Mine did the same thing about a year after i bought it. it has been a while sense i repaired it so ill try to help. I noticed a lot of heat coming off of the radio around the regulator transistors located on the top board in the back. 5 and 8 volt regulators they have the single tab at the top with one screw. again i can't remember if it was on the voltage side or the regulated side but there are caps on the regs and i found that the voltage was way down due to these caps being shorted. if you have a print it will be evident as the which ones i am referring to. I just removed them and the display came on. but there was other problems and i tracked it down to a crystal on the control board under the top board. The crystal is a 8.xxx mhz and i didn't have that frequency there it was way off due to what i think was a bad crystal . i couldn't find one so i bought a board from a working radio on ebay for $25.00 plus shipping. that fixed it. they say it is a good idea to recap these radios because of their age.
Hope this helps
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