820-3115 power on start 3sn stop

[borderhunter]

this is history little water damage
I clean but battery connetted power on start fan 3 second stop
But adapter Connected is working

 

[Gurmon]

Resistance between pin 17 & 18 on U7000 ?

Is battery detected in OSX ?

 

[dukefawks]

Usually sense resistor issue around U7000. Check R7021/22/51/51 and traces.

 

[larossmann]

quarter fan on this will be the r7051/r7052 section of the current sensing circuit