Question about Panasonic Televison & Video
If everything else works other than perfectly black and white (no dolor) then I would suspect either the color crystal or the trimcap (variable capacitor) in the chroma section. No more than two (2) pins to solder, should not cost much and that bulk of the repair job would be disassembling the board to have access for the soldering job.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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Posted on Jul 19, 2008
The above site has some instructions on how to get into the service mode. You may be able to adjust the color balance and other settings to bring the picture back into the right range of acceptable color and focus.
Hope that helps......
Posted on Jul 18, 2008
What I do with colour cast problems :-
1) check the voltage (with no aerial signal) on the collector of all three video output transistors (on the crt base) they should be +-5v of each other if one is different, then swap over this transistor with one of the other two and if color changes, its the transistor, If not then I use a 2k-4k wirewound and touch it from each collector to chassis in turn, and watch the screen (I use a mirror) each color should be equally bright with flyback lines, if not its probably the tube (CRT) faulty.
2) If all of tests are ok, then I find the three wires coming up from the the main pcb to the crt base panel and swap over the green/red and see if the color cast changes
If yes then its the chip on the main board, If no its on the crt base board, so check values of all the resistors there.
Posted on Jul 18, 2008
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Posted on Jan 02, 2017
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