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Toshiba l750 shuts off when ac adapter used randomly. Fine when only battery used

I got the schematic and will look around the power management chip for battery charging and selecting of ac or bat power for Vin.
Any ideas where exact failure points could be for this type of problem.
Very specific. When only battery, laptop works fine.
When ac regardless of with battery or not, shuts off. 
Tried 3 different chargers, same problem.
Gotta be battery management power select chip, right? or some capacitor nearby or dirty connection nearby.

let the fault finding begin.