BL_Thompson
TV Repair Authority
Feb 7, 2003, 9:14 PM
Post #2 of 7
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Re: [trinidex] Panasonic CT-20G12V No Picture - Relay Click, hi-pitched scream
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trinidex, it sounds like your flyback is arcing. Turn all the lights off and look carefully around the flyback for arcing. A shorted HOT could also cause the high pitched "scream"... some switched mode power supplies complain loudly when there is a short on the B+ line. You can test for high voltage with an NE2 neon bulb attached to an insulated stick (such as a pen housing). I assume your set is shutting down, so hold the NE2 bulb against the body of the flyback while you turn the set on. If the bulb lights, your HOT is ok, and your flyback is probably the cause of the problem. One other possibility is that the CRT is shorted to HV. If all else fails, remove the CRT socket & see if the symptoms change... just steer clear of the CRT pins. If the CRT is shorted to HV, you'll have 20KV on those pins! BLT ----------------------- Bryan Thompson Spyder Byte Services Albuquerque, NM
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