Question about Toshiba TP55G90 55" Rear Projection Television
Hello all, I have a toshiba tp55g90 TAC 9753. This unit was hit by lightning. After the storm it was totally dead. The main fuse on the power board was blown. I replaced it and it is still dead but dosent reblow fuses. I pulled the power conv board and there is a burn/ smoke mark. The power comes to the board and goes directly to the fuse. The one that was blown. After that there are two rectangular holes mayb 1/16 by 1/4 or so. They are spaced close and are between the ac. This is where the burn is. Looks like the lightning arced across this void. The burn isnt bad, it didnt take out any traces. Just put a jagged edge on them. After that there is diagram # d899. This physically like a disk cap or a varistor. It has a schematic diagram symbol of two arrows pointing at either side of a line. this part isnt burnt physically, but is the next part in parallel with the arc path. What do you guys think? I have basic electronic knowledge, but I generally work on tube circuits. When it gets past 1970 it starts to get a little fuzzy on me. Thanks for reading all this and hopefully with a little luck I can get my tv back! Brennan
SOURCE: toshiba TP61E80 blows fuse
Blows AC fuse on plug-in is a direct short in power supply...
check components with ohmmeter to find short....Check MOV
across AC line by measuring across AC fuse clip.......T.
Posted on Jan 31, 2008
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:
Total Cost to Repair about $10
Posted on Jan 05, 2009
SOURCE: Toshiba 42
This is not a bad tube it is a convergence problem. Your convergence amplifiers are malfunctioning, and need to be replaced. If you have a background in electronics, you can remove the back of the TV locate the Convergence ICs (using the schematic or service manual) and the order the parts you will need which are the two convergence ICs and the biasing resistors (you will see these on the schematic). To remove them unsolder the pins, unscrew the screws holding them on the heat sink and remove them carefully, if they stick use a solvent to break down the adhesion of the heat sink paste. Once loose, take them out and then unsolder the biasing resistors and replace them with the ones you ordered along with the ICs.
To install the new ICs put heat sink paste on the back of the ICs and insert the pins into the proper holes in the circuit board. Screw the screws back in securely, and solder the connections back.
After doing this you will need to perform a convergence adjustment, using the cross hair adjustment screen (access this from your TV menu). and the you will need to do an advance adjustment using the crosshatch pattern (also accessed from your TV menu).
Once these are done use you service manual to follow the procedures on locking the adjustments into the TVs memory.
I hope this helps,
Posted on Mar 23, 2009
Well, my thought is that there are a ton of knock off generic convergence IC's out there that usually hold up as long as yours did. Professionals like me will only use Sanyo original STK's. The counterfeit STK's out there are everywhere. Do some research on the web to locate Sanyo originals, they are out there.
Posted on Jun 11, 2009
It could either be due to the convergence Circuits ( If the Power Indicator Blinks) or the power deflection board if it doesnt blink. I have a source for parts if you would like the link.
Posted on Jun 20, 2009
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