Request for Help – ASUS G531GW Rev 1.6 – No Power On

[conghuyms]

Request for Help – ASUS G531GW Rev 1.6 – No Power On

Hello everyone,

I need your support with an ASUS G531GW Rev 1.6 laptop.

When I plug in the charger, the battery charging LED turns on, but the board does not power on when pressing the power button.

Here’s what I’ve checked so far:

• Motherboard has been removed for inspection.
• 3V and 5V always-on rails are present (3V/5V_ALW).
• 1.8V and 1.09V at the PCH are present.
• I don’t have the boardview/schematic, so troubleshooting is limited.
• I tried checking the power button signal from the keyboard connector (embedded power button design).
  • Only two pins show voltage:
    • Pin 4 from the left has 2.47V
    • Pin 5 from the left has 3.2V
    • Upon applying power, the measured current consumption is 0.04 A
  • All other pins have no voltage.

I'm unsure what to check next from here. Could this be an EC (Embedded Controller) or PCH issue? Or is there something else I should verify?

Any guidance would be greatly appreciated. Thank you in advance!

[mon2]

Remove all power. Meter in resistance mode. Measure the resistance to ground of each inductor. Checking for low resistance which may indicate a short on that buck regulator power rail. Post any suspects.

[conghuyms]

"I have measured all the inductors as you instructed. Only the GPU and CPU inductors have low readings, but I believe they are still within the acceptable range. Right now, I feel stuck and don’t know where the root cause is. Please help me. Thank you very much."