Hi Kevin I had pretty much the same sounding fault as you. I took mine to a old school car radio repairers been in business for years and always seem to have the answers. So I'd already pulled the radio out of the car and he then bench tested it, within 30 mins he'd located the fault as basically a failed component I can't exactly recall what it was but it was broken. What he did with mine was use the failed component from a Land Rover radio which he had in his workshop. It was all fixed and perfect within the hour. He charged me £60. I'm not sure whereabouts you are but this repairer is in Bury just north of Manchester, if your not near there try and find someone with the same knowledge as my guy and see if they can do the same. It definitely sounds the same problem. If you need details of where I went let me know. Ian