The iPhone 6S screen doesn't display after booting, here is the solution. The iPhone has been hurt by water, it can't be turned on, just shows black screen. The solution as follows.
Use phone opening tools to disassemble the iPhone, and then connect the iPhone
to the DC power supply to test the iPhone boot current, the
current data tested is normal, which means the iPhone can be turned on
smoothly.
Take out the iPhone motherboard, observe it
under the Stereo Zoom Microscope, there are small trace of water on the
iPhone motherboard. Carefully clean it up.
Observing the iPhone display socket and
those inductance resistances around it, we found the FL4220 is virtual welding.
Check iPhone schematic diagram in the WUXINJI Dongle, so we can know the position of the FL4229.
Now, use Titanium Alloy Tweezers to remove the FL4220, and the use QUICK 861DW hot air rework station to short connect
it.
After connection, measure the iPhone, all data test are normal. So, assemble the iPhone to test, the iPhone screen has display now. Test other functions on iPhone, all works well!
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