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To close this thread out, after putting about 10hrs. into investigation and troubleshooting on this one, I decided to junk it and move on. I have too many other projects around the house. I tried disconnecting the different boards attached to the control board with IC357, and PROTECTOR! was...

The UPC2581V ICs and 200mA fuses arrived, so I replaced IC4301, and R4397 and 4398. No dice...the unit still goes into Protector! mode. I've cheked the voltages at IC4101, 4201 and 4301, and they are all at the values outlined in the service manual. So now I'm measuring around the detection...

While I am waiting for the UPC2581V for IC4301 to come in from China, I decided to double-check my findings by comparing measurements for shorts with IC4101. Doing so, I did confirm that I have a short between Pins 15 (VEE) and Pins 14 (VCC), and also Pin 2 (+VOUT1) on my IC4301 - my IC4101 did...

Just for completeness of the information here, IC4301 is a UPC2581V, and the fusible resistors are 10 Ohm, 5%, 1/4W pieces.

I received this receiver some years ago from a friend who said it had broke and he didn't want to try and fix it. It "might" have been damaged due to power issues during a storm, but I don't recall anymore the exact thing he said might have led up to the issue. I've had it sitting around the...