Re: HP EliteBook 840 G2 power problem

Thanks

It's indeed a shorted mosfet (Q6051) after testing the resistance between gate & drain there was only a few ohms (not dead short, but shorted enough that the source was only 4v instead of 12v)

It was very hard to unsolder, it's entirely soldered underneath and there is a very small 10k resistor just next to it

Re: HP EliteBook 840 G2 power problem

Sorry for hijacking but I have a problem in the same circuitry, for me the laptop turns on with the adapter and shows battery charging etc but when disconnected it shuts off and doesn't turn on just on battery. The battery is good with 12v voltage but probing PBPACK is at 4v everywhere after Q6051 which I'm guessing is the issue

For some context there was a shorted cap (C6010) which I removed (didn't replace yet as I don't have 10uf 25v on hand) but which shouldn't be a problem if it's not present

This short likely...