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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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Hi, my model does not have a removable RTC battery

i have the same issue but i have my laptop running on kde ferin os on a portable ssd tried doing the battery removal but nothing the screen turn on but goes black i think it has to do with the display being broken that’s my only other solution works fine when plugging it to an external display i miss having my laptop functional is there a way to fix it

the laptop is a hp pavillion dv4 1548dx

What if the laptop does not have a battery ypu can take out the power light is on and the caps lock button keeps flashing can someome help please

@celsie_evans ,

What is the model number of the laptop?

sooooo i figured it out my model has the hp logo illuminated when its on... but the back light is broken because it doesn't light up so its nothing major just needs a replacement LCD thanks for all the help <3

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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!!

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.

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!!

What if my model does not have an RTC battery

@Oliver Poulteney ,

What is the make and model number of your computer?

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Hi @Bradfords random channel,

Try shining a torch at an angle close to the screen to check if there are any images at all on the screen when the laptop is on and there are images on the external display.

They will be very faint if they are there so trying this in a darkened room may help.

If you can see images then there is a backlight problem. You would need the schematics of the motherboard to determine whether the problem is on the motherboard, the video cable or in the LCD panel. Try searching online for (insert motherboard ‘board number’) schematics to hopefully find the schematics. If you do find the schematics then if the problem is on the motherboard you may be able to fix it. If it is in the LCD panel then the panel will need to be replaced as it cannot be repaired. If you can’t find any schematics for the motherboard then as a DIY repair all you can do is to replace the LCD panel and check if the replacement works OK

Here’s the maintenance and service guide for your laptop series.

Go to p.91 to view the necessary pre-requisite steps and then the procedure to remove / replace the display assembly.

The procedure will allow you to gain access to the display panel cable on the motherboard so that it can be checked that it is secure and also that it is not damaged where it passes through the hinge to get to the lid etc.

The LCD panel part number is found at the top of p.91.

Search online using the part number only, appropriate to your particular laptop, in the search term of your browser to get results for suppliers of the part.

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could it be due to the fact my dad threw it on a pillow on the floor then kicked it and he could of janked the lcd? ill try that shining a torch

@Bradfords random channel ,

Treating any electronic device in such a manner will definitely not do it much good.

If there are no images at all or even if there are, there's a fair chance that it is the panel that is the problem or at the very least if the lid was yanked that the video cable was damaged where it passes through the hinge to get from the motherboard to the lid.

The connections inside a LCD panel are fragile and you would be lucky if they held up to such treatment.

I'm surprised that the laptop withstood it as well as it did, considering it still functions good enough to be able to use it with an external monitor.

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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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Hi @Ms Mandy,

Your model laptop has not got a RTC battery.

According to this, a 5.3 (blink) pattern indicates a problem on the System board - The embedded controller times out waiting for the BIOS.

You say that “I tried every method. I can't fix this.”, but this doesn’t say what exactly you have or haven’t tried

Have you tried disconnecting the main battery from the motherboard and then pressing the Power button for 30 seconds, to try and reset the BIOS?

If you haven’t:

Disconnect the charger if connected and then open the laptop and disconnect the main battery and press and hold the laptop’s Power button for 30 seconds and then release the button. Reconnect the main battery, reassemble the laptop, connect and switch on the charger and try to turn on the laptop.

Here’s the maintenance and service guide for the laptop, taken from this webpage. Go to p.29 to view the necessary pre-requisite steps and then the procedure to remove the battery.

If you have:

Then you have a motherboard problem

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Welp it was the backlight I'm going to link a video from YouTube that I uploaded showing what it does

https://youtu.be/Mjs0ukUhFe4

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@Stephanie Rew

A 3:2 error code is a memory problem

Search online for "HP Pavilion 15 CC (insert model number) service manual" to find the manual,

This will show how to correctly remove the modules from the motherboard.

Remove the modules and then reinsert them again and see if this restores the laptop.

Follow the instructions especially about disconnecting the battery before starting further inside the laptop

If there are 2 modules and it still doesn't work try installing only one and try. If still no good try the other. If still no good try the different slots in case one is faulty. Try each module in each slot etc.

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