Toshiba 32A43 . After power surge, I replaced a fuse that I found blown on the circuit board. That did not fix it. Anything else I can check ? I got it for free, so if there is nothing else I can do , I'll just throw it away.
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have you checked for dry joints or blown capacitors , with a power surge depending what kind voltage or amperage the circuit received it might have even blown screen connect it will certainly fry a lot of components ,have you looked for holes in capacitors ,resistors or burnt tracks between components . that's about all I can think of to check also some power panels have built in fuses to stop surges if you could obtain a circuit diagram that should help you also you could google your query and see if you get any assistance it costs nothing and you could get your TV up and running again . All the best .
Yes possibile there's some IC's that are burn inside it and also the power supply can be damage so resetting it will not do anything , if you can take it to a repair center and let them check this unit and fix it.
Yes usually replacing the power board will solve the issue . You can get the power boards for most phillips at www.tvcircuitboards.com boards all have 6 month warranties
Hi:
CHeck for open line fuse you may of had a surge that blew the fuse especially when there is no power indication at all. IF no fuses are blown on the power supply then suspect a faulty power supply circuit.
Check for about 100 to 500 volts on G2 pin (screen voltage) when screen control is adjusted,if less than 200 volts,remove the g2 capacitor(from G2 to ground) on crt board,if screen regains brightness,then replace capacitor,if ok ,troubleshoot the ABL circuit,look for an open or changed valued resistor,also check your heater voltage.Good luck.Cheers.
Check the power supply transformer primary driver transistor and the associated components (some diodes and capacitors, resistors, an optocoupler maybe) and the rectifier diodes (or a bridge) and capacitors at the transformer secondary, what you are looking for is a short circuit, however, the short may as well be in another section of the circuit board (a shorted component may sometimes have signs of damage caused by heat, but this is not a rule).
Solved by resoldering some solder joints!!!!!!!
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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.
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.
You should contact Toshiba for any related problems , if it is still under warranty.
Most of the time it is only the fuse that has blown on the Main Powersupply Board. ( The one that takes in your power cable )
Worst case cenario you'll have to replace the Powersupply Board.
Write down your Serial Number at the bottom of the Projector and give Toshiba a call and ask them to check if the warranty is stil valid before attempting the above.
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