Lenovo Ideapad 320-15IKA NM-B452 not charging battery

[mon2]

Re: Lenovo Ideapad 320-15IKA NM-B452 not charging battery

Reflash the bios and post your updates and details of the bios that works with the other system.

So the laptop CAN charge the batteries if 2 cell. Not if 3 cell.

You are testing with the battery pack that is open and working with raw battery cells and a the BMS board inside the battery pack? If yes, that is very dangerous to do.

[rookieme]

Re: Lenovo Ideapad 320-15IKA NM-B452 not charging battery

I made a new bios dump from the lenovo site just to be clean but it didn't fix the battery charge issue.
This laptop is unable to charge any battery, either 2 or 3 cells.
A similar model can change all the batteries so the batteries are not to blame.

No I haven't dismantled any battery, I do that only for scap batteries to get cells for projects.

Thank you for your time, it seems we have checked all the suspected parts but with no luck.

I upload the blank clean bios I cut from lenovo site for anyone that might need it.
DMI data at block 234000, length 2000

[Sephir0th]

Re: Lenovo Ideapad 320-15IKA NM-B452 not charging battery

It is hard to remotely troubleshoot a physically damaged board without getting one single picture of the actual damage.

[rookieme]

Re: Lenovo Ideapad 320-15IKA NM-B452 not charging battery

ok, this time I have some photos too.
So far I have replaced again the PU301, both dc-in mosfets and the KBC.

First picture shows the PU301 area with the new lines at the shunt resistor.

Second picture shows the board at the other side of PL302 which has a lift [where the green solder mask is]

Third photo shows probably what caused the issue, it has burned lines from the lan and a lift at the spot there...

[aegeanxtr]

You must see 25V on the ACDRV Bro. Change PQ311.

[NICOCARVAL]

Hello everyone. I'm having a problem with a LENOVO IDEAPAD 320. The 20V voltage isn't showing on the switching MOSFETs.

NM-B321 REV 1.0

It turns out they had a jumper between the PJ101 and PJ201. I then checked to see if the BQ24780S charger IC might be shorted. I replaced it, but the problem persists. The MOSFETs aren't shorted! It won't turn on with the charger. The other thing I noticed is that it turns on with the battery in, but it doesn't charge. I'm confused. Please help me.

[mon2]

Connect the power adapter. Carefully measure the voltage to ground of each pin on the first mosfet.

source (1-2-3)
gate (4)
drain (5-6-7-8)

post each voltage measurement for a review.

Next logic request is to carefully measure the volts on each pin on the BQ charger IC. Post the measurements with their PIN number and pin function. The datasheet from Texas Instruments is a great reference guide for this review.

[NICOCARVAL]

Hi friend, I measured the first MOSFET as mentioned.

SOURCE: 0V
GATE: 0V
DRAIN: 20V

Regarding the BQ24780S integrated circuit, these are the measurements:


vcc: 20V
ACDET: 2.6V
CMSRC: 0V
ACOK: 3.3V
SDA: 3.3V
SCL: 3.3V
BATDRV: 0.8V
REGN: 6.0V
ACIN: 20V
ACP: 20V



It's worth mentioning that if I remove the jumper after the two MOSFETs, they both start working and switch.

Thank you for your help.

[mon2]

Remove the jumper and any hacks on the board. When in normal mode, what is the gate voltage if this first mosfet? It should be ~25v to enable. The same on the gate pin of the 2nd dcin mosfet to enable. Otherwise, these mosfets are suspects and could be shorted. Test their resistance without any power to the board.

Measure:

Source / Drain
Source / gate
Gate / Drain

Each resistance should be hundreds of k ohms or higher else may be defective. Test both dcin mosfets and post their measurements.