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Flagship smartphone from Huawei released April 2018. Model CLT-L29.

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The screen is black, but the phone works (even the touchscreen).

My P20 Pro turns on, sounds, receives calls, and even the touchscreen works (I can get to the dial and it makes sound when I touch); but the screen is pitch black.

What I tried:

  • Restarting it to see if it’s a software issue. It restarts, but the screen is still black. I even tried to go to recovery or bootloader and the screen still is black.
  • Opened it up to see the screen connector. It wasn’t loose, nor dirty or corroded. I cleaned it up regardless, but still it doesn’t work.

So, I want to know if someone has experienced something like this… I don’t know if it could be a screen problem (since it’s in mint condition and the touch works), or it could be something related to the motherboard.

Any ideas? Thank you in advance!


Edit 07/10/2020:

I checked out the screen for a backlight issue, and I didn’t saw any images, but I noticed this blueish line underneath the phone, followed by a faint dark thick line. It covers the whole bottom of the screen. Could that be signs of damage of some sort?

Block Image

It also goes up a bit from the side.

Block Image

Edit 23/10/2020:

A CHANGE OF SCREEN FIXED THE ISSUE.

Before the change I fully opened it up, and it showed that water entered from the bottom right speaker. The mic board was fully corroded, and that blueish line that I saw inside the screen was indeed corrosion.

Thank you for guiding me in the right direction!

Beantwoord! Bekijk het antwoord Dit probleem heb ik ook

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Hi @tolin ,

Try shining a torch at an angle close to the screen and check if you can detect any images at all when the phone is turned on. They will be very faint if they are there at all so trying this in a darkened room may help.

If there are images it is a backlight problem. If there are no images to be seen, then either way as a DIY repair all you can do is to temporarily replace the LCD screen and check what happens and go from there.

If still no good it is on the systemboard. You would need to find the schematics for the systemboard to locate the backlight power supply circuit. I searched online without result. You may have better luck.

If it now works OK it was in the LCD display and the display cannot be repaired. It has to be replaced.

Here’s the ifixit Huawei P20 Pro Vervanging van het scherm guide which may help with this

Replacement screens are available online. Just search for Huawei P20 Pro LCD screen to get results for suppliers.

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Hi @tolin ,

It may be but the only way to find out is to replace the screen.

Screen problems don't have to be "visible"as there are fragile internal connections that can get broken and cause problems even if there is no obvious external damage.

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@jayeff Thank you very much for your suggestions! I tried to look for an image with the phone turned on, but I couldn't see anything...

But while looking I've noticed that it has a faint blueish line in the bottom part of the screen, that I've never seen in another phone before. I attached screenshots in the main post.

What do you think? Could that be signs of damage on the screen?

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@jayeff I see...

I will order a new screen and I'll update this post when I get it.

Thank you so much for your help!

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Cristóbal Peñaloza zal eeuwig dankbaar zijn.
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