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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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Problem with D16-III TV chassis
Dear,
I'm in trouble with a Philips television 25DC2060 which has a D16-III chassis. On power-on the television is not working and the frontpanel LEDs are all OFF. I only have part of the schematic drawing and NO service manual. After the mains-rectifier I do measure 280V, but in the secundary of the PSU all voltages are way too low. Even the 5V standby is only giving about 4,3V after the 5V stabalizor, as the input to this stabalizor is only about 6 V. Injecting about 8V in front of the 5V stabalizor (while TV disconnected from mains) gives about 4,9 ... 5V behind it, and this results in the standby LED starting to flash. Shouldn't the fulll 5V standby-voltage always be there, even in case of PSU-protection-mode as otherwise the logic cannot function ? The EHT-transistor seems to be OK and some of the low-voltage taps of the flyback-transfo are giving some output after the rectifier, but again way too low. Any help / suggestions would be highly appreciated as well as a full copy of schematic drawing and/or service-manual. Thanks, Jan |
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