15SBGV2D-6050A2548101-MB-A02 short battery

[ivangserrano]

hello


my laptop hp 15SBGV2D-6050A2548101-MB-A02 does not turn on right now.

If you make a direct connection from the first mosfet source to drain, it turns on, but if you put the battery in, a short circuit appears in the source.

Turns on and works perfectly just connected to the battery and connected to the charger but both (battery and charger appears short circuit in the source and the first mosfet heats up and starts to smoke. (this without the first mosfet)

If you put the first mosfet, the gate oscillates between 5v and 15v, sometimes 17v appears and I can turn on the computer.

I have already changed the input mosfets, the secondary and the load ic and even then it does not work and always presents the same problem described above.

The mosfets that I changed for the load and input and secondary mosfets and the switch are not original, they are the a5 vng n channel I think it will not be for that reason right?

I await tips.

swapped mosfets

Q6010
Q6011
Q6012
Q6000
Q6001

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

1) remove the ~4k resistor @ R6018. Do not lose this part.

2) Power up and measure the voltage to ground @ ACDRV pin # 4. What is the measurement?

3) Measure the voltage to ground of REGN pin # 16. What is the measurement?

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

1) remove the ~4k resistor @ R6018. Do not lose this part.

2) Power up and measure the voltage to ground @ ACDRV pin # 4. What is the measurement?

3) Measure the voltage to ground of REGN pin # 16. What is the measurement?

Hello

without resistor 6018.

ACDRV pin 4 - 22.30v 23v oscillating
REGN pin 16 - 6v


I tested it after a few minutes and now I have pin4 with 7.5v and pin16 with 6v

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

Appears that the charger IC is able to boost the voltage ok to enable the mosfets.

Remove all power and meter in resistance mode.

Measure the resistance to ground of the drain pins on Q6011 = main power rail (PVBAT). What is the resistance ? If it is low, then the main rail is shorting somewhere.

Check the resistance across the mosfet pins @ Q6011. Need to check if it is leaking.

Measure the usual:

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.

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

Appears that the charger IC is able to boost the voltage ok to enable the mosfets.

Remove all power and meter in resistance mode.

Measure the resistance to ground of the drain pins on Q6011 = main power rail (PVBAT). What is the resistance ? If it is low, then the main rail is shorting somewhere.

Check the resistance across the mosfet pins @ Q6011. Need to check if it is leaking.

Measure the usual:

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.

source (1-2-3) & drain (5-6-7-8) - 4.3k - red source black drain
source (1-2-3) & gate (4) 120k going up and a oscillate - red source black gate
gate (4) & drain (5-6-7-8) 148k going up and a oscillate - red gate black drain

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

Measure the resistance to ground of the drain pins (5-6-7-8).

What is the measurement ?

The readings are low and this mosfet may be leaky. You can remove it and measure the resistance of this part while it is on your work table to confirm.

After this part is removed, are the readings of the other mosfets higher than reported earlier ?

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

Measure the resistance to ground of the drain pins (5-6-7-8).

What is the measurement ?

The readings are low and this mosfet may be leaky. You can remove it and measure the resistance of this part while it is on your work table to confirm.

After this part is removed, are the readings of the other mosfets higher than reported earlier ?

Measure the resistance to ground of the drain pins (5-6-7-8) - 3.1k

I changed the mosfets for new ones and still the same problem remains.

curious that the notebook turns on with the battery inserted, but if it has a battery and a charger, it shows a short circuit in the source.

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

You still have a leaky mosfet in the circuit.

Remove all power and review the resistance across the mosfet pins for:

Q6000

and also

Q6012

Post your measurements.

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

You still have a leaky mosfet in the circuit.

Remove all power and review the resistance across the mosfet pins for:

Q6000

and also

Q6012

Post your measurements.

6012
source (1-2-3) & drain (5-6-7-8) - 45k - red source black drain
source (1-2-3) & gate (4) - 47k red source black gate
gate (4) & drain (5-6-7-8) - 51k - red gate black drain

6000

source (1-2-3) & drain (5-6-7-8) - 42,7k - red source black drain
source (1-2-3) & gate (4) - 28.9k- red source black gate
gate (4) & drain (5-6-7-8) - 161k - red gate black drain


the ACDRV pin 4 now -1.2v 2.7v oscillating is normal??

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

Each is a suspect with the low resistance values.

Carefully remove q6000 (aka high side charging mosfet) off the board. Then measure the resistance of the battery mosfet again.

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

ACDRV should be ~25v under normal operation. Fault may be from a leaky q6000 or the battery mosfet. Start with q6000 removal.

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

ACDRV should be ~25v under normal operation. Fault may be from a leaky q6000 or the battery mosfet. Start with q6000 removal.

Forget it, I didn't read the message above

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

Each is a suspect with the low resistance values.

Carefully remove q6000 (aka high side charging mosfet) off the board. Then measure the resistance of the battery mosfet again.

removing the q6000 I get the same resistance in the battery mosfet.

It's strange, I measured the mosfets and it shows about 65k from source to drain any of them (q6012, q6011, q6000 and q6001), is it really low resistance in the charging circuit?

I'm thinking of changing the 4 mosfets for new ones and waiting for that to resolve, what do you think? and the q6010 changed too?

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

removing the q6000 I get the same resistance in the battery mosfet.

It's strange, I measured the mosfets and it shows about 65k from source to drain any of them (q6012, q6011, q6000 and q6001), is it really low resistance in the charging circuit?

I'm thinking of changing the 4 mosfets for new ones and waiting for that to resolve, what do you think? and the q6010 changed too?

what I did now:
I changed the 4 mosfets plus the input mosfet too, that is, all, when I connected the charger I got 25v in the ACDRV and it turned on. when I turned it off and tried to turn it back on the ACDRV oscillates between 2v 5v 11v etc etc.... I'm confused as to what it could be...

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

How long did the laptop work ?

Which mosfets have been replaced in the last effort?

Does the laptop boot with a pre-charged battery (only) ? This case will not care about the ACDRV voltage.

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

it worked until i turned it on the first time with the replaced mosfets q6012, q6011, q6000 and q6001) on power only. then I went back to being without acdrv. with the battery connected and no current, the laptop turns on and works fine

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

So with power adapter only, the logic board fails to turn on?

Remove the battery, using the power adapter only, measure the voltage to ground of:

ACDET ; this voltage value is used to define if the adapter is present or not

ACPRES

Post your measurements.

[ivangserrano]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

Acdet 2.7v
Acpress 7v

[mon2]

Re: 15SBGV2D-6050A2548101-MB-A02 short battery

These are good values.

After the ACDRV voltage is low, measure the voltage to ground of each pin on the charger IC. Proceed with caution so that you do not short any of the charger IC pins.

Post your measurements.