How do you fix H2 Hummer radio display light when radio works?

The problem is reported on many web sites. The power supply board for the display gets to warm and melts some of the solder connections. You will need to remove the radio from the dash. Remove the display panel from the radio and the top cover panel. When facing the front of the radio, there is a small board on the left side of the radio. It is held in place by two bendable tabs, one at the front of the radio and the other in the circle in the metal housing (both are in an area of white paint). You will also need to remove the screw in the rear heat synch. At this point, the board will be lift up easily. With a magnifing glass find any cracked or bad solder joint and touch it up. Be careful, the SMD are not glued to the board so they can slip when the solder is hot. Good luck.