Anybody Have experience with alienware? LA-C912P rev 2. plugged in not charging.

[drewrox2009]

I have been fussing with this one, for a bit.
2 replacment batteries,
flashed bios.
known good power adapter.

On boot the bios indicates that the battery has experienced failure.
in windows the battery shows very little info in battinfoview, but windows reports it at 100% charge.
will not boot with battery only
powers off if power adapter is unplugged

uses bq24780S as a charging chip.
im getting 3.3v on acok

19.1v vcc
19.4v acp
19.4v CMSRC
25.2v ACDRV
2.6v acdet
0v IADP

33mv battpress
3.3v TB_STAT
220mv BATSRC
250mv BATDRV

no charge indicator lights.
no voltage at battery connector pins when battery is plugged in with new or previous battery.

 

[dukefawks]

No power coming from the battery would either be another bad battery or a short on the main battery bus.

 

[drewrox2009]

Don't these dell "Smart" batteries also require a signal from the board to actually turn on the actual battery power. I am not seeing any short on the battery bus. and this is the second battery i have tested on this computer.

 

[dukefawks]

I have no idea. Usually there is 1 pin that needs to be pulled down to enable the battery output.

 

[drewrox2009]

Cool Thank you! I couldn't find that information, But i didn't know where to look without a schematic for this board.

 

[peterfixit]

Cool Thank you! I couldn't find that information, But i didn't know where to look without a schematic for this board.

same place we get apple schematics

 

[drewrox2009]

ive looked, and id be happy to pay, but i couldn't track one down for this laptop.

 

[peterfixit]

then its probably not worth fixing if it takes more than visual inspection and a diode mode test