Re: Sony MDS JE480. Hum.
I have an MDS-JE440 here which works fine but the disc loading and unloading is getting a bit arthritic. If you're getting bad hum, I'd wager that the ground connection on the phono sockets is broken. Double check that you've resoldered the connection to the outer ground contact as well as the inner signal contact. The fact that the connectors had come loose implies that they might have had a knock at some time. There should be a screw holding them to the back panel and providing some support. Is that still present? Check carefully for cracks in the PCB around where the connectors are soldered. If it's had a bump, a crack in the board is very likely. It's pretty fragile.
Chris
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