Some people must think this is very strange
which the right display screen is black while the left normally
displays, and when the right screen turns black, it still shows nothing after
awakening it. Please calm down and first we can confirm that is not the
supernatural events. Usually we called this phenomenon as yin yang screen and
most of this case was caused by abnormal
backlight circuit. Now, let's see what's going on.
First, let’s start from the backlight
circuit. After removing the motherboard by phone opening tools, we find
that the right backlight chip is painted green UV Solder Resist and
soldered a jumper wire. The wire starts from pin A1 U1580 backlight chip to the
yellow point near the fingerprint socket J2118, as shown in picture 1-1.
1-1
Second, the I2C bus that left backlightchip uses and the I2C bus that right backlight chip uses are not the
same circuit. The left one is normal while the right one is not, even after the
right backlight chip is replaced. Thus, we doubt that there is something wrong
with I2C bus of the right backlight chip. The two backlight chips’ real
material object are shown in picture 1-2.
1-2
Third, observing the screw under
microscope, we find that right and left screw holes are twisted through,
as shown in picture 1-3.
1-3
Finally, use knife to scratch left
screw hole, we find that it still connects. While the right one disconnects, as
shown in picture 1-4. Fixing the broken circuit and turn it on. The right
screen of iPhone 6 Plus shows light, and your iPhone 6 Plus back to normal.
1-4
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