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HP released this ergonomic laptop (model number 15-au123cl) in October 2016. It features Windows 10 and a touch screen.

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Power light lit but black screen

My HP laptop stopped working today. When turned on the power light is lit, but the screen is black. The Caps Lock key light flashes in the following sequence - 5 long and 3 short flashes. HP website shows a possible system board issue. There is nothing displayed when connecting a secondary monitor. Any ideas on how to fix?

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안드로이드 수리 키트

A new screen or battery is one kit away.

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A new screen or battery is one kit away.

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Hi @taf

As you say a 5.3 blink code is a system board problem - “The embedded controller times out waiting for the BIOS”.

Try resetting the BIOS by removing the coin cell RTC battery as well as disconnecting the main battery from the system board.

Here’s a link to the service manual taken from this webpage.

Use it to gain access to the systemboard so that you can remove the RTC battery. (Note the orientation of the battery before removing it so that you put it back in the correct way). Ensure that the main battery has been disconnected as soon as it can be accessed.

Once the RTC battery and the main battery have both been disconnected do the residual battery discharge procedure i.e. hold Power button for at least 30 seconds to hopefully restore the BIOS to default values.

While the RTC battery is out you may as well test it to ensure that it is still OK. If it isn’t replace it.

Here’s the part number for the battery 741976-001

Once you have replaced the RTC battery, re-assemble the laptop (don’t forget the main battery do it as late as possible to prevent any problems while the laptop is still open), connect the charger and try to turn the laptop on.

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Hi @jayeff

Thanks for your post. After disconnecting the battery and removing the RTC battery and reconnecting both the laptop started and the error is cleared. Your solution was clear, concise and resolved the problem. Thank you!!

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Hi @taf ,

You're welcome.

Glad that it resolved the problem.

Apologies for also not mentioning that you would have to reset the time and date (and any other user preferred BIOS settings) afterwards.

Cheers.

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Hi @jayeff,

Actually after rebooting the time and date were still set and the notebook is still working great. I forgot to say thanks for including the link to the service manual. It was helpful to review and I saved it for future use. 5 stars for your help!!

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Have you tried a Hard reset ?

Turn off your laptop.

Remove the power, and the battery

Press and hold the power button for 60 seconds and release.

Put your battery in and plug the charger.

Boot your laptop again to see if it works now.

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The laptop has an integrated battery. Does this change your recommendation?

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