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IPhone 7 Won’t Turn On repair
Machine model: iPhone 7
Fault symptom: mobile phone Won’t Turn On
Maintenance process:
Received a iPhone 7, fault description mobile phone Won’t Turn On.
The disassembly found that it had been repaired. The traces of Colophony (Solder)were all over the main power supply, and Colophony (Solder)on the main power supply had been melted.Colophony (Solder)switch current 1.3A, the first consideration is Connect the power supply 3V 1.8V Nand.
IPhone7 Won’t Turn On repair figure 1
The measurement found that Short circuit was caused by Nand 3V VCC problem.
IPhone7 Won’t Turn On repair figure 2
This Capacitor is broken. Just deduct it.
IPhone7 Won’t Turn On repair figure 3
Measuring diode value is normal.
IPhone7 Won’t Turn On repair figure 4
Boot into the system normally, and troubleshoot.
