1986 Fisher television

[zchrisz1986]

Originally Posted by zeno

First there are 2 grounds. One is the primary ( hot ) of the SMPS & the
other the chassis ground. gotta use the right one or voltages
will be wrong.
If the 2 lines ARE from the set its 120 cycle hum & most likely a cap
on the primary side.

Zeno

thanks Zeno

i got rid of those two hum lines. the service manual tells me exactly which two test points to check. which i get ~88 volts manual says 111v.

i tried the heat gun trick near the octocoupler and the b+ goes down as well as the voltage to the octocoupler. manual says 40v in but i'm getting 32v.

i wonder if it's one of those error modules which i cannot seem to find.