Huawei Enjoy 10 shows that there is no service and no network maintenance can be found

Huawei Enjoy 10 shows that there is no service and no network maintenance can be found.

Machine model: Huawei Enjoy 10

Fault symptom: the mobile phone shows no service.

Maintenance process:

Turn on the phone, Huawei enjoys 10 shows no service, and can’t find the network.

Huawei Enjoy 10 shows that there is no service, and no network maintenance can be found. Figure 1.

Huawei Enjoy 10 shows that there is no service, and no network maintenance can be found. Figure 2

Enter “*#06#” in the dialing interface, and the mobile phone can display IMEI code, indicating that the baseband of the machine is normal.

Huawei Enjoy 10 shows that there is no service, and no network maintenance can be found. Figure 3.

Disassemble the main board, measure both the RF power amplifier and the power supply of the power amplifier with a multimeter, and then measure the RF bus. It is found that there is a group of RF buses with a resistance value of 0, which should be resistive under normal circumstances, and the resistance values of data lines and clock lines are also 0. Therefore, the fault of capacitor short circuit can be basically eliminated, which is probably caused by chip damage.

Open Xinzhizhao software, check the dot bitmap, and find that this group of RF buses leads to four chips.

Huawei Enjoy 10 shows that there is no service, and no network maintenance can be found. Figure 4.

So these four chips were removed in turn, and when the diversity low noise amplifier was removed, it was found that the bottom corner of this chip had black marks.

Huawei Enjoy 10 shows no service, and no network maintenance can be found. Figure 5

After cleaning the tin, the measured resistance returned to normal, so a new chip was replaced, the phone was turned on and plugged in, the signal returned to normal, and the network could be searched. At this point, Huawei enjoyed 10 displays and no service, and the network fault could not be perfectly repaired.