alienware m11x r3 battery power on problems

[armands0212@gmail.com]

hello everybody.have a problem with m11x,it wont power on only on battery(only flash lights and off) if keep pressing on button after few attempts it not even flash lights and cant start it from psu as well so only solution is disconnect battery and reconnect it and then starts ok with power supply.

if laptop is started with power supply than everything works ok and can disconnect it from power and it runs from battery just fine,so something not letting it start laptop on battery power i guess

updated bios and all drivers and same

battery is ok itself as well as have one more m11x and m14x to test it and on both battery runs perfect


any ideas what is the problem?

thanks

[armands0212@gmail.com]

Re: alienware m11x r3 battery power on problems

oh yes and it powers on from battery if powered back on straight after shutdown,but after some while off it wont power on...

[mon2]

Re: alienware m11x r3 battery power on problems

The mosfets mated with the charger IC need to be reviewed. While they are passing through the voltage to the logic board, you likely have defective mosfets.

Start with, remove all power / no battery.

Meter in resistance mode.

Measure the resistance of each of the 2 x dcin mosfets as follows:

Source (1-2-3) & drain (5-6-7-8)
Source (1-2-3) & gate (4)
Gate (4) & drain (5-6-7-8)

Post each measurement and the meter scale used.

Repeat for the next mosfet.

You will find 3 other mosfets that will be for the battery charging and that connects the battery to the logic board.

Also interested in the measurements of those mosfets which are high side, low side and battery mosfets.

One or more of these is leaking. The measurements will tell us which one is defective.

No power when checking the resistance values.

ps: see a number of different logic boards for your model so just picked one but the idea of testing is the same. You should see 2 x mosfets near the dc adapter connector -> start there. NO POWER -> RESISTANCE checks on the pins.

[armands0212@gmail.com]

Re: alienware m11x r3 battery power on problems

Hi Mon2.Thanks for quick response and nice detailed explaining .i didnt have time today to get back to it but i will spend some proper time on it when my shift at work finishes.thanks again for reply and i will update how it goes as soon as i get to it

[armands0212@gmail.com]

Re: alienware m11x r3 battery power on problems

ok turned out it was just faulty rtc battery what was causing troubles to start laptop from battery.alienwares and they little tricks sometimes can surprise