Lenovo G500S vilg1/g2 LA9901P battery related problem

[ravi_1617]

Hi!
Laptop works fine with adapter power, without battery.
As soon as I connect battery ,if it has power ,PU401 starts heating
until o disconnect battery .already replaced pu401 (which was defective)
what is to be checked.

Thanks

[ravi_1617]

Re: Lenovo G500S vilg1/g2 LA9901P battery related problem

No one no ideas ...

[polytek]

Re: Lenovo G500S vilg1/g2 LA9901P battery related problem

first :check PQ312 (AO4407AL) for short and if it get hot
then check the charger ic PU301 BQ24727RGRR pin 10 ILIM pin 1 of pr315=3.3V
if less change PU301.

[1HandyDud]

Re: Lenovo G500S vilg1/g2 LA9901P battery related problem

It seems to be common failure with this platform. I am fixing one now, and it has PU401 blown as well as PL401 destroyed, U39 looking good but suspected faulty or floppy... so keep fingers crossed and parts on the order.

[tomodachi]

Re: Lenovo G500S vilg1/g2 LA9901P battery related problem

It seems to be common failure with this platform. I am fixing one now, and it has PU401 blown as well as PL401 destroyed, U39 looking good but suspected faulty or floppy... so keep fingers crossed and parts on the order.

PU401 produces +3VLP which is also called AUX power for various devices on that platform (audio ic, network ic, Vcrore IC for some platforms, also PCH) See if there is anything shorted on that voltage rail first othervise you will fry new PU401 IC too, good luck