custom autosound radio

[mshirey]

Having trouble with my custom audosound radio (USA6). It worked for quite some time and then started working intermittently. Finally it stopped working at all with no sound and no digital display. The green backlight comes on and I can hear the pop when the radio turns on. Also can hear a hum through the speakers when the volume is turned up. I checked all the connections and fuses to ensure connectivity and no shorts. The ground was checked. Even tried a jumper to the battery neg with no change. Any thoughts on what could be wrong would be appreciated.

Thanks
mike