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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 projection TV repair question - PFR 100
Hi All,
I was able to isolate a fault in the RCA PFR 100 projection TV thanks to a suggestion by James Sweet, The Drive transistor on the Red CRT neck board was shorted out. After replacing it I see the image but looks like the image is horribly out of convergence, but before I attack that problem I need some advice on what I am seeing with the service switch on. There is a switch on one of the control boards to switch the TV to service mode, I figured that in service mode I would see a single horizontal line but what I see is http://www.geocities.com/shroffja/rca_service_mode2.jpg The contrast shows up better without the flash here http://www.geocities.com/shroffja/rca_service_mode1.jpg Can someone help clarify what could cause this behavior, also can someone help me with the convergence tuning sequence. There is a row of 16 pots and maybe there is a way to quickly narrow down the combinations. Thanks Jay |
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