Question about Toshiba 55H70 55" Rear Projection Television

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Convergence fuse Toshiba rear projection tv

Hi one of the fuses on the convergence board keeps blowing. its a 2amp fuse there is other fuses close to it that are fine when i changed it i could line up the red & blue pic was back to norm, then it blew shortley after and the red & blue crosses will not move so im  not sure wot to check next any help

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Wire jumpers need re-soldering....Locations 008,010,017 etc
on inside edge of signal board near convergence IC's.....research
my Toshiba " H " Model rear projection " blows fuses" solutions.
...................................T.

Posted on Jan 27, 2008

  • Vista Electronics Jan 27, 2008

    Solder also jumpers 048 and 600................................T.

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I have A toshiba 57HX81 tv red ligth blicking.i found (2)5 amp pico fuses at F850 & F851 & (1) pico fuse 2AMP at F852 would replacing these fuses bring the tv back to life.


Too many possibilities to predict if the fuse replacements will make the set function again but I suspect your main power supply has failed so if the fuses blow after replacement, you may have to have the supply repaired or replace it.
You might check, using your model number, at the site below to see if they have a power supply 'pull' available from their stock. They part out retired sets of all kinds.
Jimmy's Parts

Nov 27, 2010 | Toshiba 57HX81 57" Rear Projection...

1 Answer

Blowing fuses p50830bl


the board mounted overtop the of the chasis is the convergence power supply board
replace that board will bring your tv back to life
then go into menu readjust convergence red and blue DO NOT MOVE GREEN

Sep 01, 2009 | RCA P50830BL 50" Rear Projection...

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

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

Toshiba TP61F80 Projection TV


Check power supply for open micro fuse{s}-- If the fuses for the convergence circuits B+ are open,replace convergence IC,s and fuse devices.Then perform re-alignment in servicer mode.test run.Don't forget--PVAT! solder any/all bad connections.

Sep 28, 2007 | Toshiba TP61F80 61 in. Rear Projection...

1 Answer

Blinking red power indicator light


Pushing it back in place went it went out tells me that the problem is probably a poor solder connection. That arcing probably took out one of the fuses, but a fuse is NEVER the cause merely a symptom. I would begin by examining the black wire that feeds the +16v to the convergence IC's on the main board. The convergence circuit is the most thermal circuit in that unit. Next check for any jumpers and other component joints that appear to be ring cracked. Even the convergence amps themselves. Then check for open fuses after you've made a good inspection. Check for fuses: F850 & F851 5amp, F470 2amp, and F890 3.15amp and one of these are likely open. But if you replace them without correcting the problem that cause them to open it will simply happen again.. Good Luck Bill

Jun 10, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Blinking red power indicator light


This appears to be a duplicate post - - and I'm not sure which one you'll check for an answer so here goes: Pushing it back in place went it went out tells me that the problem is probably a poor solder connection. That arcing probably took out one of the fuses, but a fuse is NEVER the cause merely a symptom. I would begin by examining the black wire that feeds the +16v to the convergence IC's on the main board. The convergence circuit is the most thermal circuit in that unit. Next check for any jumpers and other component joints that appear to be ring cracked. Even the convergence amps themselves. Then check for open fuses after you've made a good inspection. Check for fuses: F850 & F851 5amp, F470 2amp, and F890 3.15amp and one of these are likely open. But if you replace them without correcting the problem that cause them to open it will simply happen again.. Good Luck Bill

Jun 10, 2007 | Toshiba 42H81 42" Rear Projection...

2 Answers

Blown fuse over and over


you need to solder all the connectors and plugs between the 2 boards

Mar 05, 2007 | Toshiba 42H81 42" Rear Projection...

1 Answer

Toshiba 55hx70


check all the fuses. Its easy to mis the 2amp pico fuse mounted near the middle of the power board. When this fuse opens, the red at the top, especially at the left side of the screen, will not adjust enough. Be sure to use new heatsink compound behind the ic's Shutdowns,are usually,not an easy repair Good luck

Jan 31, 2006 | Toshiba 50HX70 50" Rear Projection...

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