This happened to me when I hooked up the batteries backwards last year
Ours took only the 4 screws through the front bezel, and there was a "pico fuse" in the rear of the radio.
Lesson; carry extra fuses! (we changed ours at the camp site because I'm a nerdy boy scout
2013 Passport 3220BHWE, upgrade axles, Kumho Radial 857's, all LED, TST507 TPMS, Reese DCSC, DIY corner stabilizers
2012 Ram 1500 Sport crew cab, Hemi, 4x4, 3.92 LSD, factory brake controller, S&B CAI w/scoop, Moroso air/oil can, 87mm ported/polished/knife-edged throttle body, Magnaflow exhaust, 180* t-stat, Rear lowered 2", Airlift 1000.