iPhone 6S Plus displays nothing but it has response when connecting to computer

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Trouble Phenomenon

IPhone 6S Plus displays nothing but it asks you to input password when connecting to computer

Repair Process

Teardown iPhone and remove the motherboard . Charge it with DC power cable and turn it on. DC power shows power on current changes normally, but screen displays nothing. Most cases like this are caused by abnormal screen power supply.

First use multimeter to measure the diode data of display screen interface, finding no short circuit or open circuit. Next measure the display power supply, as shown in picture 2-20. Multimeter shows the capacitor C4002 on bootstrap circuit of power supply Drive control IC chip U4000 is 2v voltage which is lower than 6v voltage when disconnecting display screen. After checking, we find the working condition of U4000 is normal. So we think the damage is inside it. After replacing it, trouble is removed. The material object is shown in picture 2-21.

Picture 2-20

Picture 2-21


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