Sony Trinitron KV35V65 Power Supply dead

[zeno]

Originally Posted by Ampkat

I removed T-605 and put a small 10 VAC voltage on the primaries and it blew my 8 amp variac fuse. Do you think it's bad or is my transformer test not a valid one ? All of the trannys I use operate the same way is there something I'm missing.

Pulled D648 and it won't give me a diode drop like it's open I'm reading 3.8M on ohms reading so It's not shorted but could be bad ?

Good idea BUT switchers run at high freq so if you use at 60hz
it sees a dead short. See if it works with D648 out.
I understand SMPS' are difficult when you have done tube audio. It
was always the hardest thing for me to fix. Some have a wicked high
parts count & near imposable to understand. Add to that Sony is
the only one doing it this way & every one I fixed was an obvious
fix.

You may consider joining repairworld.com. They cover everything
and may help you in your regular work also. Thousands of tips
catagorized by make/model. Also you can post problems.
A few tips will pay for it fast. Dont forget to search similar
models.........

73 Zeno