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HUAWEI nova 7 does not turn on for repair
Machine model:HUAWEI nova 7
Fault phenomenon: mobile phone no booting.
Repair process: press the power on key, mobile phone Won’t Turn On.When the single board is powered on, the measured current is 5mA. The VCC of the battery is at 4.5V or so, and current of change is not stopped.It is speculated that VCC battery or main VCC has micro Short circuit.
HUAWEI nova 7 does not turn on for repair Figure 1.
Next, test the battery VCC and the main VCC diode value, and the values are normal.Therefore,DC power supply is used to power up the battery VCC and the main VCC respectively. It is found that the main VCC Short circuit is in the later stage.
HUAWEI nova 7 does not turn on for repair Figure 2.
After smoking Colophony (Solder), it was found that the Colophony (Solder)frost on the coder chip had melted.Take this coder chip down, power on test again, the phone can be turned on.
HUAWEI nova 7 does not turn on for repair Figure 3.
So directly replace the coder chip, troubleshooting, maintenance to this end.
HUAWEI nova 7 does not turn on for repair Figure 4.
