iPhone 8 Touchscreen Unresponsive Repair

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Malfunction Phenomenon

The phone turns on normally, but the touchscreen unresponsive.

Try to replace a new display assembly and test again, the problem still remains.

iPhone 8 Touchscreen Unresponsive Repair

Trouble Shooting

For the iPhone 8 Touchscreen Unresponsive Repair, we need to take out the motherboard and check the display touch connector J5700 and touch connector J5800, the measured value is normal.

So we connected with display assembly installed and connect the battery connector with DC power supplies, then shorted the pin 8 to the ground with tweezers, the system detects the power button pressed.

After that, we should check the voltage of the touch connector J5800.

Measure the voltage values of C5602, C5603, C5604 respectively, the measured value is normal.

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But the value of C5601 is 0, which is abnormal.

The C5601 cant get enough voltage caused by U5600 is damaged, the fault of touch relevant circuit or home button relevant circuit. So we can try to replace  U5890 with a new one.

Then we assemble it and test again, the touch function can work normally. Problem resolved.  

iPhone X Motherboard Repair Course

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REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

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