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I had this problem.
For me the cause was the phono plug itself. Inside the plug, two connections have to be made. If one of these connections is missing then the sound cuts completely. I fixed it temporarily by slicing open the plastic outer casing (if you have the stock phono plugs on your techs, you should be able to slide the cover back to check) and resoldering the connections. It worked, but I've got shaky hands so my solder job didn't last long.
I eventually ended up just going to the shop and slamming down $30 to get completely new plugs.
Shiny. Gold. Plugs.
So if you can, see if you can slide back the covering on the phono plug to check the connection. It might have burnt off or snapped with age. I wouldn't suggest slicing it like I did, because that just made a huge mess.
Best of luck to ya. I know your pain.
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