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.
- 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.