I changed my battery this morning. The old one was toast. Put in a Deka 778DT.
The swap was fine. Nothing abnormal about it. But when I went to drive the truck the radio didn't work. The screen doesn't come on. The buttons don't light up when I turn on the headlights. The buttons DO come on for 4-5 seconds when I hit the power button. Also, the display does function when pressing the CD buttons:
https://www.youtube.com/embed/G46K9J9jXMM
I checked the fuses under the hood, the radio fuse and the amp fuse, and both were good. I doubt I shorted anything out (unless the radio itself fried somehow), and I'm certain all the cables were put back where they're supposed to be. So it's puzzling.
I should also mention that I have an iSimple iPod interface plugged into the back of the radio, but that's been there for years and hasn't caused me any grief.