Question about Toshiba 57H81 57" Rear Projection Television

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Shut off F850 repeatedly keeps blowing out. Replaced vertical output and convergence output, and again keeps blowing out. jamessim46@gmail.com

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Make sure that you check for any cracked solder. and check all bridge rectifiers

Posted on Feb 21, 2008

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TV WAS WORKING FINE, TURNED IT OFF, THEN TURNED IT ONTHE NEXT DAY


Your tv might have a defective power supply, and/or convergence circuit. The initial cause of the problem, if it is the convergence circuit, is usualy a loose conection on one or two jumpers close to the convergence output circuits (STK392-1110), in with case this chips might need to be replaced and a pico fuse of 5A on the power supply too. I hope this help you.

Sep 24, 2009 | Toshiba 56H80 56" Rear Projection...

5 Answers

Hitachi Plasma Flat Screen T.V. Mod #42EDT41 Has 1" vertical line, 10 inch from left side, top to bottom. another vertical line 14 inches from 1st vertical line.could you please let me know what...


This buffer board normally will just bypass the video to the screen from the main digital board.
There could be other problems with the main digital control board but it could also have a problem with the flex cables that connect from 6871QRH037A to the plasma panel.

Aug 13, 2008 | Televison & Video

2 Answers

I have a Toshiba 61H71 that keeps blowing F850. It was just sitting there the first time it did it. I didn't have a replacement fuse so I temporarly replaced it with a 3A glass barrel type fuse. This...


Resolder jumpers on signal PCB..May be near convergence IC circuit..on 50" model they are 050 & 010. You may have solder cracks..I repaired a 50" toshiba..Let me know if this fixes

Apr 15, 2009 | Toshiba 61H71 61" Rear Projection...

1 Answer

RCA R52WM24 52 in TV


the RCA service bulletin says to replace FL231, DL231 and CL230 all at the same time then reflow the solder on the flyback and the vertical output IC

Feb 07, 2009 | RCA R52WM24 52" HDTV Projection Television

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

Burnt resistors


Depending on where you bought the ICs you could have fried the new ICs when powering it up with burnt resistors as the green is controled by both ICs one IC controling the horizontal green Convergence and the other IC controling the vertical green convergence. Have you checked all the convergence resistors out of circuit?

May 18, 2008 | Panasonic PT-53TW53 53" Rear Projection...

2 Answers

Convergence


Convergence amps can be upgraded from STK392-110 to
Hitachi brand STK394-160E Part # CZ 01341.....
+ Check B+ micro fuses F850,F851,etc.
+ solder bad connects on wire jumpers 008,010,017,048,600.
If you don't solder jumpers,you may blow fuse ( again )......T.

Let me know.............................

Nov 27, 2007 | Toshiba 42H83 42" Rear Projection...

1 Answer

No power, LED blinking, Low voltage regulator IC?


check for bad solder connections then check all fuses the ones that look like resistors too get back to me

May 22, 2007 | Toshiba 57HX81 57" Rear Projection...

3 Answers

Low voltage power supply fuses blown


If the convergence power supply fuses blew you can bet that the convergence ICs need to be changed. The blue connector will be pressed down on the rear of the connector to release or pulled up on the back end of the socket. Ps dont forget to rate this.

Oct 11, 2006 | Toshiba 57H81 57" Rear Projection...

2 Answers

Flashing LED on front panel


The place is call wwww.servicemanuals.net ,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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