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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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RCA P46730WK PTK169PCA flicker in video, tuner
This one came in with intermittent power, low B+ when not turning on. Found
the 39 uF cap on the chopper bad and the 2.2uF cap on the controller IC high in ESR. OK, that was pretty straightforward. Now it runs ok, except that it starts to flicker when it heats up. When it does, all of the supplies that I have been able to find seem rock solid. Cooling the obvious stuff has no effect. The set previously was serviced for the brown goo from the rubber spacers and the boards were thoroughly cleaned. A few caps in the PIP circuit were changed at that time, and they all check ok now. Now the strange part. Once it starts to flicker, if I turn the set off and back on, it will be fine and never starts again until the set is off for a long while and restarted. When it starts it is fine, then starts to flicker after running up to normal temp. Seems like a cap, but have not been able to find the one that is acting up. Checked the Intrepid, TechAssist files and archives, plus a few more sites and no luck excep some unstable brightness tips for CR2901 but it is not thermally sensitive. Haven't checked for signal there yet as the unit is now running ok. Any ideas? Leonard |
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