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TV switches its self off when I turn on.

I have a Toshiba 40WH08B back projection TV. A recent problem has developed in that when I turn the TV on, a protection circuit cuts in and turns the set off. Red power light stays on and the green timer light flashes. I have found that if I remove the connector marked red from the board with the 2 large heat sinks, the TV will turn on but with obvious visual defects due to the lack of the red gun operating. If I then turn off and plug back the removed connector, the TV will work fine for a day or two before the problem returns. Any Help would be much appreciated. I have the service manual. Regards Kelvin Harley

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  • Televison & ... Master
  • 12,935 Answers

Protection circuits usually cut in when you have power supply issues and too much current. U might want to start checking out your power supply for bad components.

Posted on Apr 09, 2017

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6ya6ya
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Posted on Jan 02, 2017

techman
  • 3130 Answers

SOURCE: Hitachi 50EX20B Bigscreen TV

You can download a PDF from here: http://www.servicemanuals.net/results.aspx?type=SM&brand=0&model=50EX20B Make sure that the coolant is not leaking out onto the printed circuit boards. i have had the remote sensor cause this problem before and also I have had bad capacitors in the sweep and the main power supplies. Good Luck

Posted on Jun 14, 2007

  • 2 Answers

SOURCE: 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.

Posted on Jan 05, 2009

  • 1 Answer

SOURCE: standby/timer light stays on red. no picture or sound on tv.

my sony red light flash.but it will not turn on just clicks

Posted on Jan 18, 2009

Ecollier2012
  • 3459 Answers

SOURCE: I have double vision on my projection tv (toshiba 42H83).

Sounds like your convergence chips have failed. This is a common problem. You can get a repair kit from www.TvRepairKits.com .

Posted on Apr 11, 2009

  • 147 Answers

SOURCE: TV won't stay on. Green & Red light timer-lamp (Green) stand by/temp (red) flash.

Most likely needs a new lamp. Easily done yourself.

Posted on Apr 15, 2009

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One or both of the STK convergence chips have probably failed.

I can give you guidance on this if you are confident to do the repair. I had the same problem with my Tosh 40WH08B and after replacing these chips it works like new.

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Convergence IC's need replacement = STK392-110 original #...
Use name brand Toshiba, NAP, or upgrade to STK394-160E
Hitachi part # CZ 01341...no cheap generics..they won't hold up..
Chassis pull and some precision soldering will be needed....let me know if you need further info...........................T.

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If the convergence on one or more color does not align using the convergence setup procedure, that means that one or more convergence ICs must be replaced, that is the reason why you get bad picture.

That means that the convergence ICs are bad and must be replaced, the job is about $200/$300.

Here there is an example of the repair needed: Fixing Convergence problems in RPTV's

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The problem is probably that one or both of the STK convergence chips have failed. These control the convergence coils around the red blue and green guns and are the most common cause of sudden convergence problems and the protection circuit shutting the TV down when turned on.

I can post details of how I replaced these on my Toshiba 40WH08B. Yours should be similar.

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Did you check the supply fuses to the convergence ICs? Did you check the output resistors
then i would start by replace the convergence ic first.
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

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