OMEN 16 does not turn on, no indicater lights when turned on

[Colin170]

OMEN 16 xf0033dx suddenly shut down while plugged in and using it. Unable to get computer to power back on. No lights, fans, or beeping observed, even when charger is plugged in.

Some things I have tried:
 - Verified charger works with a multimeter
 - Held power button for 1 minute while on battery and plugged in
 - Removed battery and tried to power on
 - Removed RAM and tried to power on
 - Removed battery, held power button for 1 minute, reinstalled battery, plugged in, and attempted to power on
 - Removed SSD and tried to power on
 - Plugged laptop in while power button was being held, both with and without battery

No voltage difference is seen between ground and power rails on the motherboard (N44885-601), both while on battery and plugged in. Battery is confirmed to be sufficiently charged via a multimeter.

Computer has previously had an issue where it had a black screen but would power on, but this was resolved by disconnecting the hall effect sensor. 

[Hawks_Eye]

Hi @Colin170 

Welcome to the HP Support Community! We're here to help you get back up and running.

Thanks for detailing everything you've already tried—it’s clear you’ve been methodical and thorough, and I can imagine how frustrating it is to face a complete power failure with no indicators or response. Based on your steps and hardware-level checks, this points to a deep board-level fault or power gating issue, possibly triggered by a short or failed component.

Here’s a focused set of final checks you can perform before considering deeper disassembly or board-level diagnostics:

1. Inspect the DC Jack and Power Rail Entry

Even if the charger shows voltage, the internal jack or rail may be loose or damaged:

• Use a flashlight to inspect the DC input jack for bent pins or looseness.
• Gently press the jack while plugged in and watch for any flicker or LED response.
• If you have access to the board, trace voltage from the jack to the first MOSFET or fuse.

2. Disconnect CMOS Battery (if accessible)

Residual charge or corrupted firmware can block startup:

• Disconnect the main battery and locate the CMOS coin cell or embedded RTC battery.
• Disconnect it for 5 minutes, then reconnect.
• Reinstall the main battery and try powering on.

3. Remove All Peripherals and Modules

A shorted component can prevent power-on:

• Remove SSD, RAM, Wi-Fi card, and any connected USB or HDMI devices.
• Leave only the motherboard, CPU, and power input connected.
• Try powering on with just AC adapter and no battery.

4. Inspect for Board-Level Shorts

Since you’ve already checked voltage rails:

• Use continuity mode on your multimeter to check for shorts across key power rails (e.g., 19V, 3.3V, 5V).
• Pay special attention to areas near the CPU VRMs and charging IC.

5. Try External Power Trigger (if board supports it)

Some boards have a power-on pad or test point:

• If you can identify the power button trace or test pad, short it briefly with tweezers while plugged in.
• This bypasses the physical button and can help isolate a failed switch.

If none of these steps yield any response—no fan spin, no LED flicker, no voltage rise—it strongly suggests a board-level fault, possibly in the power delivery IC, embedded controller, or a shorted rail. 

Let me know if you have access to schematics or boardview for N44885-601, and I can help you trace specific components for further testing.

If my response helped, please mark it as an Accepted Solution! ✅ It helps others and spreads support. 💙 Also, tapping "Yes" on "Was this reply helpful?" makes a big difference! Thanks! 😊

Take care, and have an amazing day!

Regards, 

Hawks_Eye

[Colin170]

Hello Hawks_Eye,
Thank you for your answer.
1. I have tried several of the procedures you have brought up:

I have had some difficulty measuring for voltage on the DC Jack Itself as my multimeter cannot be properly used with the current of the charger. I will look into alternatives soon.

While the battery is plugged in, I am observing ~3.3V between a positive terminal of the battery and the laptop ground. Battery voltage measures 12V when not installed in the laptop. No voltage is measured between GND and SW0-IO, XRES, SW0-CLK, or VDDD diagnostic pins.

I have been unsuccessful in tracing any voltage between components. Perhaps having a schematic of the motherboard would help; I have been unable to find one.

No fuses are blown, from what I have been able to tell through continuity testing.

2. There is no CMOS battery on this device. I believe it uses the main battery for CMOS functions.

3. I have tried powering on with the motherboard disconnected from all peripherals through both AC and battery power. No response.

4. I have been unable to observe any shorts.

5. Where could I find this External Power Trigger on my board? I cannot find any information on this.