84 GE 25PM-C Color console problem

[zeno]

Not sure what the +36 feeds but prob vert or tuning voltage.
Most likely Y932 shorted, note there is not the usual low ohm
resistor used as a fuse. Also the 2 'lytics possible also.
I got the training manual at least & will pull it tomorrow
& have a look what it feeds.

73 Zeno

[jg6364]

Originally Posted by zeno

Not sure what the +36 feeds but prob vert or tuning voltage.
Most likely Y932 shorted, note there is not the usual low ohm
resistor used as a fuse. Also the 2 'lytics possible also.
I got the training manual at least & will pull it tomorrow
& have a look what it feeds.

73 Zeno

Yeah, My gut feeling is it's something in the tuner module. I swapped the entire chassis from the other TV. I used the same stereo board and tuner module. The problem was the same and the same part got really hot.
What about the relay driver in the tuner module?


Thanks

Jeff

[Findm-Keepm]

The 36V source feeds the tuner and the audio output. Your problem probably lies in one of three things - a shorted device at the powers supply, or a short in the tuner or audio amp. Very few components to check - I'd start with Y932, C937-939, and then pull the audio output to see if the audio is pulling the 36V down if not, it is most certainly the tuner.

Cheers,

[jg6364]

Originally Posted by Findm-Keepm

The 36V source feeds the tuner and the audio output. Your problem probably lies in one of three things - a shorted device at the powers supply, or a short in the tuner or audio amp. Very few components to check - I'd start with Y932, C937-939, and then pull the audio output to see if the audio is pulling the 36V down if not, it is most certainly the tuner.

Cheers,

thanks
I checked c937-939, all good. I will go back and check y932 , and then go from there.

Jeff

[zeno]

Originally Posted by jg6364

thanks
I checked c937-939, all good. I will go back and check y932 , and then go from there.

Jeff

If its the diode use the right one. ECG552 IIRC the regular
diodes overheat & short at 15khz.
For the tuner there will be a resistor then a 32V zener to ground.
Suspect that. If audio the output IC almost a sure thing.
I will pull the manual later..

73 Zeno