HP-41C with 23A batteries - remedy possible?

[acapde]

The power circuitry is composed of diodes CR1, CR5, CR6, zener CR4, inductance/coil L1, some electrolytic capacitors (470uF, 47uF) and a bipolar 14-pin IC (U2), all these component should be around U2. You should be able to check all the diodes fairly easy with a DMM and the electrolytic capacitors if you have a meter with such feature. Also the coil can be checked with the ohmmeter functionality of the DMM. if all the passive components are okay then I would say the problem might be U2.

Hope this helps.