The pin with the short across the fuse sounds like it's FUBAR. I've tried to fix that before. Take the fuse out and the short is gone. Replace it with a brand new one, and it's back.

I have a friend who's job many years ago was fixing cheap imported electronics from Japan, back when Japan was still known exclusively for junk/cheap electronics. The main repair method was having a known working one in front of you taken apart and compare with the broken one. Often the problem was a simple assembly error on the circuit board.

He remembers many times how the boss man would point to a resistor and say "that is why it is broken, it is in backwards". Sadly, many of the repair "technicians" did not know any better and would flip them around. Not surprisingly, turning the resistor around did not fix the problem very often.