Question about Toshiba 36A40 36" TV

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My Toshiba model 20AF41 does not come on anymore. When plugged in, there is a click as if the set is powering up, but the red light stays off and the screen remains dark. The click repeats about every five seconds as long as the set is plugged in, but nothing else happens.

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The problem appears to be with the power supply. Not an easy or cheap fix. Based on the age of the set, bought a new one....not the same brand.

Posted on Oct 03, 2009

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Red power button blinking but tv won't power on


chec your ic register diode and transistor.
aslo check poer supply waltage and earthing properly.

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Click when plugged in and steady blinking red light.


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The Power Light is Red


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Per user manual:
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Toshiba 57H81 Flashing Red Power Light, Blown Fused F850+F852


Solved by resoldering some solder joints!!!!!!!
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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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1 Answer

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Well, sorry to say but it looks like it is a power supply. Over here we have checked everything and done some research and it looks to be the power supply. Go buy a new tv --_-- .........

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Screen shuts off


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1 Answer

No picture


95% 0f the time when this happens to a toshiba projection or regular set, the power regulator IC is bad. It is a componet that should be replaced by a service technician as there are too many points inside this set that can zap you and hurt you. If thats the only problem your talking in the range of 175 to 250 to repair this set. Good Luck

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