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TAKE A CLOSE LOOK AT THE LABEL ON THE BACK OF THE SET WITH THE MODEL NUMBER, IS IT MARKED PTK195?
THE PTK 195 uses a power supply mounted above the main boards and is about 10 inches wide and 4 inches deep.
It is very common on this model for one of the ten diodes to be shorted; confirm it is a 195 chassis and I will tell you how to locate the two diodes that fail. They supply voltage to the convergence circuit and I have seen dozens where one of them shorts.
Let me know what you find; is it a 195 chassis?
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If it is a 195 chassis let me know and I will pinpoint the location of the two diodes and tell you how to check them.
I would disconect the front control panel you can do it by opening the back of the unit on top of the light box there is a couple plugs just unplug the one going to the front panel then try to turn it on with the remote
Normally this is either bad connections on the convergence ICs or defective ICs. If you can solder, you should be able to fix this. First locate the convergence ICs: large black ICs attached to a heat sink that shouldbe marked STKxxx. Try resoldering the pins on these ICs first. If that fails, replace the ICs.