Well, it smoked, I didn't actually see flames.
I was adjusting the gain on my Tru, CD playing, engine off, and the screen went dead. As I returned to the pilots seat, I smelled burnt electronics. My nose led me to the headunit.
10A fuse blown. I replaced it, and smoke billowed from the fanguard by the output chips. I quickly pulled the fuse.
I'm sending it in for estimate of possible repair. I'm well past any warranty.
John C.