Replacement main board for Developers

[mozes]

Interesting.  It sounds like classic bad RAM or overheat.  Have you tried throttling the CPUs?

The high pitch whine may or may not be normal with the battery disconnected.  I wonder if you had a shorted battery which damaged the power circuit.  You may need to get both a main board and a battery.  (There was a thread here recently about buying batteries).

I wonder if @tllim has a word on a replacement main board.

My guess is bad RAM as well.  I've not tried throttling the CPUs. The machine is stone cold when turned on, yet invariably won't complete booting U-Boot.
I've not been experimenting with the hardware and a fault subsequently developed:  I disconnected the battery because it wouldn't turn on with it connected, then discovered the rest of the faults once I had it booting.

If a replacement board can be provided, I'd appreciate it - without it Slackware won't support the PineBook Pro, and I enjoy using it to develop the project.

Thanks
s.