Huawei Mate 30 Pro has no signal. According to the drawing, it is found that it is sent by U1602, and directly input and output by short-circuit. Boot test, perfect repair.
Huawei's Nova5i water damage has no backlight display, and BTB connector shows that the backlight anode has no diode value. Go directly to BTB connector Jump wire to BTB connector Fuse, and solve the problem.
iPhone 6s can't read the sim card. The detection found that it was caused by RF hip. After replacing Xt14001 IC U _ WTR _ RF chip, the signal display was normal.
The iPhone 8 Plus fell, the mobile WiFi could not open, the GPS signal was detected, and the test found that this fault is caused by the breakage of the motherboard, and the problem is repaired after the flying line.
Huawei Nova7 can't access the LOGO of the system card when it is turned on, and it has been restarted all the time. The measurement found that after touching Capacitor Short circuit next to BTB connector, the fault recovered after picking auto power off.
The rear mobile phone Camera can't be opened. According to the drawing, we know that this signal has passed through a resistor to the CPU. Measure Normal value at both ends of the resistor and decisively remove the CPU cover Jump wire.
The display of Huawei Nova7 screen is abnormal. After checking, the circuit from BTB connector display screen to resistor has been disconnected by corrode, so it is ok to repair the circuit.
iPhone promox can't be charged. After disassembling the machine, charge the chip Short circuit, and replace it with a new diode value. After installation test, the charging is normal.
Huawei Nova5 mobile phone can't be charged, and USB switch Switch is burnt out, resulting in USB corrode Short circuit, which is charged normally after replacement.
