DIYbanter - RCA PTK169 chassis repair help

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November 9th 13 06:55 PM

RCA PTK169 chassis repair help

I have a CTC169PGA chassis that died suddenly. I replaced the chopper transistor (Q4101) and regulator IC (U4101). When in standby, I am getting 14-15 volts on CR4118 but nothing on CR4116 (B+). Does this mean the supply is working and there is a short on this line (HV splitter maybe or CR4116 bad)? Or could this still be a power supply issue?

Jack

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November 9th 13 08:47 PM

RCA PTK169 chassis repair help

Sounds like 4116 is open. The old 243646. I use the same diode for 4118 actually.

That power supply operates in like a "burst" mode when turned off. It will not go into "run" mode without horizontal drive.

The rectifiers can check good on an ohmmeter and be bad.

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