iPhone screen doesn't display - how to fix?

After pressing the iPhone power button, the Apple logo doesn't appear as usual, and the iPhone screen keeps black. What's wrong? Why iPhone screen doesn't display? How to fix?

As we know, the iPhone software problem can cause iPhone black screen problem, meanwhile, the iPhone screen itself problem and iPhone motherboard problem also can cause iPhone black screen failure. Here are some suggestions to fix it.


1. Force restart iPhone

Different iPhone models have difference methods to force restart.

- Force restart iPhone 6S and earlier

Press and hold the iPhone power button and iPhone home button at least 10 seconds, release both buttons when you see Apple logo appears on the screen.

- Force restart iPhone 7 or 7P

Press and hold the iPhone power button and iPhone volume down button at least 10 seconds, release both buttons when you see Apple logo appears on the screen.

- Force restart iPhone 8 / 8P / X

Press then release the iPhone volume up button, immediately press then release the iPhone volume down button, and then press and hold the iPhone side button till you see an Apple logo appears on the screen.

2. Update IOS

Generally, there are 2 ways you can update IOS, one is update it on the iPhone, but in this case, we don't choose it, because the iPhone screen doesn't display, so we have to choose the second way, use iTunes or other third-party software to update iPhone IOS.

- Connect iPhone to the computer by iPhone lightning cable
- Update iTunes to the latest version
- Open iTunes and select your iPhone
- Click Summary, and then click Check for Update.
- Click Download and Update

3. DFU restore iPhone
DFU restore iPhone will erase all settings and data on iPhone, so it can most deeply to fix iPhone software problem.

Before you are going to restore iPhone, you should backup your iPhone.

- Connect iPhone to the computer by iPhone lightning cable
- Update iTunes to the latest version
- Back up iPhone by iTunes
- Put iPhone in DFU mode
- Use iTunes to restore iPhone

After tried above the software solutions, if the iPhone LCD still shows black, then you should check iPhone hardware parts, such as the damaged iPhone display screen or damaged iPhone motherboard.

4. Replace new iPhone display screen

If the iPhone display screen is damaged, you can't fix the black screen problem by software solutions, we can try to fix it by replacing the new iPhone display screen.

- Use phone opening tools to disassemble the iPhone
- Remove the iPhone display screen
- Install the new iPhone display screen
- Power on iPhone and test it

After replacement, if the iPhone screen stills no display, then possible it's the problem of the iPhone motherboard.

5. Repair iPhone motherboard

As we know, the iPhone motherboard is the core part of the iPhone, there are many components, some components can cause iPhone no display problem, such as iPhone flash IC, iPhone backlight IC and so on.

In order to repair find out the faulty part on the iPhone motherboard, we need to disassemble the iPhone, remove the iPhone motherboard, and then use DC power supply or digital multimeter measure the iPhone motherboard to find the faulty part,so that we can fix it.

For replacing iPhone screen and repairing iPhone motherboard, the phone repair skills and phone fix tools are required; if you are not the professional repair man, please don't do the last 2 suggestions by yourself, just contact Apple Care or iPhone repair shop.

iPhone 6S rear camera failure with PCB repairing solution

Here is an iPhone 6S with rear camera failure problem, this iPhone rear camera is damaged by water, so we need to check iPhone hardware aspect to fix it. Here we can get an PCB repairing solution. 

 

1. Disassemble the iPhone 6S.

Use screwdrivers to remove the screws at the bottom of the screen, and then put iPhone screen on the CPB screen separator for heating. After heating a while, we can use LCD sucker to open the iPhone screen.

2. Replace the iPhone rear camera. 

Remove the iPhone display screen, becuase it's the iPhone camera problem, so we try to fix it by replacing the new iPhone camera.

Remove the iPhone rear camera, and then install a new camera.  Assemble the iPhone 6S, and test the camera function, unfortunately, the iPhone 6S rear camera still doesn't work.

3. Remove the iPhone motherboard

So is it the iPhone motherboard problem? we need to remove the iPhone motherboard to check it.

Use phone opening tools to disassemble the iPhone 6S, remove the iPhone display assembly, disconnect the iPhone battery, and then remove the iPhone motherboard.

4. Repair the iPhone motherboard.

Put iPhone motherboard under the microscope to observe, we found the power supply 2.85V tube of iPhone rear camera has been burned, use tweezers to remove the 2.85V tube directly

Login to the ZXW online account to check iPhone schematic diagram,  we know that this IC is converted from the main power supply VCC_MAIN to 2.85V for iPhone rear camera

After removing this chip, we found the main power supply pin has been burned Because this IC is too small, it's difficult to replace, and soldering a jumper wire by QUICK 861DW hot air rework station also is not good, so we are going to borrow 3V voltage.

As we know, there is a 3V test point on the iPhone motherboard, use digital multimeter to measure it, so we can find out this 3V test point.

Soldering a jumper wire from the 3V test point by QUICK TS1200A, apply some green UV oil on it.

5. Assemble the iPhone and test it.

Assemble the iPhone 6S, press the power button, it's turned on smoothly. After entering the IOS system, test the camera function, now the iPhone rear camera is working properly. The repairs ended!