plug, try a different outlet.

Jan 10, 2008 | Toshiba 57H81 57" Rear Projection...

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Same problem. red light flashes 3 times, but will not turn on.


The blinking light means the controller QA01 in the AV_TERM system board is booting and driving the TIMER/REC RED LED light accordingly. This failure mode is true for many conditions, not exclusively for the main PS board PE0071. It could be caused by many things, LOW B, SEINE, AV_TERM, LCD, PROTECT, etc.

Specifically for PE0071+12VDC circuit failure, which is the most common , listen for the LINE relays SR80, SR81 coming online. If several (3) or more clicks are present when applying power to the TV set then suspect the +12, 20, +32 VDC inverter is faulty.

As a quick check, you can disconnect P807B. If the relays cycle every 1-2 seconds then is most definitely the +12VDC inverter. Check for voltage level at optocoupler Q881 pin 4 and this should not be cycling. This point is the VCC for the oscillator. Repair or replace board 75002913 as necessary.

TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
  2. Check for LINE2 input voltage level at inverter on sheet [3].
  3. Check for STBY +5VDC & +25 VDC ( observe correct GND REF) page [4]of PE0071 POWER
  4. Check for +22 VDC out of regulator on page [3] out of Q822 Emitter
  5. Check P809B connector for :
  • P809B (12) POWER = 3.00 VDC (+/-0.2)
  • P809B (11) POWER_SIG = 0.00 VDC (HIGH to Power on TV)
  • P809B (10) PROTECT = 0.00 VDC
  • P809B (9) ACDETECT = 3.00 VDC (+/-0.2)
  1. Check for PFC_OUT = 368-371 VDC
  2. Check for +12, +20 & +32 VDC inverter page [5] of schematic manual.

For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
D884A and related switching circuit components.

Good luck,


Jul 03, 2009 | Toshiba 42HL196 42 in. LCD HDTV

2 Answers

Toshiba 57H81, power to transformer and flyback.


Jan 22, 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

Toshiba 57h81 red light blinking

Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Jun 14, 2017 | Toshiba 57H81 57" Rear Projection...

1 Answer

Blinking red light

Your TV is in shutdown. Unplug the set from the wall and wait 30 seconds. Apply power and see if the set comes back on. If the problem is the same (red blinking light) then you need to call a repairman. The most likely suspects are the convergence chips , vertical loss, power regulator or horizontal circuit problems. The shutdown circuit monitors multiple circuits for voltage and current malfunctions. That is why you need someone trained to troubleshoot the problem. Good luck!

Nov 23, 2008 | Toshiba 57H81 57" Rear Projection...

1 Answer

Tv won't turn on

You will need a service manual to troubleshoot the set to be able to find whats going on with it . Its in shutdown mode with the led flashing. A good manual is available at this link.

Mar 19, 2008 | 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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