Battery is not charging despite SMC reset
The laptop will boot/run fine on a charged battery. It will NOT boot from the charger alone, nor will it charged a battery that is plugged in. Already tried resetting SMC and replaced DC-in board and charger.
This is a water damaged laptop (Received in that condition), that has been cleaned of corrosion, dried, etc.
Verified on other machines that the battery, DC-in board, ram, charger, etc all work.
The system WILL boot from charger ONLY when by-passing SMC.
I am not familiar with testing a board with a multimeter but checked the fuse next to the DC-in board and got a reading of 0, with the charger plugged in. I am confused since I thought that meant all power to the board is shut off by that main fuse, however, i get positive readings on the meter at other random places on the board.
I looked at the power-architecture pdf of the system as well and not sure what to make of the circuitry.
Not sure where to go from here. Thanks in advance.
Okay, wasn't sure how to post a screen shot onto my comment so i uploaded it online. Link: http://s27.postimg.org/qgvdtt4ur/photo_1...
This picture is of the laptop booted up from a charged battery AND with the AC adapter plugged in.
this is the laptop running on battery from coconutBattery 2.8
If your up to it this is what I would do:
Start by testing and if needed replacing the comparator (U7901 - TLV341 SOT563). It tests the batteries charge working with SMC and then switches the FET.
Then look at the FET (Q7950 - SSM6N15FE SOT563) which is the switch that sends the current to the battery from the charger Vs the system alone.