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you might look for a bad solder joint in the VCO,PLL, and audio IC areas. over the years I have seen so many radios with bad solder joints and ever dirty controls on the front of the radio.

had a lot of the Superstar 121 radios to come in with bad solder joints from some of their last production models. I have 2 right now with a dead issue like you are having and need to go over the solder joints.  since they started acting up for the owners with a work no work problem. one the guy said he could turn the power switch on a few times and it would work for most of the day.