Power supply problems 15s-eq3028nl

[moorebell]

Today I noticed (on working PC) that the power supply did not charge the battery. the battery then discharged. I tried to start it but without success, the white power LED flashes three times and the notebook does not turn on, the fan does not start and the screen does not turn on. I then checked with a multimeter if the power supply was working and seems to be working properly.
I then tried to disconnect the power supply, unplug the battery and hold down the start button for 15 seconds but after reconnecting the power supply the problem seems to persist. But I did not find a CMOS battery to disconnect.

[Alden4]

Hi @moorebell,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

The issue you're describing with your HP 15 laptop could be caused by a range of problems, including a faulty internal power connection, a failing battery, or motherboard-related issues. Since you've already tried some basic troubleshooting steps, here are some additional steps to help pinpoint or resolve the problem.

Verify the Power Adapter

• Confirm Output Voltage: Although the multimeter indicates the adapter is working, ensure the output voltage matches the specifications printed on the power adapter. Variations may suggest partial failure.
• Try a Different Adapter: If possible, test with a known working HP-compatible power adapter to rule out adapter issues.

Inspect the Charging Port

• Loose or Damaged Port: Check if the charging port is loose or damaged. A damaged port can prevent proper power delivery to the laptop.
• Clean the Port: Use compressed air to gently remove dust or debris from the charging port.

Check Battery Health

• Remove the Battery: If the battery is removable, try booting the laptop with the battery disconnected and only the power adapter plugged in. If it powers on, the battery may be defective.
• Battery Status LED Codes: Review the user manual or HP support site to decode the flashing LED pattern. Three flashes often indicate a hardware issue, like battery or power delivery problems.

Perform a Hard Reset

You've tried this, but ensure the steps are followed precisely:

1. Disconnect all external devices and unplug the power adapter.
2. Remove the battery (if removable).
3. Hold the power button for 30-60 seconds (not just 15).
4. Reconnect the power adapter (without the battery) and attempt to power on.

Look for CMOS Battery (Non-Removable Battery Models)

If the CMOS battery is internal:

1. Refer to your laptop's service manual for the location of the CMOS battery.
2. Disconnect the main battery and CMOS battery (if accessible) for about 10 minutes to clear the BIOS settings.
3. Reconnect everything and test.

Diagnose with External Monitor

Although unlikely due to the lack of fan activity:

• Connect an external monitor to check if the issue is with the laptop's display.

[Alden4]

Motherboard or Hardware Failure

If none of the above resolves the issue:

• Short Circuit on Motherboard: A short circuit may prevent the laptop from starting. A professional technician can check for this.
• Component Damage: A faulty DC-in jack, power IC, or other motherboard component might need repair.

I hope this helps.

Take care and have a good day.

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

Alden4

HP Support 

[moorebell]

Thanks for your response, I had to carry out other tests, below the explanation of the current situation:

I succeeded by holding the power button for 30 seconds and reconnecting it to turn on the laptop.
Now it works properly but still does not receive power, in fact I can turn it on and access windows thanks to the little battery left.
The led no longer blinks, it just doesn’t light up when I plug in the charger.
I tried to update the BIOS but nothing changed.
I also tried with a multimeter both the power supply (which correctly receives 19.5V) and also the pins of the socket on the motherboard from which comes the internal cable of the power supply.
I can then confirm that the power supply is properly supplied to the motherboard port. As mentioned in the previous part, the laptop is powered on by the battery so I think I can exclude the battery. Now I don’t know if the problem is caused by the motherboard, the charging module or some software issue that I ignore.

P.S. in removing the battery for some tests I have consequently also reset the CMOS, several times, so I do not think it is useful to reset the CMOS

[Alden4]

Hi @moorebell,

Thank you for your response, 

I'm sending a private message to assist you with the next action.

Please check your Private message icon on the upper right corner of your HP Community profile Next, to your profile Name, you should see a little blue envelope, please click on it or simply click on this link.

I hope this helps! Keep me posted.

Alden4

HP Support