This is what I observe

• If I plug in the charger, the blue battery light is stable
• Absolutely nothing happens when pressing the power button: no fans, no lights, no beeps, nothing

I am comfortable with a screwdriver and own an Ifixit pro toolkit so I can get pretty much anywhere, but I have not been able to find any schematics online for this motherboard, and although all ports are labeled, most labels are just some letters and numbers, and not actually informative. Acer and their service partners probably have a list for that, but I wasn't able to find it online, so I'm flying partially blind.

I have tried these things:

There are no peripherals connected to the laptop.

• hold the power button for 10, 25, 30, 60 seconds as well as a lot more times for different durations
• remove battery and charger, hold power button for 90 seconds to drain residual energy
• use a multimeter to confirm the battery delivers power (~16.8V, should be anywhere between 14.5 and 17.9v, so that's fine)
• use a multimeter to confirm the charger delivers the appropriate voltage to the motherboard (measured behind the thing where the power socket wire connects to the motherboard)
• use a multimeter to confirm the keyboard connector has power to ground at least at several pins
• use a multimeter to verify the CMOS battery delivers charge (~3v)
• reseat RAM
• reseat a lot of other connectors
• visually inspect entire motherboard, there are no signs of damage to the motherboard, capacitors, or anywhere else.
• short the 1&2 pins on the keyboard connector to ground (separately) to try and force a boot

Nothing I try seems to make any discernable difference to the laptop behaviour.

This is what I'm looking for

I would like some pointers on what else I can test or verify to try and pinpoint the issue. Currently my only remaining guesses are

1) the keyboard is non-functional, and since that contains the on/off button, the laptop can't turn on because of it.

2) the motherboard is toast, but I consider this unlikely because 1) it's never the motherboard and 2) there are no visible burns, leakages or damages anywhere

Does anybody have an idea on:

• how I could eliminate or confirm the keyboard as a cause (preferably without having to buy a new keyboard because those are expensive for a test),
• how I could test/eliminate/confirm the motherboard as a cause
• what other things I could test

Thanks in advance!

⟐ Answer edited August 29, 2026 at 2:59 MST

My laptop isn't charging.

⟐ Edited August 29, 2026 at 0:50 MST

I have already tried the following troubleshooting steps without success:

- Performed a hard reset (holding power button for 30 seconds)

- Attempted BIOS recovery (Windows key + B)

- Researched and reseated the RAM module

- Tested with an external monitor via HDMI (no signal on external display either)

- Checked for error code blinking lights (none)

Since basic recovery and hardware checks have failed, what could be causing this persistent black screen issue, and how can it be diagnosed further?

⟐ Commented August 29, 2026 at 0:34 MST

I’ve a 5 years old HP EliteBook 840 G3 and with an irregular frequency, screen get black with some rectangles within there are snow (like when old TV lost their signal). I’ve heard that some MacBook get same behavior and the problem is in the RAM slot. Could it be possible that my laptop has the same problem? How can I verify and be sure that’s exactly that problem? Can I repair it? Or do I have to replace all the main board?

I checked my RAM with memtest and my SSD with SMART and there were nothing to be alarmed about. I’m running on Manjaro and I found nothing in the log files.

Thank in advance for your help.

⟐ Answered August 28, 2026 at 22:50 MST

I have the same issue but on the E15 Gen 2.

There doesn't seem to be an equivalent document out there (only find user guide). Or my google-foo is failing me.

Does anyone have it or can tell me what is similar / different to this documentation of the p.75?

And the part number would be nice too, then I wouldn't have to open my laptop twice (is daily driver so try to avoid).

Or where did you find it for the P1 here? Couldn't find the model numbers you cited anywhere in the linked document.

Thanks in advance!

⟐ Answered August 28, 2026 at 20:25 MST

⟐ Answered August 28, 2026 at 14:57 MST

• Windows 11 Home
• Version 25H2
• OS Build 26200.8875
• Experience Pack 1000.26100.334.0
• MediaTek Bluetooth adapter
• Bluetooth hardware ID: USB\VID_13D3&PID_3567&MI_00
• Current driver: MediaTek 1.3.17.162, dated 4/25/2024

Bluetooth initially works normally, but after extended use—particularly Bluetooth audio—the adapter stops responding.

