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Monday 11 November, 2019 |

Fixed: iPhone X LCD shows vertical white line and auto restart

After the iPhone X is turned on, we can see there is a vertical white line on the iPhone display screen, and then turns blurry, finally it restarts automatically, it's stuck in this loop. How to fix this product? Keep reading.

Use screwdrivers to remove the iPhone screws at the bottom of the screen, and then put iPhone X on the CPB screen separator for heating. After a while, use LCD pry tool to open the iPhone X screen, remove the iPhone display assembly.

Install a new iPhone X display assembly, and then turn on the iPhone X to test, but the problem is still the same, now we confirmed it's not the problem of the iPhone X screen.

Disassemble the iPhone X again, remove the iPhone X display assembly, disconnect the iPhone battery, and then remove the iPhone X motherboard.

First measure the diode data for iPhone display connector by digital multimeter, the diode data measured is normal.

Connect the iPhone motherboard to iPower Max pro cable, and then trigger the iPhone, the boot current measured is normal.

Use digital multimeter to measure the working voltage of the iPhone screen, the value measured all are normal, now we can confirmed it's not the problem of the iPhone display circuit.

Based on our repair experience, this problem may be caused by PP_GPU_SRAM circuit or iPhone CPU.

Signed in to ZXW online account to check iPhone X schematic diagram and bitmap, and then we need to measure those related components one by one.

Put iPhone X motherboard on the SST12A heating station to separate the iPhone X motherboard, and then use digital multimeter to measure the iPhone logic board, the data measured is normal.

According to the iPhone X schematic diagram, now we are going to check L2780. Attach the iPhone X motherboard to the PCB holder fixture, and then use hot air gun and tweezers to remove L2780. Clean the solder pad, and then install the new L2780 to the motherboard.

Now use iSocket test fixture to measure the iPhone X, the iPhone X screen displays normally and it can be turned on properly.

Install the iPhone X motherboard double layers, and then assemble the iPhone X, press the power button, the iPhone X is turned on successfully, and the iPhone display screen works perfectly.

This video was shared by REWA.

by Bellin

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