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There is no power going to the tv. i unscrewed the back and found a fuse was blown, i replaced it but i still have no power.it is a toshiba rear projection tv model 51sw9ua

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Delicate circuits have been damaged before the fuse could blow it will need to be repaired by a service pro


hope this helps you
'
best of luck

Posted on Dec 29, 2010

Testimonial: "was good answer, not what i wanted to hear but was still helpful. cheers"

  • sonic boom electronics
    sonic boom electronics Dec 29, 2010

    ha ha it never is but thanks for the testimonial dont stress you wil find the repair should not run you more than $150 u.s if there is anything more i can help you with feel free to let me know here is my company email address sonicboomelectronics@hotmail.com

    take care yours kirk

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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

MY SCREEN IS DARK OR BLANK EVERYTHING ELSE WORKS GOOD JUST NO PIC


Hello fixedopsmike,

There is a fuse in the TV set, if you would like to check and see if it has blown, here is a way you can do it:

1) Unplug the TV's power cord from the wall

2) Take the back off of the TV by removing the screws and slowly removing the back panel.

3) Look for a component that looks like a glass tube with metallic caps on each of the ends, this will be the fuse.

4) Visually inspect the fuse to see if it shows signs of being open (Blown) These signs are burn marks inside of the glass tube, an open conductor (wire) inside of the glass tube, or no visible wire inside of the tube.

5) using a multimeter set to resistance (R x 1) test the fuse for continuity (remove and change the fuse if found to be defective)

6) If the fuse is not bad, reinstall the fuse if removed, put the rear cover back on.

Now at this point we have determined if the problem is a fuse being blown or not, if you replace the fuse and the TV works great the problem is solved, if you replace the fuse and it blows again, or if the fuse was ok to begin with, then you have a problem that will require some knowledge of electronics pass the basics to continue on. At this point I would suggest that you call a qualified TV repair technician to troubleshoot and repair the TV in question.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Nov 22, 2008 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

1 Answer

Toshiba 50H81 Has Power but No picture or Audio


ok i'm goin to need more info about your problem. you stated fuses and didn't say the location numbers of the fuses. Also, have you rechecked your fuses to see if they are all still good? 3 fuses sounds like more then one problem. once you tell us your loc#'s of your fuses, we can look into your problems.

Apr 07, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

Toshiba TV 50HX81


Check fuses on Power Supply board (F850, F851, F852) and all other fuses. Replace blown fuses (will need an ohm meter to check fuses). I would also replace the two convergence amps (STK392-110's on the signal board, the big black ICs on the two heat sinks). This worked for me.

Mar 30, 2008 | Toshiba 50HX81 50" Rear Projection...

1 Answer

Toshiba 50H82 blown fuse f470


Solder jumper wires for prevent maintenance.....on signal
board = 008,010,017,048,600.............................T.

Oct 23, 2007 | Toshiba 50H82 50" Rear Projection...

1 Answer

Toshiba 50


1) Blown fuse ( soldered in) = caused by bad solder connects.
2) For repair = pull chassis, solder connects,replace fuse
3) Replace convergence IC's ( possibly damaged)
4) Re-assemble,test

Oct 22, 2007 | Toshiba 50HX81 50" Rear Projection...

2 Answers

No video, Blown fuse f470, audio works great.


check your h uot transistorthen check pico fuses

May 26, 2007 | Toshiba 50HX70 50" Rear Projection...

1 Answer

Tv went off by itself


When you turn the tv on all the voltages come up for a second but the power supply is sensin a problem and it kills the high volatge and other voltages.One of the voltages the supply sends has a short.The tv needs to be service because components need to be checked and then replaced. Be safe and Seek the help of a technician to diagnose the problem.

Oct 01, 2006 | RCA D52W19 52" Rear Projection Television

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