How to fix iPhone 8 Plus No Display| Motherboard Repair

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You may face motherboard line damage or missing soldering pads when repair your iPhone, in this article, we share how to fix iPhone 8 Plus no display by making jumper wires, hope you enjoy our sharing.

Step 1 Function Test

Buckle the iPhone 8 Plus motherboard with a screen assembly, connect to the DC Power Supply and boot up. The booting current showed unstable while going down and rebooting again, plus the screen has no display function.

The booting current measured stable, and when unbuckle the screen, the motherboard keeps rebooting.

Step 2 Diagnosis

Place the motherboard under the microscope and measure the diode resistance of the display connector. The diode resistance of the display connector pin 18 is measured open while the diode resistance of the pin 23 is measured too small.

Step 3 Troubleshoot

According to the schematic we can tell the open diode resistance is caused by fallen inductors. The diode resistance of the inductor solder balls is measured normal, next make jumper wires to repair.

Step 4 Repair

Add solder flux, add tin on the solder balls with soldering iron, connect the jumper wires to the solder balls, the diode resistance is remeasured normal, add UV solder mask and cure with the UV curing light.

The diode resistance of the display connector pin 23 still showed too small, when remove the capacitor C5604, the diode resistance measured normal, therefore, it’s the defect capacitor C5604 caused the too small diode resistance, repair by replacing a new good capacitor

Step 5 Reassemble and Test

Buckle the motherboard with a screen assembly, connect to the DC Power Supply and boot up, the iPhone boots up normally, the screen display works properly as well, repair completed.

Please refer to below detailed video:

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Tools and Materials Used in This Video:

Spudger

DC Power Supply

Microscope

Motherboard fixture holder

Multimeter

Solder flux paste

Solder wire

Soldering iron

Knife blade

Tweezers

UV curable solder mask

UV curing light

Hot air gun

Desoldering braid/solder wick

Soft brush

Cleanroom wipes

PCB cleaner

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