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iPhone 7 Plus repair of Won’t Turn On after falling
Machine model: iPhone 7 Plus
Malfunction: mobile phone Won’t Turn On
iPhone 7 Plus repair of Won’t Turn On after falling Figure 1.
Fault analysis: the mobile phone no booting can be disconnected and connected to DC power supply, and then the power-on current can be checked and judged.
Maintenance process: disassemble the machine, take down the motherboard, connect DC power supply, turn on the current to 60MA, and then return to zero. Repeat current of change, and see that such current change is no better than RAM.
iPhone 7 Plus repair of Won’t Turn On after falling Figure 2.
The measurement of RAM related VCC and other conditions are normal, and the possibility of falling Inveracious Soldering should be considered for the fallen machine. Scrape off all the vinyl around the CPU, and see if there is any CPU Inductor that falls Inveracious Soldering.
There is no abnormality in scraping.RAM dropped by iPhone7 Plus is easy to drop Short circuit. It is rare to drop Inveracious Soldering on the upper layer, so dismantle the main CPU.
iPhone 7 Plus repair of Won’t Turn On after falling Figure 3.
PAD is empty. Handle PAD and solder it back to the motherboard. Start-up test, start-up is normal, function is normal, and maintenance is over here.
iPhone 7 Plus repair of Won’t Turn On after falling Figure 4.
This fault is caused by CPU Inveracious Soldering, but the RAM current is not enough.
