Hi,
Initially the only easy user action possible is to check/clean the battery contacts/terminals.
If still a no go, you need to check for any loose or open wiring from the battery compartment to the PCB. That would mean opening the unit and having a look & see inside. You need to be familiar with electronic components and circuitry, DVM and possibly a soldering iron. You need to look/check the power switch, voltage regulator, reverse protection diode, zener diode, fuse/fusiblelink-resistor, open foil/trace and any other components associated with the power supply/regulation.
If this does not solve the problem, your best bet would then be to seek the assistance of a qualified communications technician.
Hope this be of help/idea. Pls post back how things worked out or should you need additional information.
Good luck and kind regards.
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