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Troubleshoot: iPhone 6 compass doesn't rotate (unavailable)


The iPhone 6 compass doesn't rotate during the normal use, after checking,we found the iPhone 6 compass function is unavailable. After tired some software solutions, the iPhone compass still not working, now we need to check iPhone hardware problem.


Disassemble the iPhone 6 by phone opening tools, remove the iPhone motherboard, the iPhone motherboard looks good, no water damaged and no pressure damaged. 

Measure the iPhone motherboard by DC power supply, the current is normal. Test  the gyroscope and gravity, both of them are normal, but the compass does not rotate.

Then we directly removed the compass u1901ic and measured the pin resistance value, the digital multimeter shows that A4 pin has no resistance.

Compass A4 pin is through u2201 coprocessor B6 pin, so we remove the u2201 and test with the multi-meter, it is found that the two pins are not connected, indicating there is a broken wire.



After careful observation under Trinocular StereoMicroscope, it is found that there are tiny cracks in the screw holes under the GPS.

In case of uncertainty, we find another motherboard and dig it out. Also use the multimeter to check the compass A4 pin and find the wire passes through here.

Then dig it up and the cracks will not be removed. Use the jumper wire to short connect them.

After connection, use digital multimeter to test the compass A4 pin resistance, the value returnes to normal now. 

Soldering the IC to the iPhone motherboard, and then assemble the iPhone 6, get into IOS to test the iPhone compass function, it works normally, the trouble has been solved!


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