I'm using TOZO A1 Bluetooth earbuds. In my latest test, I connected them at 11:20 AM and played audio continuously. Bluetooth stopped working at approximately 12:45 PM, after about 85 minutes.

When it fails, Windows logs:

BTHUSB Event ID 3:

A command sent to the adapter has timed out. The adapter did not respond.

It can repeat several times. For example, on August 17:

• 12:45:31 — Event 3
• 12:51:33 — Event 3
• 12:51:38 — Event 3

Then:

BTHUSB Event ID 17:

The local Bluetooth adapter has failed in an undetermined manner and will not be used. The driver has been unloaded.

After this, Device Manager shows the MediaTek Bluetooth adapter with:

Code 43 — Windows has stopped this device because it has reported problems.

Bluetooth disappears from Windows Quick Settings and Windows reports that Bluetooth is turned off even though the toggle may still appear enabled.

• Multiple normal restarts
• Powering the laptop completely off
• Windows Bluetooth troubleshooter
• Uninstalling/reinstalling the Bluetooth device
• Installing/updating HP drivers and firmware
• Checking Device Manager
• Checking Event Viewer
• Checking power-management settings
• Updating the HP software/firmware components

At one point, uninstalling the device resulted in:

Unknown USB Device — USB Device Descriptor Failure

The Wi-Fi portion of the wireless adapter continues working normally.

I booted Bazzite Linux from a separate blank 1 TB external HDD.

The same laptop, same MediaTek Bluetooth adapter, and same TOZO A1 earbuds worked normally in Bazzite while playing Bluetooth audio continuously. It survived the test without the Bluetooth adapter crashing.

This makes me suspect a Windows driver/firmware/software issue rather than a physical Bluetooth hardware failure.

Windows is currently using:

oem87.inf

with:

MediaTek 1.3.17.162

I also found another MediaTek Bluetooth INF in the Windows Driver Store that explicitly supports my exact hardware ID:

USB\VID_13D3&PID_3567&MI_00

located at:

C:\Windows\System32\DriverStore\FileRepository\mtkbtfilter.inf_amd64_4e18fe2e122d5d00\mtkbtfilter.inf

I haven't changed to that package yet because I'm trying to determine its exact driver version first.

What could be causing the MediaTek Bluetooth controller to consistently hang after extended Bluetooth audio use in Windows 11 25H2, while the exact same hardware works reliably under Bazzite Linux?

I'm particularly interested in whether this points to a MediaTek driver/firmware issue, Windows 11 25H2 compatibility problem, or another software-level issue, and what the safest next troubleshooting step would be. (p.s. this is a summary of an insanely long thread with ChatGPT)

⟐ Answer edited August 28, 2026 at 11:09 MST

⟐ Answered August 28, 2026 at 9:34 MST

⟐ Answered August 28, 2026 at 8:13 MST

Thanks

⟐ Answered August 28, 2026 at 6:13 MST

can i fix it without replacing all the case?

Is it possible.

⟐ Answer edited August 27, 2026 at 23:23 MST

The problem is that neither the built-in keyboard nor any external USB keyboards (tested in multiple ports) respond at this screen, making it impossible to press F9 or Esc. I have already tried:

- Hard power resetting and using the emergency reset hole

- Trying different USB ports

- Disconnecting the main battery and coin-cell (CMOS) battery for 10+ minutes to reset the BIOS state

Despite these steps, the prompt remains and input devices are completely dead at this BIOS/TPM screen. What could be causing input failure at the pre-boot stage on this model, and how can this be resolved?

⟐ Commented August 27, 2026 at 20:25 MST

⟐ Answered August 27, 2026 at 15:43 MST

How do I fix this?

⟐ Answered August 27, 2026 at 15:37 MST

⟐ Commented August 27, 2026 at 13:02 MST