At a loss...HP 15-ac190ca often won't turn on...

[Darkstrike]

I am at a loss.

I have an HP 15-ac190ca notebook I am trying to fix for friend. I have been trying to fix it for MONTHS. I have now replaced the motherboard, the battery, the cardreader/USB/power lights mini board and its ribbon cable, the entire top panel/keyboard, the entire lower panel, the power button board and its ribbon cable AND the hard drive...and the problem still persists! The only things that have not changed are the screen assembly and the power plug.

It randomly does not turn on!!!! Sometimes it turns on, and once it's on, it works perfectly....but often the power button does nothing! This happens whether it's ONLY on battery, if it's ONLY on wall power (with no battery installed) or if the battery is installed AND it's plugged in, so it can't be the battery or charger...

I have tried it with different RAM, with no RAM and with only one stick of RAM (various sticks) and it STILL does this. It can't be a motherboard issue because it has an entirely different motherboard now...can't be a hard drive issue as it has an entirely different hard drive now....can't be a short in a USB port or something because new motherboard/new cardreader board (where the other USB port is).

My friend uses it in his shop as an engine diagnostics computer, so it has to be reliable...I am at a loss, what the heck could be preventing it from turning on at random?

[praveen196]

@Darkstrike Welcome to HP Community!

I understand that the laptop will not turn on.

Please perform the below steps and check.

Hard Reset:

1) Shutdown the computer.  

2) Unplug all the Adapter and peripherals connected.  

3) Remove the Battery. ( not for Built-in Battery computer ) 

4) Press and hold down the power button for 15 to 20 seconds.  

5) Plug-in the Adapter and put the Battery back into the computer if it's a (removable battery)

6) Try to turn on the computer and check, If the issue persists continue next step

Set BIOS default and restart:

1. Restart your notebook.
2. During startup, press F10 repeatedly until the BIOS menu is displayed.
3. Once the BIOS menu is displayed, press F9 to restore factory defaults.
4. Select Yes to confirm.
5. Press F10 to save changes and exit.
6. Select Yes to confirm.
7. The computer restarts using the default settings.

Please perform the below steps on the computer to run a System Test

- Shut down/Turn off the computer

- Once the computer is completely Shut down/Turned off

- Now press the power button once to turn on the computer and immediately start pressing/tapping the F2 key on the keyboard

- This should open the UEFI Diagnostic screen on the computer

- Please select System Test and then select Extensive Test

Please let us know the test result.

Keep us posted,

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