I have a Sony ICF-2010, one of several classic Sony digital shortwave
radios. (The only thing "wrong" with it is that lacks stereo FM.)

It uses two batteries -- three D cells for the main power, two AA cells for
the clock, control, and memory. One of the contacts for the latter broke
loose, and I had to glue it back in place (using Goop, rather than epoxy),
inserting some plastic shims for support.

When I reassembled the radio, the Power switch had no effect; it wouldn't
turn on. The ICF-2010 is unusual in that the power and antenna connections
are made through spring-loaded contacts to the main board, so that when you
remove the back, you don't tear loose a bunch of fragile connections. I
tried connecting them with jumpers, but still no luck.

Then I remembered the Main Power switch on the left side and checked it. It
was Off.

Duh. Duh, duh, duh.

--
"We already know the answers -- we just haven't asked the right
questions." -- Edwin Land