I had a similar situation with my radio unit after a jump start. The whole right side was dead. I sent the unit (I think bm53) to a fellow in the UK named Baris who worked his magic for a lot less than any replacement I could find, even with int'l shipping. Supposedly upgrades the faulty parts in the process. I know he's been referenced here a few times. Company is called Carphonics. All communications were via email and still working great.

Scott