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HUAWEI nova 9 Pro has no service
Machine model: HUAWEI nova 9 Pro
Malfunction: After the mobile phone card is inserted, it shows no service, so you can’t make a call.
Maintenance process: After receiving the mobile phone, when you turn it on, you will see no service displayed in the upper left corner of the screen.
HUAWEI nova 9 Pro has no service Figure 1.
Tried to make a phone call, and the phone said “turning on the antenna”.
HUAWEI nova 9 Pro has no service Figure 2.
HUAWEI nova 9 Pro is equipped with Qualcomm chipset. As long as one of the power amplifier chips is not working properly, there will be a fault phenomenon of “opening the antenna”. So disassemble the machine, take out the motherboard, and check whether all the power amplifier chips have virtual soldering and dropping points. After observing for a while, I found that there was a problem with a power amplifier chip. After removing the power amplifier, I found that the motherboard pad dropped.
HUAWEI nova 9 Pro has no service Figure 3.
So the artificial pad is made again.
HUAWEI nova 9 Pro has no service Figure 4.
Handle the pad, solder the power amplifier chip, and put the motherboard back into the mobile phone. Perfect fault repair.
HUAWEI nova 9 Pro has no service Figure 5.
HUAWEI nova 9 Pro has no service Figure 6.
