Quickly solve! Apple iPhone11 doesn’t turn on

Quickly solve! Apple iPhone11 doesn’t turn on

The measured voltage is not generated. The first step of starting is to convert the battery voltage into the main power supply. The measured resistance of the main power supply is normal and there is no short circuit. Then we directly disassemble a charging IC of the same model and install it. The specific maintenance process is as follows:

“Machine model” Apple iPhone 11

[Fault phenomenon] No boot.

[Maintenance process] The customer sent a machine that didn’t turn on.mobile phone The model is Apple iPhone 11. According to the customer’s description, the mobile phone will not be turned on when it is used, and there is no response when charging and pressing the power button.

Apple iPhone 11 does not boot Figure 1

After receiving the machine, plug in the charger to see the current, and find that there is no current. Disassemble the machine to see the motherboard. When the machine is powered on, press the power-on key, only a few milliamps of current jump, and find the main power supply test point on the motherboard, and the measured voltage is not generated. The first step of starting the machine is to convert the battery voltage into the main power supply before turning on the power supply at the back.

Since there is no main power supply, the power supply at the back can’t come out naturally, and the power supply can’t work, so there is no response when the power button is pressed. Since 11 is a double-layer motherboard, the charging IC is on the back of the upper layer, so we need layered maintenance.

Apple iPhone 11 does not boot Figure 2

After layering, the measured battery voltage has been sent to the charging IC, but the charging IC does not work normally, and there is no main power supply. The resistance of the main power supply is normal and there is no short circuit. Then we directly disassemble a charging IC of the same model and install it.

The main power supply voltage of 3.6v has been generated. Press the power-on key, the current will jump normally, and the single upper layer can also be turned on. We will directly switch on the single upper layer, and then attach the upper and lower layers after seeing that the motherboard can enter the system, and then turn on the power when it is confirmed that there is no short circuit.

Apple iPhone 11 does not boot Figure 3

[Maintenance result] Install the motherboard into the mobile phone, and start the test. The mobile phone is normally booted into the system, and the functions such as charging, WiFi, voice, compass, vibration and telephone are normal. The maintenance is over here.

This case was originally provided by Xunwei Quick Repair Flagship Store, and it is forbidden to reprint without authorization!