Question about Panasonic Projection Televisions

3 Answers

Panasonic Model CTP27805F 27 inch Color Television I have a Panasonic Colored Television Model CTP27805F. It is approximately 15 years old. The television was operating perfectly until about a month ago. Suddenly with no prior indication the Color quit working. It continues to have a excellent Black and white picture. Several questions: #1 What is wrong? #2 Is it worth fixing by a expert? #3 I am fairly capable of replacing a part, if that is all that is wrong. Is it something I can repair? Respectfully, Benjamin J. "Joe" Browning

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  • Benjamin J. Browning Jul 19, 2008

    Hello,

    From the solution I received on Response #1. It appears this is outside of my level of expertise. Which brings me to the next question. Is it worth fixing?

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Hi,

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.

Thank you for using FixYa.

Posted on Jul 19, 2008

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Http://myweb.accessus.net/~090/how2adj.html

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

  • Mark Gil
    Mark Gil Jul 19, 2008

    Since your television work for a long period of time already having it fix is good but since you will also be paying a repair guy for this I may suggest you to get a new television instead, but if you really want to use this unit go ahead and let a repair guy fix it for you..



    Good luck.........

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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

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 18, 2008

    crt

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 18, 2008

    "save picture as" to another location and use ZOOM IN utility to have a better view.

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