Huawei Mate 20 Pro has no signal (coaxial cable is loose)

Huawei Mate 20 Pro has no signal (coaxial cable is loose)

A Huawei Mate 20 Pro with poor card signal and sometimes disconnected network.mobile phone When disassembling the machine, it was found that the coaxial line between the main board and the tail plug-in small board was loose. After plugging the coaxial line again, the test signal returned to normal after starting the card.

[Fault model] Huawei Mate 20 Pro

【 Fault phenomenon 】 No signal

[Maintenance process] I received a machine sent by a customer for repair, the model of which is Huawei Mate 20 Pro. The fault is that the card insertion signal is poor and the network is disconnected from time to time.

Huawei Mate 20 Pro has no signal Figure 1

The card insertion test found that sometimes there was a signal, but the signal was poor, so it became no service when you made a phone call. When disassembling the machine, it was found that the coaxial line between the motherboard and the tail plug-in small board was loose.

Huawei Mate 20 Pro has no signal Figure 2

Plug in the coaxial cable again, and then turn on the card and the test signal will return to normal.

Huawei Mate 20 Pro has no signal Figure 3

[Maintenance result] After the motherboard is put into the shell, the mobile phone can be turned on normally. The functions of WiFi, Bluetooth, voice, charging, fingerprint, taking photos and making phone calls are all normal, and the maintenance is over.