• HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

It is currently 26 June 2025, 19:33

HP Probook 450 G8 mobo DAX8QAMB8D0 REV D dead

 Forum rules: Click here to view the forum rules

  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
  3. Before posting a new topic please read all topics in TRAININGS subforum and make a preliminary diagnostic based on the content of those trainings.
  4. Uploading of any complete schematics, BIOS / firmware files or any other kind of documentation, or linking to 3rd party websites with such files, is STRICTLY PROHIBITED. You can only upload the small portion of documentation or, link to BIOS file on UNVERIFIED BIOS FILES subforum, which simplifies the diagnostics/repair. You are not allowed to upload more then one complete page of instruction/schematic per single topic. The file you upload must not contain any watermarks, "confidential" markings, links or email addresses and cannot be password-protected.
  5. It is only permitted to describe one faulty device per single topic - you should always open a new topic for each subsequent device.
  6. Requesting of the full schematics, BoardView files, BIOS files or any other kind of documentation is NOT ALLOWED in this subforum. If you need to ask for any of these, you should open a new topic in DOCUMENTATION/BIOS REQUEST subforum.

#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
Similar Topics
  HP ProBook 450-G2 LA-B181P ZPL40/ZPL50/ZPL70 No power  [SOLVED]
  HP ENVY K206NL mobo DAY11AMB6E0 Rev: E no power on  [SOLVED]
Laptop HP Probook 440 G10 DA0X8TMB8E1 rev.E identyfikacja elementu
  ASUS FX504G motherboard DABKLGMB8D0 Rev: D dead  [SOLVED]
  HP Probook 440 G9 - zwarcie  [SOLVED]
  HP ProBook 4540s - brak dźwięku  [SOLVED]

Who is online

Users browsing this forum: No registered users and 4 guests

_______________________________
All rights reserved. Unauthorised copying of this website's content or any of its part is strictly forbidden.
Any trademarks, brand names, products or services published on this website belong to their legal owners, are copyrighted and used for information purposes only.