iPhone 11 Black Screen

It is rare for an iPhone 11 to develop issues producing an image because of a software issue. But an iPhone in Direct Firmware Upgrade mode, or DFU mode, manifests with no image on the screen, only the backlight may be on. This could point to an issue with firmware.

• Connect the iPhone to a computer to see if it can be recognized. If it is in DFU mode, iTunes or Finder will indicate that there is an "Issue with the device," but it will only offer a restore option. The "Update" button will be grayed out.
• Click “Restore” to reinstall the firmware and Operating System. This will erase all the data on your device. Be sure you have a backup before processing a restore.
• If restore fails with an error message, document it. Now might be a good time to visit the Answers forum, where you can get more personalized help. Be sure to mention the error message in your question!

Along with the front-facing camera, a host of other sensors populate the top edge of the display. The Ambient Light Sensor, or ALS, is responsible for setting the screen’s auto brightness. The screen may not be black, just dim.

• Working in a dark environment can help if your screen brightness is low. Shine a flashlight at the display to check for signs of image, even if the screen isn’t lit. Check at a few angles to confirm glare isn’t preventing you from seeing anything. If you still cannot see anything on screen, skip ahead to the Screen Disconnect section.
• You can verify your sensor is faulty by turning auto brightness on and covering the top portion of the phone with your hand. If the brightness changes, the ALS is working properly.
  • This option can be found in Settings > Accessibility > Display and Text Size. It will be green if it is enabled.
• The cable assembly containing the ALS is mounted to the back side of the display around the cutouts for Face ID and also contains the receiver speaker.
• If you find any signs of liquid entry along the top edge, the ALS is commonly the first thing hit. Check for patina on any of the metal components along the top edge. Replace this sensor cable if you're at all suspicious

Especially after a hefty drop, the connection between the board and the screen can separate. It is uncommon, but still worth investigating. It follows the old troubleshooting tactic of unplugging, then reconnecting anything giving you issue. Even one pin inside the display connector being off could prevent image from showing on screen.

• The solution here is only logical–break out the tool set, open up your iPhone, and reseat any display-related connectors. Then retest.
• Don’t bother closing your iPhone back up before testing. Make sure everything is connected and rest the display in the housing.
  • Not only does closing your device preemptively summon bad tech vibes (never assume success), it will save you work if you need to complete more troubleshooting, or replace a part.

Although most display failures seem obvious, even without visible damage, the display may not work properly due to something amiss internally. Cracks in glass can also be difficult to detect until the light catches them.

• Look closely at your display for signs of a break. Changing your viewing angle may help catch small hairline cracks.
• Use a paper clip to eject the SIM tray. Shine a light into the slot to check the liquid contact indicator—it will be pink or red if it has touched liquid. This sticker is on the underside of the display, so it can be tricky to spot. Liquid damage to the display can cause this failure.
  • If you see this has been triggered, be extra mindful to check for any signs of liquid exposure inside the phone.
• Check internal cables for signs of tears or other damage. If you aren’t certain which ones are linked to the display, refer to the Display Replacement Guide.
• If you find damage, or software fixes have not made a difference, replace the display.

On iPhones with LCD-type displays,the screen's ability to illuminate is separate from its ability to produce an image. The iPhone 11 is the last iPhone to make use of this before swapping all models to the newer OLED tech.

• Check to see if there is an image on your display when shining a flashlight at it. This is best done during boot, when the Apple logo is on screen, due to the high contrast.
• If your backlight is out without any previous repair work, or signs of liquid damage, a new display is the likeliest cure.
• Already changed the display, or the issue occurred after a repair? Forgetting to unplug the battery before replacing parts can cause this issue. Check for signs of heat on the board, especially around the display connectors. It may have melted the foam sticker, charred the board itself, or smell burnt.
  • Backlight related board components are well hidden under the shields on the iPhone 11, but giving the board a once over can help find issues regardless.
  • If this looks like your issue, this is a prime candidate for finding someone who can microsolder, since it will require replacing parts on the logic board itself. Any good board repair shop will have experience in backlight issues. Even if your local shop doesn’t do board level work, they may know someone who does!
• If you cannot find a shop to do this work, or you cannot do it yourself, replacing the logic board is your only option.

The logic board is the hub for the vast majority of an iPhone's functionality. Any number of the small components on the board may have failed or become damaged and is a safe assumption of cause if nothing else on this page has worked.

• Check for obvious signs of a board issue—burned or cracked components, liquid residue, corrosion, or bend. If there are signs of liquid, the iPhone Liquid Damage Guide might help.
• Replacing the logic board is often the most practical solution for a DIYer whose board has failed.
  • Be aware if chose to undertake this, a paired True Depth Camera and front sensor assembly will be necessary to maintain Face ID function.
• Contrary to popular belief, the board itself can be repaired. However, it requires specialized tools and microsoldering know-how. If you’re feeling curious, and want to know more about getting into micro soldering, here’s some good reading and some good watching to get you started.