Lenovo G40-80 ACLU3 ACLU4 NM A362 not charging

[mon2]

You cannot measure resistance if the power is on.

Does the laptop turn on with the power adapter? What does Windows show for the battery?

[G_sene]

You cannot measure resistance if the power is on.

Does the laptop turn on with the power adapter? What does Windows show for the battery?

The adapter powers the laptop normally.
The only thing is that the charger icon doesn't appear.

I'll see what CMD tells me about the battery.

The battery also works if I remove the adapter; I even charged it a bit using the power adapter.

[mon2]

Watch this video and test this method:

https://www.youtube.com/watch?v=HV1iWoEstLA

[G_sene]

Watch this video and test this method:

https://www.youtube.com/watch?v=HV1iWoEstLA

I tried uninstalling the driver in the driver manager, but it didn't change anything.
The Lenovo website doesn't show a battery driver for my model.

[mon2]

The Lenovo G40-80 battery driver, also known as the Advanced Configuration and Power Management Interface (ACPI) driver, can be updated or installed by downloading it from the Lenovo support website. You can either manually download the driver from the website or use the "Detect Product" feature to automatically scan your system for the correct drivers.
To manually download and install the driver:

1. Identify your operating system: Make sure you know whether you have a 32-bit or 64-bit version of Windows.
2. Go to the Lenovo support website:Navigate to the Lenovo support page for the G40-80 laptop.
3. Locate the Drivers & Software section:Find the section for drivers and software downloads.
4. Find the ACPI driver: Look for the "Advanced Configuration and Power Management Interface (ACPI) Driver".
5. Download the driver: Download the appropriate driver file for your operating system.
6. Install the driver: Follow the on-screen instructions to install the driver.

To use the "Detect Product" feature:

1. Go to the Lenovo support website:Navigate to the Lenovo support page for the G40-80 laptop.
2. Find the Drivers & Software section: Find the section for drivers and software downloads.
3. Click "Detect Product": Follow the instructions to download and install Lenovo Service Bridge if needed, which will automatically detect your system and find the correct drivers.
4. Download and install the ACPI driver: The website will then display the available drivers, including the ACPI driver. Download and install it.

[G_sene]

The Lenovo G40-80 battery driver, also known as the Advanced Configuration and Power Management Interface (ACPI) driver, can be updated or installed by downloading it from the Lenovo support website. You can either manually download the driver from the website or use the "Detect Product" feature to automatically scan your system for the correct drivers.
To manually download and install the driver:

1. Identify your operating system: Make sure you know whether you have a 32-bit or 64-bit version of Windows.
2. Go to the Lenovo support website:Navigate to the Lenovo support page for the G40-80 laptop.
3. Locate the Drivers & Software section:Find the section for drivers and software downloads.
4. Find the ACPI driver: Look for the "Advanced Configuration and Power Management Interface (ACPI) Driver".
5. Download the driver: Download the appropriate driver file for your operating system.
6. Install the driver: Follow the on-screen instructions to install the driver.

To use the "Detect Product" feature:

1. Go to the Lenovo support website:Navigate to the Lenovo support page for the G40-80 laptop.
2. Find the Drivers & Software section: Find the section for drivers and software downloads.
3. Click "Detect Product": Follow the instructions to download and install Lenovo Service Bridge if needed, which will automatically detect your system and find the correct drivers.
4. Download and install the ACPI driver: The website will then display the available drivers, including the ACPI driver. Download and install it.

I'll test this!

I have a question: shouldn't pin 5 (ACOK) on my BQ be at 3.3V when the adapter is plugged in?
I checked it, and it's zero. It seems the BQ doesn't release a charge if there's no ACOK; it's just recognizing that a charger is connected.

[mon2]

ACOK is ACPRN. ACPRN is pulled up through a resistor to the REGN voltage so this means ACOK should be ~6v when the adapter is docked and is accepted to be OK.

See attached. Confirm you have a pull-up resistor onboard. Confirm that the REGN voltage = BQ24737_VDD is present on the other side of the resistor @ PR325.

REGN should be ~6 volts.

[G_sene]

ACOK is ACPRN. ACPRN is pulled up through a resistor to the REGN voltage so this means ACOK should be ~6v when the adapter is docked and is accepted to be OK.

See attached. Confirm you have a pull-up resistor onboard. Confirm that the REGN voltage = BQ24737_VDD is present on the other side of the resistor @ PR325.

REGN should be ~6 volts.

6v on the side of BQ24737

[mon2]

What is the voltage to ground of ACDET pin #6?

[G_sene]

What is the voltage to ground of ACDET pin #6?

2.61v

[mon2]

The designers at TI are bipolar. On this 737 charger ic, it is ACOK# so this signal will be active low when the adapter is OK. So you are fine here so far.

What is the voltage of PACIN?

[G_sene]

The designers at TI are bipolar. On this 737 charger ic, it is ACOK# so this signal will be active low when the adapter is OK. So you are fine here so far.

What is the voltage of PACIN?

PR309 side of PQ307 5.97v
PR309 side of PACIN 3.55v

[mon2]

Not sure I follow the measurements.

See below.

Measure the voltage to ground of each of the highlighted labels.

PACIN is ~6v?

Post each.

[G_sene]

Not sure I follow the measurements.

See below.

Measure the voltage to ground of each of the highlighted labels.

PACIN is ~6v?

Post each.

Sorry, I just took a better look at the board. The PACIN side is 3.55V, and the 5.97V side is the PQ307 gate side.

ACOFF 0V
BATT_OUT 0V

(Measuring with only adapter connected)

[G_sene]

[mon2]

Weird values.

PACIN is @ 3.55V on PR309 but is 5.97V @ the gate of PQ307? The voltage should not increase at the gate unless someone is leaking.

Flux and remove this dual mosfet. PACIN voltage should be similar on each side of the resistor of PR309.

Do you have more of these dual mosfets?

[G_sene]

Weird values.

PACIN is @ 3.55V on PR309 but is 5.97V @ the gate of PQ307? The voltage should not increase at the gate unless someone is leaking.

Flux and remove this dual mosfet. PACIN voltage should be similar on each side of the resistor of PR309.

Do you have more of these dual mosfets?

I just replaced it, so I now have 3.25V on both sides.
Remember that VIN jumper for PR304? Will I need to keep it? Because I don't have VIN on that resistor yet.

[mon2]

Yes, PR304 requires the Vin voltage.

[G_sene]

Yes, PR304 requires the Vin voltage.

Okay.

So now I need to rewire the PR304 jumper and test if anything changed.

But what's strange to me is that even with the VIN jumper on PR304, the PQ303 gate still stayed low.

[mon2]

Ok. What is the exact voltage on the gate pin of PQ303?

See attached. PQ303 = P-channel mosfet. P-channel mosfets require that the gate voltage be lower than the voltage being passed between source / drain pins to ENABLE.

The resistors mated with the gate pin on PQ303 work together to build a voltage divider to lower the gate voltage. Respectively, when the gate voltage is LOW enough, the mosfet is being requested to be ON to pass the battery voltage onto the main power bus.

This PQ303 should be enabled when the power adapter is removed. Otherwise should be disabled.

When you have BOTH power adapter and battery connected, PQ303 should be disabled. Confirm it.