Question about Toshiba 50HX81 50" Rear Projection Television

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F850 fuse blown in Toshiba 50HX81. What does that protect ? Replacement ?

Blinking red light syndrome. Is it a fast acting fuse ? Can I just cut-out fuse body and make-up an inline fuse to alligator clips and clip onto posts in board for a quick test ? Please advise. Thanks. Don

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Hmmmmm can you replace the fuse

Posted on Mar 11, 2009

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1 Answer

Tv will not turn on blinking als red light


the answer for this problem happens to be a blown projector or broken projector bulb it needs to be taken to a shop and be replaced

Dec 12, 2009 | Toshiba 50HX81 50" Rear Projection...

1 Answer

REd light blinking on my 50HX81 CRT TV- Toshiba,no pic no sound


Two possible easy ways to find what the problem is:

1.) Locate F850 and F851 on the power supply board--they are fuses but not glass--little green or orange pico fuses---both will have the location marked on the top of the board.(THEY look like a small resistor)

2.) They protect the Convergence circuit on this set and if either is open (blown) the set will go into shutdown.

3.) If you find one is bad (or both) someone needs to locate the TWO convergence IC's that this set uses--they are located on large metal heat sinks side by side and are black in color with 18 pins each---2 1/2 inches wide X 1 1/2 inches tall and Black in color---they will have the STK-392-110 printed on them in white.

4.) The idea here is if the fuses are blown you need to gain access to the two chips and UNSOLDER all 18 pins on each of them--if either of the fuses are bad you replace them and with the chips unsoldered turn the set on---if it comes on and stays on the Convergence will be out the window--but you will know one or both chips are bad.

5.) If depends on if you are able to do this---the repair is fairly easy---hard part is getting at the chips---You need to replace BOTH of them AND check all the resistors around them (like checking a fuse--no reading across one means it is gone---This set uses several 1.8 ohm protect resistors for this---


If you find either of the fuses bad---you have to decide if you can do the repair or need someone to do it for you----IF EITHER FUSE IS BAD--DO NOT BYPASS IT OR REPLACE IT- a waste of time and doing that may just cause more damage.


Let me know if you find one or both 5 amp fuses bad.

REGARDS, SD TECH

Oct 10, 2009 | Toshiba 50HX81 50" Rear Projection...

1 Answer

REd light blinking on my 50HX81 CRT TV- Toshiba,no


Check out the link below. Seems to be a power issue. Not sure if it is worth fixing.

http://www.justanswer.com/questions/1opaa-50hx81-tv-not-turn-power-button

Mar 07, 2009 | Toshiba 50HX81 50" Rear Projection...

1 Answer

I have a TP43H60 toshiba and the power light continues to blink red and there is no picture or sound. I can't turn it off either unless I unplug it??


You have blown one of the pecos fuses, probably the f850 or f852, you can test them with the power unpluggrd and with an ohm meter. Replace them with only the recommended amps fuse. Your set is going into standby, because of the blown fuse.

Jan 28, 2009 | Toshiba TP43H60 43" Television

1 Answer

Toshiba 50HX81 projection 'tv- blinking red light


The TV is on protect mode.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

Also ensure that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.

If that does not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.


If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occur are a blown capacitor on power board, a convergence IC has blown, or a fault on Digital board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.


If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

Jan 27, 2009 | Toshiba 50HX81 50" 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 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...

2 Answers

Power indicator light blinking


Check soldered in micro fuses...F850, F851 etc.....
1) solder jumper wires on signal board = 008,010,017,048,600
2) Check / replace STK392-110 convergence IC's with Toshiba
part # 23135090 or upgade to Hitachi part # CZ01341
Let me know....................T.

Jan 04, 2008 | Toshiba 65HX81 65" 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...

1 Answer

Toshiba TZ50V51


First step is to use an ohmmeter and check all fuses including
small,soldered in kind called micro-fuses.....F850,F851,F852 etc
.................................T.

Oct 03, 2007 | Toshiba 50HX81 50" Rear Projection...

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