According to the point bitmap, measure the battery connecting seat position and find that the battery seat position is short-circuited; It was found that a capacitor next to the CPU on the B side of the upper layer was short-circuited. After replacing the capacitor, the fault was repaired.
Follow the foot of CC1, we will measure the foot corresponding to the small board seat, and then find out if there is a ground diode connected to it on the small board.
I received a Huawei Glory 9X Pro. The fault description shows that the camera of the mobile phone can't be raised or lowered. After I removed the two resistors next to U2803, it can be raised or lowered, but then the mobile phone can't be charged.
When the mobile phone is turned on, the flower screen is found. Due to the universal tin-planting steel mesh, the CPU is removed again, and several spots are found to be soldered. After reinstalling the CPU, the mobile phone is turned on normally, and all functions are tested normally. The maintenance is over here!
HUAWEi Mate 20 Pro restarts automatically from time to time, and the CPU has a common fault of virtual welding. The fault is repaired after the CPU is redone.
iPhone 12 Pro can't hear the voice of the other party when calling. Replace a receiver and fix the fault.
HUAWEI Mate 30 can't connect WiFi. Clean the corroded place first, then replace the WiFi chip and fix the fault.
Xiaomi K40 can't be turned on, and the CPU has a common fault of virtual welding. The fault is repaired after the CPU is redone.
HONOR Play3 screen does not display, and the fault is fixed after replacing backlight diode.
HUAWEI P20 can't be turned on. Remove the short-circuit capacitor and repair the fault.
