The radio problem is on the FM/Cassette/CD models. The DC to DC power supply board for the display is the problem.
The PCB doesn't have an internal ground plane, and relies on the RF shield to provide ground from one end of the board
to the other. ALL 4 solder tabs for the RF shield were broken on the radio I repaired (and some other fatigued solder joints)
as you can see from the pictures below: