I'm dealing with a similar issue right now (2017 LT Z/71. Changed out a dead battery and later that day screen went black and no blinker sound. I checked later that evening and all was magically working again but the next morning black screen with no audio the hour drive to work. I pulled the radio fuse #18 (passenger side) put back in and all good again, however the next day again black screen. Today I pulled the neg on battery, turned headlight switch on (to drain capacitors) and left unhooked for about 20 minutes. Hooked the battery back up turned key on let computer reset then started and let run for 5 minutes (it gave me the roll drivers window down and back up message on the DIC which resets something. Anyway everything works for now... We'll see if it lasts.
I'm dealing with a similar issue right now (2017 LT Z/71. Changed out a dead battery and later that day screen went black and no blinker sound. I checked later that evening and all was magically working again but the next morning black screen with no audio the hour drive to work. I pulled the radio fuse #18 (passenger side) put back in and all good again, however the next day again black screen. Today I pulled the neg on battery, turned headlight switch on (to drain capacitors) and left unhooked for about 20 minutes. Hooked the battery back up turned key on let computer reset then started and let run for 5 minutes (it gave me the roll drivers window down and back up message on the DIC which resets something. Anyway everything works for now... We'll see if it lasts.