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Check your grounding, prob have used illumination line as ground, when lights switched on it goes to 12 volts and if connected to radio ground fuse will pop. Ground radio to chassis and isolate the wire you have used, replace fuse (probably blown) and should fix your problem.
Your old radio had at least 2 power wires, some had 3. One of them stays hot all the time for the clock and radio presets, the second is hot when the key is turned on. And the third is hot when your dash lights are on. If you get these mixed up when replacing the radio, you will have this problem. Most of the dash lights on a GM are under the taillight fuse. I would check them all with a test light. Make sure you are not powering your radio from this circuit. You don't want to dim your radio.
THE LIGHTS INSIDE THE RADIO TO LIGHT THE FACE ARE LED LIGHTING CHANCES ARE YOU WILL NOT BE ABLE TO REPAIR THESE FOR THEYARE PART OF A PRINTED CIRCUIT BOARD AND THATS A LOT OF TROUBLE TO GO THRU WITH THE PRICE OF RADIOS TODAY