iPhone 7 Plus 3D Touch Not Working

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Malfunction Phenomenon

The phone can be turned on and the touchscreen can work, but the 3D touch does not work at all.

iPhone 7 Plus 3D Touch Not Working

Trouble Shooting

For the iPhone 7 Plus 3D Touch Not Working issue. Disassemble the phone and check the motherboard, especially the area around the 3D touch connector J3801.

We found the capacitor C3828 and the relevant pads on the PCB were lost. This capacitor is a filtering capacitor on the PP_VDD_BOOST line to the LDO chip U3801.

iPhone 7 Plus 3D Touch Not Working

iphone 7 plus 3d touch not working 3mqi7

Continue to check the diode value on the capacitor C3724, the value was 379.

Then we continue to the connection pad of U3701, the value was 521, the two pads were connected, the diode value should be the same.

So we can conclude that the rail between C3724 and Pad 4 of U3801 was open.

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Jump a wire from C3724 to the pad of U3801 and tested again, the diode value was back to the same as the value on C3724, and the 3D function was also back to normal, problem resolved.

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iphone 7 plus 3d touch not working

iPhone 7 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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