Don't be mis-led by the working display. I had the "no power" problem with a working display too. I measured the voltage of the two AA batteries. One was 1.33 volts and the other was only 0.76 volts. Replaced the weak AA and everything worked. I suspect the 'enable' circuitry fails around/below 2.1v.
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Your set is not switching on and you will need to check on the power switch on circuits. Have to check if the battery voltage is going to the porcessor , please check around this stage for any signs of dry/bad soldering, use a low wattage iron to touch on , but be very careful , use a multimeter to probe the voltage in the circuit hoping to find a damaged component.check the crystal freq input. test the signal track and move on. if not your processor could be defective. I hope i could help. Good day
If its not a micro-p glitch, sounds like the radio was subject to a spike or surge wile plugged into the AC adapter. If the "power" light stays on all the time, thats what happened. Believe me, I was Sangean America's tech from 1990-1995. Rob The fix is to replace a transistor, or fet in the main pwr supply. (Close to where the adaptor plugs in.) I wish I could give more details, but its been 14 long, long years.
Remove the battery compartment door and the batteries. There should be a small hole marked "reset" under the upper battery cradle. Press (gently...until it clicks) and hold for 5 seconds. Replace batteries and try again.
Make sure no other buttons are held down when powering up, although you usually see a clock on the display if there is power but the unit is locked up for another reason.
The fact that you've tried batteries and you've tried the PSU suggests to me that there is some other problem with the radio, it could be as simple as a dry joint, but without experiencing the same problem myself it's not possible to suggest anything further.