820-3115 wont run off battery

[Gmorb]

system detects and charges battery but wont run off of it.
when i do an smc reset it runs off of it for a short period and on the problem comes back.
when i hold the power button for 5 seconds on startup it boots off of battery fine.

any ideas?

 

[Gmorb]

PPBUS_G3H= 12.56volts
R5280= .505
25281= .506
Resistance 17/18 U7000= 3.3ohm
Resistance 27/28 U7000= 20.4ohm
PPBUS_G3H with battery charged and no charger connected= 11.69volts

 

[Gmorb]

The system had water damage when i got it. the area above the cpu was the most damaged replaced all the components that were barely hanging on to the board that made it turn back on then i ran into that odd battery issue. Holding the power button for 5 seconds on startup makes it work just fine but when i close the lid for longer than 10 seconds and it goes into a sleep state it turns off.

guess ill try replacing isl6259 and if issue continues then ill leave it alone. dont have proper tools to replace smc and seems to me like for the most part its not worth it?

whats your take for this 2012 model.

 

[larossmann]

area above CPU = near the SMC. Check all your traces and components in that area again, and replace the SMC after is what I'd say.