An iPhone 6S dropped and then it doesn't
boot. Disassemble the iPhone with phone opening tools, and then put it connects to DC power supply, it shows big short circuit. After measure
it, we found the PP_VCC_MAIN is short circuit. Many of dropped iPhones
PP_VCC_MAIN filter capacitor will be short circuit.
Remove the iPhone
motherboard, and observe it under the microscope, we found the capacitance C5283_RF next to
iPhone WI-FI chip turned gray, it differs greatly from the
color of the capacitor next to it. This capacitance is the filter capacitor of
PP_VCC_MAIN.
Now we directly remove this capacitor, and
measure it again with multimeter, the resistance value is back to normal.
As shown in picture 2.
Connect it to DCpower supply again, and boot it, now it shows normal, the iPhone 6s can
be turned on. The repairs end!
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