iPhone X falls backless service repair

Machine model: iPhone X
Malfunction: no serviecs after falling
Customer description mobile After the crash, the card can’t be read, which indicates that the update of the cellular network has failed, and a line falls out of the screen.

iPhone X falls backless service repair Figure 1.

Maintenance process: after receiving the mobile phone, the mobile phone prompts that the cellular network update failed, and the firmware of the modem in this machine can’t be identified. It seems that there is no Baseband.

iPhone X falls backless service repair Figure 2.

It’s a phenomenon that didn’t appear until after falling. The motherboard of this machine is double-layer welding. After falling, PAD in the middle layer is easy to deform pad break off. When the machine and motherboard separate are disassembled, it is found that there are indeed solder joints falling off pad break off. Open Xinzhizao Soft to check, this signal is Baseband signal from 90_PCIE_AP_TO_BB_REFCLK_N CPU to pad break off CPU.

iPhone X falls backless service repair Figure 3.

iPhone X falls backless service repair Figure 4.

iPhone X falls backless service repair Figure 5.

Next, we’ll just dig up the patches of Jump wire and handle PAD.

iPhone X falls backless service repair Figure 6.

Clean up, and the motherboard is welding.

iPhone X falls backless service repair Figure 7.

Maintenance result: During the installation test,Baseband returned to normal, the signal was normal, and the call was normal. The maintenance ended here. This fault was caused by the middle pad break off caused by the plane falling, and the mobile phone kept no serviecs.