Given the voltage is high (14.5 vs 12.7) on one side of R950, perhaps one or more of the diodes upstream are shorted? Or maybe another bad cap (or multiple) in the area, given it's 30 years old?

 

I've got a 30 year old Sony STR-DE310, which stopped powering on. I've opened the case, and done basic checks- 120v ac is reaching the unit. I haven't checked any voltage otherwise...I don't know how, but have a dmm.

There is one capacitor that has sticky brown leakage on its top, C950 on a board with IC950, labeled "reset".

The service manual for model DE305 is available, and I grabbed an image. View attachment 363311

C950 is circled in red. I need to replace at least that cap, but I need to get to the underside of the board first. How do I disassemble the blue circled part?

How does one fix this? Is there a good reference?


View attachment 363313

Replace this capacitor

 

Replace this capacitor

Did that. Powers on now, but a relay clicks and it goes into protection mode right away.

 

I ordered a better DMM which will check capacitance. My plan is to check diodes and caps starting just downstream of the transformer, since it seems to be a power supply issue?