A dropped iPhone，the iPhone
display screen has been replaced, after using for a while, the customer
feedback that the fingerprint unlock function can't be used. Check fingerprint
on the Settings, it prompts that "Failed, Unable to complete touch ID
setup, please go back and try again".
Use Fluke 15B+ Digital Multimeter to measure the resistance value for
fingerprint socket, all is normal. Replace the fingerprint connector flex
cable, we found a tear mark on the iPhone fingerprint button.
Perhaps the iPhone fingerprint can't be
used is caused by disconnection, we need to re-connect the new flex cable. The
line inside the flex cable is very thin, total is 19 lines. This can't connect
a single cable, we can only remove the flex cable to docking.
Take a new iPhone home button, put it under
the Stereo Zoom Microscope, cut off from the position close to the
original iPhone home button disconnection, take the end of the socket (try to
cut a bit longer), we can separate the lines and lid on the original home
button, there is a solder point, directly heated with the QUCIK 861DW hot air rework station, and then pry it
with the blade.
After separating the iPhone home button, we
can cut off the fingerprint from the disconnection place, scraping fingerprint
cable must be very careful, pay attention to the direction cannot be blown back
We've better find some bad home button and
then scrap the flex cable to practice, the boot flex cable can also be
practiced.
After scraping，apply some
tin on it, and then connect the new and old iPhone fingerprint flex cable.
After finish the connection, first we need
to test it, if the test is successful, we can reinforce it. Cut off a small
piece of discarded fingerprint flex cable, use glue to cover the docking area
for protection. After the glue has solidified, install the iPhone and test it
again. The iPhone 6 no fingerprint failure repairing done!
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