Check iPhone schematic diagram on WUXINJI Dongle,
we know that there are two sets of backlights, one set is on the left of the
iPhone display screen, and one set is one the right of the iPhone screen, they
are controlled by light boost IC-- A and light boost IC-- B.
The light boost IC--A controls the
backlight on the right side of the screen, it controlled by three sets of
signals: PP_LCM_BL_ANODE (10.5V cathode power supply),PP_LCM_BL_CAT1 and
PP_LCM_BL_CAT2. If these three sets of signals don't work or the light boost
IC-- A damage will cause iPhone right screen won't light.
The light boost IC--A external two sets of
diodes and boost inductors, the iPhone 6 only have one set, and because the
iPhone 6S has one more function, the iPhone front
camera comes with flashlight, so this front flash
light is provided by the newly added set of rectifier diodes and boost
inductors. If one of these is damaged, then it will cause boost light IC--B was
burned, you have to replace it.
The light boost IC--B controls the
backlight on the left side of the iPhone display screen,
it controlled by three sets of signals: PP_LCAM_BL34_ANODE(10.5V cathode power
supply), PP_LCM_BL_CAT3 and PP_LCM_BL_CAT4. If these three sets of signals
don't work or the light boost IC-- B damage will cause iPhone left screen won't
lit.
The light boost IC-- B external two sets of
diodes and boost inductors, the iPhone 6 only has one set. Because iPhone 6S
has one more function, its front camera comes with flash light, and it is
provided by the newly added set of rectifier diodes and boost inductors. So, if
one of them is damaged, it will cause boost light IC--B was burned, you have to
replace it by using QUICK 861DW and
Precision Titanium Alloy Tweezers.
The boost inductance of the lighting part
is integrated in an IC (Inductive integrated IC)， this IC integrates
the inductance for lighting part, the display part, the charging part and the
ring-tone part. The damaged inductive integrated IC will cause iPhone no
backlight no display issues, and will cause iPhone no charge, no ringtone and
no vibration failures.
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