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My set would shut off then restart by itself after a few minutes.

I have a 1996 Panasonic CT-27G31U, chassis AEDP272
My set would shut off then restart by itself after a few minutes. After doing this a few times it quit altogether. The low voltage regulator and horizontal transistors were replace and it ran fine for over a year. Then it started going off and on again and then quit altogether. The capacitors and transistors were replaced and it ran for a few weeks and started the same routine. The third time the caps and transistors as well as the fly back were replaced. Again it lasted about a week and repeated the process. Now it is going on and off sometimes after 10 or 15 minutes or it may run for a few weeks. So far it has not quit altogether. The technician is uncertain what to do next. Has anyone experienced this or anyone have any suggestions as to what to try next?

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  • William Snow
    William Snow Aug 24, 2009

    I did not see any reference in the manual I was able to secure through the local public library. Parts replaced to no avail were a BA 2508D transister, an AS01 and RF3FS diode, a F04508F Transformer and four capacitors. No of these solved the problem The last part replaved with what should have been the most obvious was the relay. This was also about the cheapest part. The set has run since June without a problem.

    I still have received no emails from you.

    William Snow



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I do not have service manual of this particular TV yet I can give you hint to check X-ray protection port that activates and turns TV down after few minutes operation.

Reason of this port activation can be devalue resistance in related circuit or over screen volts. X-Ray protection pin can be located on Horizontal / Vertical Osc (Jungle) drive IC.

If you have service manual copy in PDF file, you can email me at as attachment so I will be in better position to assist you.

Hit "add a comment" button for further query / info.

Posted on May 19, 2009

  • Shahid Electronics
    Shahid Electronics Aug 24, 2009

    Email me schematics of TV at as it was requested before to find out on-off reason in TV.



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