[SOLVED]820-3462 doesn't see battery

[rob777]

I'm stuck here. I don't know what to measure.
Got a 820-3462 board with not a sceric of water damage to be found under the microscope.
Laptop works fine on cord but battery is always showing an X.
Tried a new battery and a working second hand battery. Same prob.
Power rails exist obviously because it turns on. So SMC? How do I tell if this problem is the SMC or not?
Pretty confused on this one.
Thanks.

 

[rob777]

Bloody excellent! Screw was missing. Took one out another and fixed!
A fkn screw tho..... Ffs.
You sir are a bloody legend!