Hp -15bs199nl not charching

[arber1232]

hello how are you .... i have a laptop hp 15bs199nl which does not charge. When I put the power supply, the dc light turns orange but the laptop does not charge. I thought it was the battery, but luckily I have another laptop like that and I realized that the defect is the board. I changed the 8q25a ic charging but no change anything ..

I see that this laptop has the same charging scheme as the hp 250 g6, the scheme I found in this forum, I made some measurements but I don't understand where the defect is.
I am also uploading the scheme, if you help me tell me where to make the measurements. 19 Vin is ok laptop turn on with battery
With charger and battery input voltage in PL13 PL14 is 14.4 v



voltage in ic charger + battery
20=vcc-19.43v
19=Phase 14.41 v
18=hidrv ov
17=Btst 14.13 v
16=Regn 6v
11 Badrv 14,39

[mon2]

Re: Hp -15bs199nl not charching

See attached.

Attach the power adapter. Meter in DC volts (20V or higher) scale.

Red meter probe to pin to test.
Black meter probe to ground.

Measure the voltage to ground of each requested test point (#1..5).

Often the 2nd DCin mosfet gets damaged and has to be replaced but perform these checks to confirm the details.

[arber1232]

Re: Hp -15bs199nl not charching

See attached.

Attach the power adapter. Meter in DC volts (20V or higher) scale.

Red meter probe to pin to test.
Black meter probe to ground.

Measure the voltage to ground of each requested test point (#1..5).

Often the 2nd DCin mosfet gets damaged and has to be replaced but perform these checks to confirm the details.

I explain in photo voltages

[mon2]

Re: Hp -15bs199nl not charching

Replace PQB12 mosfet.

[arber1232]

Re: Hp -15bs199nl not charching

Replace PQB12 mosfet.

what voltage will I have after the change?

[mon2]

Re: Hp -15bs199nl not charching

The fault is that the GATE voltage is not = DCin + REGN = ~25 volts.

Respectively, the gate voltage is 19v. For N-channel mosfets, the GATE voltage has to be HIGHER than the voltage passing between source & drain pins.

You have 19v on both sides of this mosfet (source & drain) so the mosfet is leaking if the gate is also 19v.

Remove all power / no battery.

Remove the series 4k resistor on the ACDRV pin and power up. Do not lose this 4k resistor.

Power up again with the adapter.

Do you see now ~25 volts on ACDRV pin? That is expected as the normal gate drive voltage. It has to be a boosted voltage for the N-channel mosfets to enable.

With 19v on the gate, you should have 0 volts on the drain side of this mosfet since the mosfet should be OFF.

[arber1232]

Re: Hp -15bs199nl not charching

i change but is same voltage 19.33v

[arber1232]

Re: Hp -15bs199nl not charching

The fault is that the GATE voltage is not = DCin + REGN = ~25 volts.

Respectively, the gate voltage is 19v. For N-channel mosfets, the GATE voltage has to be HIGHER than the voltage passing between source & drain pins.

You have 19v on both sides of this mosfet (source & drain) so the mosfet is leaking if the gate is also 19v.

Remove all power / no battery.

Remove the series 4k resistor on the ACDRV pin and power up. Do not lose this 4k resistor.

Power up again with the adapter.

Do you see now ~25 volts on ACDRV pin? That is expected as the normal gate drive voltage. It has to be a boosted voltage for the N-channel mosfets to enable.

With 19v on the gate, you should have 0 volts on the drain side of this mosfet since the mosfet should be OFF.

I remove 4k resistor now i see on pl14 and pl13 voltage is 15,34v myabe now laptop charching

[mon2]

Re: Hp -15bs199nl not charching

If you have removed the 4k resistor and you still have voltage on the drain of the 2nd mosfet then the DCin mosfets are leaking. They should be OFF if the gate voltage is not ~25 volts.

Start with replacing the 2nd mosfet and check if the drain pins are now 0 volts. It should be 0 volts since the gate voltage is missing.

It is possible that the first mosfet is also defective but start with replacing the 2nd mosfet.

Q: What is the voltage to ground of ACDRV without the 4k resistor ?

[mcplslg123]

Re: Hp -15bs199nl not charching

Check if PQB1 is defective. Most often it fails in this platform.

[arber1232]

Re: Hp -15bs199nl not charching

If you have removed the 4k resistor and you still have voltage on the drain of the 2nd mosfet then the DCin mosfets are leaking. They should be OFF if the gate voltage is not ~25 volts.

