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.
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.
The water damage Won't Turn On is serious, and the detection VCC corrode is very serious. Redo the chip on the bottom of pin corrode and repair the fault.
Huawei Mate 30 Won't Turn On, after measurement, it was found that Inveracious Soldering appeared in Inductor next to the power supply, and the fault was repaired after replacing it.
iPhone 12 Pro Max Won't Turn On, after disassembling and testing, find Short circuit Capacitor with The rosin smoke method method, and replace it with perfect repair.
iPhone 6S Update System failed with an error of 4013, and the detection found that Inductor pin dropped an pin on the reverse side, which was normal after replacement.
