Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 42H81 Fuse Type

Hi!..I had a question regarding F850 ad F851 in my Toshiba 42H81. These are 5A, 125V fuses. I want to purchase them locally if I can. Are these special types of fuses? Do I need to order the exact same manufacturer type? Any advice would be well appreciated...thanks!

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  • Joe Stiene May 28, 2008

    Ok...I just ran out to a local repair shop and grabbed a couple micro fuses a I am good o go..,I do have a couple order quick questions if you have thetime.



    1.) F850 blew but F851 did not after I replaced both. Is it possible that D851 is bad? I am in the process of resoldering all jumpers as you have noted previously in other posts..hopefully that caused F850 to blow again..



    2.) I saw a note the C809 and C810 neex to have negative terminals resoldered...I am having trouble locating these capacitors in my Toshiba 42H81...do you know where they are located?



    3.) other than replacing the (2) Conv IC's (already did) and resoldering all jumpers, anything else I should be focusing on? All resistors in Conv IC circuit seem ok btw..

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Speed rating is micro = any chemical micro fuse will work,5 amp, of course.Not necessary to use Mfr. part........T.

Posted on May 28, 2008

  • Vista Electronics May 28, 2008

    1) Solder jumper wires

    2)Disregard

    3)How much did you pay for -150's ?



    ..........T.

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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...

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

Fuses


Black,soldered in micro fuses near front edge of main PCB

Nov 04, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Oshiba 42H81 42


Check F850,F851 fuses = 5 amp micro ( black ) soldered in.
Did you use -150's from kit X480293 or ? What price did you pay?...............................T.

May 27, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

F850/F851/F852


www.partstore.com will have the fuses you need F850 and F851 are part number 23144627 125V 5.0A axial and F852 is part number 23144624 125V 2.0A axial just enter those part numbers in the search box for part number and they will have your fuses.

Apr 25, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Indentifying fuse type on tac0151 chassis


Are just regular fuses 5A/125V. You can replace them with anytype 5A fuses.

Jan 05, 2008 | Toshiba 50H81 50" Rear Projection...

1 Answer

Help


One or more micro fuses blown = check all = if F850 851 bad =
Replace convergence IC's + solder any / all bad connects, esp.
jumper wires 008,010,017,048,600. Replace blown fuse(s)......T.

Nov 04, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 42h81 rptv


Pull chassis--check all fuses,esp, F850 & F851.They protect
the B+ supplied to convergence circuit.They are found in the power
supply,on edge of the main board.On the signal board,locate the
large IC's mounted to heatsinks.IC part #  STK392-110.Between the
edge of the signal board and the IC's---locate two grey jumper wires
and some hard wire jumpers = solder them all,if you don't,the fuse may blow again.Next,replace IC's with Hitachi up-grade part
# STK394-160E....Reassemble...power on.....touch magic focus
and you are done....T.     ?????s-----Let me know...

Oct 28, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 50H81 TAC0151 Blowing Fuses, I Need schematic


Well without the schematic, knowing Toshiba they have alot of convergence problems, so see if the fuse blown in the convergence area, if you you may have to replace convergence amps. These are the big STK's. Most of the time there was a color problem with set before going out. If no problem with this on your set then look in the HV area Hor. and Ver. area. Hope this helps!

Sep 09, 2007 | Toshiba 50H81 50" 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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