Re: Laptop battery charging circuit

I have a question for a problem with the two n-channel mosfets - which I already replaced to be on the safe side. The BQ24725 emits every 1.3 seconds a very short pulse with an amplitude of approx 11v on the gates of the two N channel mosfets. When does the charge controller go in such a mode ? On battery alone, the mainboard correctly powers up. On the DC jack alone, I get nothing unless I bridge the 1st mosfet. Then the power button starts the laptop. Having both battery and a lab power supply connected to the DC jack won't start the laptop...

Re: Asus X550cc run only when jump first mosfet

Attached scope images of each of the 20 pins of the battery controller....

Re: Asus X550cc run only when jump first mosfet

Have the same issue here with an ASUS N76V v2.2 mainboard.
Have replaced both mosfets with A5 GNE/GNC/GNB like.
AC_DRV gets a pule every 1.3s and at the current shunt, you will see a 19v peak which goes directly down.

It does run fine on a charged battery. When applying DC alone, it draws almost no current (psu says 0.03W every 1.3s).

I'm suspecting the charge pump of the battery controller but no schematics or any sourc e of testpoints is available.