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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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I have a phillips 29 inch tv(model PT4423) which lost power suddenly.
After replacing a shorted chopper transistor in the switching circuit and two open resistors the TV came back to live with another problem. When ever a picture is pumped into the TV's AV sockets the picture shrinks vertically before shutting down. Further attempts to on the tv after that is not possible, unless the power is recycled. I've replace the main filter capacitor, main bridge rectifier, output regulator, PWM ic and a few zener diodes but the problem is still there. Next I plan to replace the opto-coupler. What do you think is the problem? Could there be a problem with the deflection circuit? Thanks-a-million. |
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