Ideapd 5 15ITL05 wont charge battery

[alfredosn]

Hello friens , i have a Lenovo Ideapd 5 15ITL05 wont charge battery, so i have these escenarys


laptop with battery and charger plugged.... laptop power on but wont charge battery and no detect the ac adapter

laptop only with ac adapter plugged .... laptop power on but wont charge battery and obvuisly no detect the battery

laptop only with the battery plugged .... laptop power on but wont charge battery and obvuisly no detect the ac adapter

does somebody has a working bios dump for this laptop, the MB is NM-D211 Rev 1.0

[Sephir0th]

Re: Ideapd 5 15ITL05 wont charge battery

Start with checking the DCIN mosfets for being internal shorted.

BIOS request goes into another category here iirc

[alfredosn]

Re: Ideapd 5 15ITL05 wont charge battery

The laptop and motherboard power on with the adapter, so i dont think this problem is related to DCIN mosfet, you rigth, bios request is in another category

[Sephir0th]

Re: Ideapd 5 15ITL05 wont charge battery

That's a interesting attitude. Good luck by solving your fault.

[Stevedb]

Re: Ideapd 5 15ITL05 wont charge battery

Hi like Sepiroth said check the dcin mosfets if the second mosfet is shorted between drain and source then will pass the 19v and the laptop will work on the adapter bit will not work on battery and will not charge the battery. See the beginner guide from Piernov.



Regards

[jared101]

Re: Ideapd 5 15ITL05 wont charge battery

The laptop and motherboard power on with the adapter, so i dont think this problem is related to DCIN mosfet, you rigth, bios request is in another category

I just fixed a Lenovo with the same symptoms as yours. It was a bad DCIN mosfet causing the issue

[korsar86]

In my case, replacing the input transistors didn’t help- the laptop still doesn’t charge the battery.
Without the battery, the USB-C tester shows 20V, and the laptop turns on automatically.
With the battery connected, the voltage briefly goes up to 20V for a few seconds, then drops to 5V.
A new battery has already been installed.
LID_0D_SW# and ACIN signals are 3.3V.

[mon2]

Review the mosfet linked to the battery path. This is the mosfet that enables to power the logic board when the power adapter is not present.

[korsar86]

Review the mosfet linked to the battery path. This is the mosfet that enables to power the logic board when the power adapter is not present.

I forgot to mention that I already replaced the batt-FET, if that's what you mean.

[quic307]

I was having the same issue and I changed the first mosfet and worked.
When I measure the faulty mosfet was right but wouldn't worked correct.

[mon2]

Remove all power. Meter in resistance mode. Place one meter probe at pr310 and other at pr312. What is the resistance in ohms? Testing the full path resistance for the battery charge leg of the circuit.

[korsar86]

Remove all power. Meter in resistance mode. Place one meter probe at pr310 and other at pr312. What is the resistance in ohms? Testing the full path resistance for the battery charge leg of the circuit.

20 ohms

[korsar86]

I was having the same issue and I changed the first mosfet and worked.
When I measure the faulty mosfet was right but wouldn't worked correct.

I replaced both of them first; the problem is not with them.

[mon2]

Measure the voltage to ground of each pin on the charger ic and post in a list with labels for a review.

[korsar86]

Should I replace the BQ25710?

[korsar86]

Measure the voltage to ground of each pin on the charger ic and post in a list with labels for a review.

1 vbus - 20-5-0-20-5-0
2 ACN - 20-5-0-20-5-0
3 ACP - 20-5-0-20-5-0
4 chrg_ok - 3.25
5 OTG - 0V
6 ILIM - 2.15V
7 VDDA - 5.94V
8 IADPT - 0.28V
9 IBAT - 0
10 PSYS - 0
11 PROCHOT - 0.2V-0V-0.2V-0V
12 SDA - 3.27v-0v
13 SCL - 3.27v-0v
14 CMPIN - 0
15 CMPOUT - 0
16 comp1 - 1.28V-0V
17 COMP2 - 1.06V-0V
18 CELL_BATPRESZ - 4.45V-0V
19 SRN - 12.3V-3V-12.3V-3V
20 SRP - 12.3V-3V-12.3V-3V
21 BATDRV - 2.4V-0.4V
22 VSYS - 12.3V-3V-12.3V-3V
23 SW2 - 4.9V-0V
24 HIDRV2 - 6.95V-0V
25 BTST2 - 10.7V-0V
26 LODRV2 - 3.45V-0V
27 GND
28 REGN - 5.95V-0V
29 LODRV1 - 4.12V-0V
30 BTST1 - 9.2V-0V
31 HIDRV1 - 9.2V-0V
32 SW1 - 9.2V-0V

I took measurements with the battery
The voltage fluctuates

[korsar86]

Should I replace the BQ25710?

mon2
20 Ω between PR310 and PR312 on the BQ side is not acceptable, correct?

[mon2]

20R ohms is ok since each resistor in the path is 10R ohms.

Remove all power. Meter in resistance mode. Measure the resistance across the 2nd dcin mosfet:

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

post each measurement in ohms.

[korsar86]

20R ohms is ok since each resistor in the path is 10R ohms.

Remove all power. Meter in resistance mode. Measure the resistance across the 2nd dcin mosfet:

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

post each measurement in ohms.

534 kΩ - source (1-2-3) and drain (5-6-7-8)
megohms - source and gate (4) and gate and drain

[mon2]

Looks ok. Attach only the battery. Then measure the voltage to ground of the battery. Next, measure the voltage to ground on each leg of the DCin mosfets. No power adapter should be connected. What are the voltages on the source / drain / gate pins of the DCin mosfets? Checking if there is a leakage here.