FPW50-LA-H321P(R) REV 1A no power

[kalilinux25]

LAPTOP BORD MODEL : FPW50-LA-H321P(R) REV 1A
REV 1A
2019-02-025
PROCESSOR : SR3W0 (Intel Core i3-8130U)
NVIDIA Graphics chip nVidia NN16S-GTR-S-A2 (GeForce 940MX)
PROBLEM: Wont power on
History , wont power after replacing new LCD
NOTE: Cant find any schematic and BOARDVIEW

BQ24725A

ACN - 20V
ACP - 20V
CMSRC - 19.9V
ACDRV -25.9V
ACOK -0V 2k resistance to gnd
ACDET - 2.7v
IOUT - 0V -14k resistance to gnd
SDA -3.0V
SCL -3.2V
ILIM -0V
BATDRV-3.1V
SRN- 3.1
SRP -3.1V
GND-0V
LODRV-0V -194k resistance to gnd
REGN -6.0V
BTST -5.8V
HIDRV -3.1V
PHASE - 3.1V
VCC -19.8V

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

I found something similar ,

https://www.badcaps.net/forum/showthread.php?t=105849
.

[mon2]

Re: FPW50-LA-H321P(R) REV 1A no power

What is the brand of the laptop?

If it is a Dell, check the ps_id circuit.

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

its an hp sir

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

Im just using a dc supply

[mon2]

Re: FPW50-LA-H321P(R) REV 1A no power

What is the current draw of your power supply?

To announce the power (watts) of the external power adapter, HP need a predefined analog voltage on the center pin of the DCin connector.

This voltage is different than the main 19v used to power the logic board. There are charts of this voltage available on the internet. Each different voltage range = different power of the adapter.

With your dc power supply, this voltage is likely missing.

This adapter ID voltage is sampled by an analog to digital converter on the EC (stand alone 8051 microcontroller) and then the EC decides if the power adapter is capable of powering the logic board. If the expected adapter voltage is missing, the logic board will remain off.

Dell does something similar but will use a single wire identification device that must send to the EC a host of data bytes to inform the EC that a power adapter of xx watts is attached.

Summary - use only an approved and known good HP power adapter for further testing.

Also test without the LCD.

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

What is the current draw of your power supply?

To announce the power (watts) of the external power adapter, HP need a predefined analog voltage on the center pin of the DCin connector.

This voltage is different than the main 19v used to power the logic board. There are charts of this voltage available on the internet. Each different voltage range = different power of the adapter.

With your dc power supply, this voltage is likely missing.

This adapter ID voltage is sampled by an analog to digital converter on the EC (stand alone 8051 microcontroller) and then the EC decides if the power adapter is capable of powering the logic board. If the expected adapter voltage is missing, the logic board will remain off.

Dell does something similar but will use a single wire identification device that must send to the EC a host of data bytes to inform the EC that a power adapter of xx watts is attached.

Summary - use only an approved and known good HP power adapter for further testing.

Also test without the LCD.

Thabks for the will informed data sir, i will do my best to note it to my self so if I always encounter this issue again it wont be a problem, thanks sir hope I can get a good quqlity charger

[mcplslg123]

Re: FPW50-LA-H321P(R) REV 1A no power

Today i was working on a HP Quanta G7AL r2G motherboard. This mb doesnt work with dc supply(PS_ID used). With original 65W HP Adapter, it works. So do always check newer models HP with original HP Adapter before being sure its a dead unit.

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

Today i was working on a HP Quanta G7AL r2G motherboard. This mb doesnt work with dc supply(PS_ID used). With original 65W HP Adapter, it works. So do always check newer models HP with original HP Adapter before being sure its a dead unit.

Thanks for sharing your thoughts and experience about this sir great help.

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

Today i was working on a HP Quanta G7AL r2G motherboard. This mb doesnt work with dc supply(PS_ID used). With original 65W HP Adapter, it works. So do always check newer models HP with original HP Adapter before being sure its a dead unit.

Hi update regarding about the unit , ive found that the +3VALW is shorted it has 1.3 ohms, and also the PLM1 has low restance also 300ohms.

I tried to rremove the PJ302 jumper to determine which part is shorted, after that the +3VALW was shorted and I tried to pump voltage around 0.9v if something gets hot so after that the PCH gets warm,.

Those PCH is dead due to the accident of LCD change?

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

remove jumper of PJ1002 pin 2 has 10.2 ohms
remove jumper of PJ302 pin 2 has 10.2 ohms

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

set to 1v 3amps then inject on PJ302 pad 2.. then check if pch or components thats getting hot..

This is gets warm, not hot.

[mon2]

Re: FPW50-LA-H321P(R) REV 1A no power

Check the resistance to ground of the nearby coils. They power this component. No power in resistance checks.

[kalilinux25]

Re: FPW50-LA-H321P(R) REV 1A no power

Check the resistance to ground of the nearby coils. They power this component. No power in resistance checks.

NOTE: PJ302 and PJ1002 remove

Test
PLG1-+VCC_GT - 62OHMS
PLZ1- +VCC_CORE - 52OHMS
[COLOR="red"]PLA1- +VCC_SA 66OHMS
[COLOR="red"]PLB1- +19VB_CHG 1.4Mohms