• HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

It is currently 26 June 2025, 19:35

HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

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#21 Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by matic • 16 June 2025, 07:53
What is the rated power of your power supply that you used to test the laptop with?

Re: Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by Google Adsense [BOT] • 16 June 2025, 07:53

#22 Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by valieromarco • 16 June 2025, 18:28
I have an original hp PSU 2,4A and laboratory PSU 10A
I know the original is 3,4A
Is it possible to insert a resistor to emulate original 3,4A PSU?

#23 Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by matic • 18 June 2025, 08:10
valieromarco wrote:I have an original hp PSU 2,4A
This power supply is too weak.

valieromarco wrote:Is it possible to insert a resistor to emulate original 3,4A PSU?
Yes, of course. Use 330kΩ resistor to simulate a 90W power supply and it should be fine.

#24 Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by valieromarco • 20 June 2025, 00:27
After connecting right PSU problem is the same, also with battery connect.
No power led no charging led.
Led on motherboard was blinking, now is switched off

#25 Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by matic • 20 June 2025, 10:03
Repeat the following measurements with 90W Hp power supply (or the laboratory power supply with 330kΩ resistor on the ID pin).
Measure the voltages to ground on listed pins:
- On pin 2 of capacitors C4707, C4710, C4808, C4804 (this capacitor is not soldered).
- On pins 1, 2, 4, 5 of chip PU8102.
- On pin 5 of charger chip PU8200.
- On pins 4, 6, 9, 10, 13 of chip PU8601.
- On pins 6, 8, 9, 11 of chip PU8602.
- On pins 1, 3, 5, 6, 9, 14 of chips PU9500, PU9501, PU9502.

#26 Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by valieromarco • 23 June 2025, 02:43
C4707= 1,2V
C4710 = 0,5V
C4808 = 3,3V
C4804 = 3,3V

PU8102
pin 1 = 3,3V
Pin 2 = 3V
Pin 4 = 3,3V
Pin 5 = 3,3V

PU8200
pin 5 = 3,3V

PU8601

pin 4 = 3V
pin 6 =1,68V
pin 9= 5,1V
pin 10 = 3,3V
pin 13 = 8,49V

PU8602

pin 6 = 3,3V
pin 8 = 6,9V
pin 9 = 3,6V
pin 11 = 3,3V

PU9500

pin 1 = 5,1V
pin 3 = 0V
pin 5 = 3,3V
pin 6 = 3,3V
pin 9 = 3,3V
pin 14 = 0V

PU9501

pin 1 = 3,3V
pin 3 = 0V
pin 5 = 0V
pin 6 = 3,3V
pin 9 = 0V
pin 14 = 0V

PU9502

pin 1 = 1,8V
pin 3 = 0,32V
pin 5 = 0V
pin 6 = 1,8V
pin 9 = 0V
pin 14 = 0V

#27 Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by matic • 26 June 2025, 10:09
Measure the resistances to ground on pins 3, 9, 14 of chip PU9502.

Measure the voltages to ground on the following pins:
- On pin 5 of chip PU9200.
- On all pins of chip U1600.
- On all pins of transistors PQ8008, PQ8011.

Transistors PQ8008, PQ8011 pinout:
Image

Re: HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

by Google Adsense [BOT] • 26 June 2025, 10:09
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