hp 250-g6 \la-e802p no power

[Rekoo1997]

Hello,

I have la-e802p Mainboard
+19V_VIN ok
+19VB not found and ACDRV not found
PRB9 is ok
if connect battery and chrarger the device work on battery
i changed ic CHARGER but same problem

Can anybody let me know what I'm missing?

[mon2]

Re: hp 250-g6 \la-e802p no power

1) Link or post a schematic if available for this mainboard.

2) https://www.badcaps.net/forum/showthread.php?t=90356

3) power down -> remove the battery -> review the logic board -> locate the DCin connector.

Review the usual 2 x DCin mosfets near this connector. What are the markings on these parts ?

Near these parts will be the charger IC with 'BQ' or similar markings.

What are the markings on the charger IC ?

Often the fault you have raised are linked to the DCin mosfets. We need confirm if they are defective or not using resistance checks.

With no power -> meter in resistance mode -> check the resistance of each mosfet as follows:

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 and the scale used on your meter for these tests. If the resistance is low, the mosfet is defective and must be replaced.

[Rekoo1997]

Re: hp 250-g6 \la-e802p no power

all DCin mosfets and chargind mosfet is ok

[mon2]

Re: hp 250-g6 \la-e802p no power

Measure and post the voltage values for:

Vcc pin 20
REGN pin 16
ACDRV pin 4
CMSRC pin 3

for charger IC @ PUB1.

[Rekoo1997]

Re: hp 250-g6 \la-e802p no power

Measure and post the voltage values for:

Vcc pin 20
REGN pin 16
ACDRV pin 4
CMSRC pin 3

for charger IC @ PUB1.

pin 20 = 19.57
pin 16 = 6.08
pin 17 BTST = 5.87
pin 4 = 0.77
pin 3 = 0.77

[Rekoo1997]

Re: hp 250-g6 \la-e802p no power

Can anybody help me

[mon2]

Re: hp 250-g6 \la-e802p no power

1) With no power -> meter in resistance mode -> check the resistance of each mosfet as follows:

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 and the scale used on your meter for these tests. If the resistance is low, the mosfet is defective and must be replaced.

2) Measure the voltage on each pin of the charger IC and post the readings.

[Udemzy]

Re: hp 250-g6 \la-e802p no power

pin 20 = 19.57
pin 16 = 6.08
pin 17 BTST = 5.87
pin 4 = 0.77
pin 3 = 0.77

Since pin 4 is not available then ACOk is not available,in other to generate this you have to follow this steps.

You already changed the charging ic and problem still persist,I believe the charging IC you changed is fine,if yes then check the impedance of ACOK, check the impedance of CMSRC and ACDRV and also check the communication via continuity of ACP and ACN to CLR.

Don't forget to check the impedance of charging MOSFET and discharging MOSFET too.

These are very important to generate ACOK/ACDRV

[Rekoo1997]

Re: hp 250-g6 \la-e802p no power

Since pin 4 is not available then ACOk is not available,in other to generate this you have to follow this steps.

You already changed the charging ic and problem still persist,I believe the charging IC you changed is fine,if yes then check the impedance of ACOK, check the impedance of CMSRC and ACDRV and also check the communication via continuity of ACP and ACN to CLR.

Don't forget to check the impedance of charging MOSFET and discharging MOSFET too.

These are very important to generate ACOK/ACDRV

1) With no power -> meter in resistance mode -> check the resistance of each mosfet as follows:

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 and the scale used on your meter for these tests. If the resistance is low, the mosfet is defective and must be replaced.

2) Measure the voltage on each pin of the charger IC and post the readings.

Thank you my friends
I changed all the charging MOSFET and discharging MOSFET
And the device is working properly