In this article, we will continue sharing the cell phone repair experience for iPhone 8-X.
For iPhone 8 and 8 Plus
1. The motherboard that marked with H3 K5, with a small current leakage is the common issue.
It’s caused by the PCB layer with problem, the only solution is swap the important chips like CPU, Baseband CPU, and EEPROM to a new board.
2. For iPhone 8 Plus, the board marked with PC-V0 also with similar small current leakage issue.
The issue might be caused by the PCB design defect, can only be resolved by swapping PCB.
3. iPhone 8 and iPhone 8 Plus no charging and cannot be connected with computer issue
Normally, it’s caused by the charging IC with problem. Compare with the USB IC, iPhone 8 series charging IC with high failure rate.
Can go to the charging IC directly for the charging or connection issue.
4. The no service issue is normally caused by the transceiver IC with problem
We can reflow or replace the transceiver IC (U_WTR_E) with a new one.
5. The Diversity Receiver
The poor soldering or pads missing of the two diversity receiver IC, can also cause no service or SIM card can not be recognized issue.
For iPhone X
1. The middle layers between the logic and the signal board
Especially for the drop-damaged phone, the pads on the middle layer is easy to get lost. We can use the heating platform to resolder and bond back the two layers of the motherboard.
2. The Face ID damage
For the Face ID repair logic and method, you can refer previous blog iPhone Face ID Not Working Repair Guidelines
3. iPhone X No Charging
The issue is normally caused by charging inductor L3340 and L3341 damage. If the inductors are damaged, better replace them with a new one.
4. iPhone X flikering screen and restart
Normally is caused by the inductor L2780 which on the power supply rail with problem.
5. Speaker function OK, but earpiece function failure
Like this kind of issue is normally caused by Audio CODEC IC with problem, we can just replace it with a new directly.
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