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Huawei Mate 30 Pro No signal repair
Machine model: 5G Huawei Mate30 Pro
Malfunction phenomenon:
I received a Huawei Mate30 Pro from the customer, saying that there is no signal on the mobile phone. When I turn on the settings, it is Baseband version and IMEI are empty.
Huawei Mate 30 Pro No signal repair Figure 1.
Fault analysis:
no Baseband Version of Huawei Kirin model is mainly caused by problems of main power supply, CPU and IF VCC.
Maintenance process:
As the mobile phone is beautiful, first consider the main power supply Inveracious Soldering, and the main power supply failure of separate Repeat welding remains the same. Next, check several Related circuit of IF VCC and find several Related circuit of IF Related circuit.
Huawei Mate 30 Pro No signal repair Figure 2.
There are five VCC lines,welding goes back to the upper board, and the boot measurement shows that XLDO_HI6365_ANA_1V0 line does not have VCC.
Huawei Mate 30 Pro No signal repair Figure 3.
According to the drawings, he was sent by U1602.
Huawei Mate 30 Pro No signal repair Figure 4.
Huawei Mate 30 Pro No signal repair Figure 5.
Direct short-circuit input and output.
Huawei Mate 30 Pro No signal repair Figure 6.
Huawei Mate 30 Pro No signal repair Figure 7.
Maintenance result:
Boot test, perfect repair.
Huawei Mate 30 Pro No signal repair Figure 8.
