Apple Wireless A1255 successful repair?

Hello guys!

I’ve got a Wireless Keyboard A1255. Year 2011, but its in very good shape - rarely used, never spilled any coffee on it.

But a week ago it ceased to turn on. Replaced the batteries, sometimes they’re too short so I do know that tinfoil ball trick to close the circuit :)

However, its still not turning on.

I’ve checked with teardown//dissassembly tutorials here and have almost completed it.

Most circuits are fine - checked the ohmage with multimeter - but cant check the voltage (because the meter is malfunctioning).

Has any of you had any success with repairing it (unless the logicboard is dead)?

Yes, I can throw it away at any time, but would like to give it some last chance. :)