A customer sent us an iPhone 7 Plus need to
be repaired, the problem is that the iPhone 7 Plus compass not working, it is
abnormal.
After we received the iPhone 7 Plus, get
into IOS to test the iPhone compass function, it doesn't work.
Disassemble the iPhone 7 Plus by phone opening tools, take out the iPhone motherboard. The
appearance of iPhone motherboard looks good, but there are traces of moldy around
the gyroscope.
Carefully clean up the moldy areas, and
then connect it to DC power supply, it boots normally. Install the iPhone,
and test it, everything is fine, except the compass.
For this case, some people will think it's
the compass problem, and it can be fixed by replacing the new compass; some
people will think that the gyroscope is virtual welded, because the gyroscope
is moldy, it can be fixed by reballing the gyroscope.
We need to observe the iPhone motherboard.
Put it under the Stereo Zoom Microscope to observe
the compass and gyroscope, the parts around the compass are good, but one of
the 0 Ohm resistors around the gyroscope is slightly corroded, and two
inductors ware also slightly corroded near the display socket.
Touch it with tweezers, it fell off easily.
We need to short connect them. Use QUICK 861DW hot air rework station to solder the jump
wire, and then clear it up.
Install the iPhone and test it, the compass
functions works properly, the problem has been solved!
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