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Re: 3 amp fuse blows every time
First if you have a can of air or air compressor blow out back if using an air compressor dont blow directly on stuff up close and dont let to much air out at once then if you have another 3 amp try it if not around the prongs wrap aluminum foil around them to were they all connectput it back in then it should work
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your either overloading something cause that's what pops fuses. My guess is that what your plugging in or into has a ground issue. I'm wondering if it does it with nothing plugged in at all. I would say if you have nothing in and it does it, you need to find where the ground issue is. that's my best guess
when the fuse always blown, it could be a shorted component at the power supply board or the main board was affected during lightning where in some of the component get burned then cause a shorted line.if you don't have an idea in any electronic repair just leave it to the trained technician to do the works. hope this can help you thanks for using the fixya.
What it sounds like is the fuse on your power board has blown, or the power board itself has gone bad. You will need to remove the back of the tv, and visually inspect the power board, also note any weird smells. You can also check the fuse at this time. If it is not your power board, please let me know while you have the back off as I can walk you through any further steps at that time.
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
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.
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.