Question about Toshiba TP55F80/81 55" Rear Projection Television

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I have a toshiba TP55C81 projection TV. The red The red vertical adjustments stopped working. The adjustmnet knob in the control panel does not effect the adjustment and none of the vertical adjustmen

The red vertical adjustment on my tv does not work..... I hear that there is an amplifier that needs replaced? Would I be able to get the service manual from you? I'm sure I can fix this myself, if I had a schematic of the circuitry. thank you...... I have a toshiba TP55C81 projection TV. The red The red vertical adjustments stopped working. The adjustmnet knob in the control panel does not effect the adjustment and none of the vertical adjustment on the board have an effect on the red. All other adjusments work even the red Horizontal.

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You need to replace the vertical STK convergence chip but I would recommend that you replace the horizontal chip at the same time as this is likely to fail soon.

The following relates to the repair I have recently carried out to my Toshibal 40WH08B rear projection TV but shuold be very similar to your model. Replace the STK chips with the same type on your model:

On the convergence board PB 9487 (the one with the 2 large heat sinks that the r, b & g guns plug into) you will see two STK392-110 ics connected to the large heat sinks. Replace both of these and readjust convergence in service mode if necessary.

I obtained the replacement ics from Charles Hyde & Sons Ltd (see link below). I ordered the general ics not the Toshiba ones as these are identical as far as I could see and they cost £17.19 each instead of £36.68 each.

http://www.chsinteractive.co.uk/search.html?query=stk392-110

You will need to desolder the heat sinks as well as the ics as access to the ic mount screws are obstructed by the conv.dig board (metal cased). Buy a good quality desolder pump if you dont have one.
One last thing I should mention. The white paste between the ics and the heatsink is silicon thermal compound. Without this the heatsinks will not take heat from the ics effectivly and the ics will burn out! I recommend that you clean all of the old paste off the heatsinks and apply new to the whole of the metal plates on the back of the ics before you screw them to the heatsinks. You can get the thermal compound and the desolder pump from the same supplier I recommended for the ics.

Let know if your are having any problems.

Posted on May 30, 2009

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    I RECENTLY PURCHASED A 1994 bIG SCREEN TV ( mODEL # TP55C81 ) THE PICTURE IS PURFECT BUT IM SEEING THE RED GREEN AND BLUE LIGHTS . THE CLOSER I AM TO THE TV THE SMALLER THE LIGHTS ARE AS I BACK UP THE...


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    42d3683.jpg

    7859b01.jpg

    e87380c.jpg
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