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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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CTC169 36" dead
Got this set, it would turn on and fire HV for a second, then shut back
down. it wont do it anymore, only did it one time. I monitored C4118 while pressing the button, it would start off at 13.1 volts, and drop down to about 5 volts. when power button was pressed. I then replaced CR4118, and replaced 2 caps in the IC chip of the power supply. the main B+ at standby levels is about 143vdc. the 15v standby is about 13.3 still. but this time, when you press the power button, OR perform the manual power-on, bypassing the micro unit, the voltage doesnt drop anymore, but the set still is dead. HOT is fine, chopper is running. I dont know what to look for next. however if i hold the board in manual power on, every once in awhile the degauss relay would start clicking on and off a little bit, very faintly, like a weak supply somewhere. any ideas? |
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