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How to repair HUAWEI nova 2s without sound
Machine model: HUAWEI nova 2s
Fault phenomenon: HUAWEI nova 2s has no sound. The mainboard was repaired and replaced with charging connector BTB connector.
HUAWEI nova 2s without sound Figure 1.
Maintenance process: power on test, the horn is good, the fault is still the same after changing a small coder.
HUAWEI nova 2s without sound Figure 2.
Measuring the working conditions of small coder, it is found that the bootstrap boost Capacitor pin VCC is 0V, and then measure Capacitor to the ground diode value is OverLoad,Boardview shows that Capacitor pin is connected to the chip, there should be more than 500 normal diode value, it is speculated that there is a broken wire in the middle.
HUAWEI nova 2s without sound Figure 3.
Directly pull a wire to fly to the next Capacitor, test diode value returned to normal, but the boot test is still no sound.When checking charging connector BTB connector again, use tweezers to gently push BTB connector. It is found that BTB connector has obvious deformation. It should be Inveracious Soldering. Directly remove charging connector BTB connector and then reassemble.
HUAWEI nova 2s without sound Figure 4.
After the phone is turned on, the music will play normally.
HUAWEI nova 2s without sound Figure 5.
