[TA-A] RCA PTK169PABS(CTC169BT)MOMENTARY 145VOLT STAND-BY VOLTAGE

 Dear forum members,
Have a weird problem. When the chassis is plugged in, the main
145 stand-by voltage doesn't maintain this voltage.  It seems
the SMPS is starting and stopping three times and then stops as it 
should.  Generally this problem is a short on the secondary side of the
smps, but I can't find any.  The HOT is ok, and with the HV splitter 
disconnected I can't get a constant B+ standby voltage, I think
I had disconnected the 145 volt source diode and same problem.

Someone had mentioned replacing the 4 diodes on  the secondary 
side of the smps.  The vertical IC pin 8 is not shorted either.

Any suggestions,
Thanks


 

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