Start with replacing the 2nd mosfet and check if the drain pins are now 0 volts. It should be 0 volts since the gate voltage is missing.

It is possible that the first mosfet is also defective but start with replacing the 2nd mosfet.

Q: What is the voltage to ground of ACDRV without the 4k resistor ?

when i change pqb12 and remove 4k resistor laptop charching ok now . Acdrv without 4k resistot is 19.73 v . but laptop charching ok now
In drain 2nd mosfet i have 19.08 v

[arber1232]

Re: Hp -15bs199nl not charching

Check if PQB1 is defective. Most often it fails in this platform.

i change before but is same not charching

[mcplslg123]

Re: Hp -15bs199nl not charching

when i change pqb12 and remove 4k resistor laptop charching ok now . Acdrv without 4k resistot is 19.73 v . but laptop charching ok now

Surprising for me.

[mon2]

Re: Hp -15bs199nl not charching

PQB12 is still a suspect. The voltage must be going through the internal body diode.

What is the voltage to ground of ACOK (pin #5) of PUB1 ?

Remove all power -> meter in resistance mode.

Measure the resistance across the 2nd mosfet pins (PQB12):

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

Also, ACDRV should be ~25 volts if the 4k resistor is removed. Have you replaced PUB1 (BQ Charger IC) yet ? It may be defective if REGN = ~6 volts.

With the 4k resistor (PRB9) connected & ACDRV ~19v -> PQB12 should be OFF.

[arber1232]

Re: Hp -15bs199nl not charching

PQB12 is still a suspect. The voltage must be going through the internal body diode.

What is the voltage to ground of ACOK (pin #5) of PUB1 ? 3.3 v

Remove all power -> meter in resistance mode.

Measure the resistance across the 2nd mosfet pins (PQB12):

source (1-2-3) & drain (5-6-7-8)---- 330 k ohm
source (1-2-3) & gate (4) 2.1 ohm
gate (4) & drain (5-6-7-8) 335k ohm

Also, ACDRV should be ~25 volts if the 4k resistor is removed. Have you replaced PUB1 (BQ Charger IC) yet ? It may be defective if REGN = ~6 volts.

With the 4k resistor (PRB9) connected & ACDRV ~19v -> PQB12 should be OFF.

i replplaced pub1


a clarification so that we are not misunderstood, I am working with the HP 15bs199nl model, maybe the scheme changes a little. But now the laptop seems fine and is charging ok without 4k resistor

[mon2]

Re: Hp -15bs199nl not charching

What is the voltage to ground of

ACOK (pin #5) of PUB1 ?

SCL ; pin # 9
SDA ; pin # 8

[arber1232]

Re: Hp -15bs199nl not charching

what is the voltage to ground of

acok (pin #5) of pub1 ?

scl ; pin # 9
sda ; pin # 8

acok 3.3 v

scl 3.3v

sda 3.3v

[mcplslg123]

Re: Hp -15bs199nl not charching

I'm puzzled as well as baffled by this case. How can ACDRV be 19V without 4K resistors in place?? So, to me either charging IC and/or PQB12 is defective.

@arber1232, dont deliver the laptop to customer in such a state, as there may be consequences unknown. May cost you your reputation.

@mon2, I want to know if PQB12 is passing voltage in diode mode(which i also beleive), how battery can charge?? Do you have any clue?? Honestly, i dont have one.

PS: I'll still bet for PQB12 shorted between S-G pins.

[arber1232]

Re: Hp -15bs199nl not charching

I'm puzzled as well as baffled by this case. How can ACDRV be 19V without 4K resistors in place?? So, to me either charging IC and/or PQB12 is defective.

@arber1232, dont deliver the laptop to customer in such a state, as there may be consequences unknown. May cost you your reputation.

@mon2, I want to know if PQB12 is passing voltage in diode mode(which i also beleive), how battery can charge?? Do you have any clue?? Honestly, i dont have one.

PS: I'll still bet for PQB12 shorted between S-G pins.

@mcplslg123 no not sent laptop in costumer becouse i test now and laptop charching and cut off ..
I am surprised that pbq12 pin 123 with pin 4 has 2.2 ohm... maybe they are in same line ?
i change pqb12 with 7406 mosfet

[arber1232]

Re: Hp -15bs199nl not charching

PS: I'll still bet for PQB12 shorted between S-G pins.[/QUOTE]
yes

when i remove 4k resistor laptop chrching with it battery not charching