Share How to Salve My iphone 6 Touch Screen Dead

1. How to Solve My iPhone 6 Touch Screen Dead
How to fix iPhone 6 Touchscreen not working. Here are
several solutions for fix iphone or phone touchscreen is
unresponsive. Vipprogrammer.com has high quality
product and perfect survice provice you the specific
methods, which is to get your phone back to work again.
Hoping you will benefit from it.
Problem:
IPhone 6 touch function is completely lost.
Repair Process:
1. Enter system to test, finding the touch function is
completely lost. After replacing a display screen, the
result is the same. Remove the motherboard and observe,
finding little soldering paste around touch process chip,
which suggests touch control chip and touch process chip
have been welded.

2. 2. First measure the diode data of two ends of coupling
capacitor that is used to communicate between touch
control chip and touch process chip. The data is normal.
One end of coupling capacitor near touch control chip is
connected to touch control chip, while the other end of
coupling capacitor near touch process chip is connected
to touch process chip.

3. 3. Next, measure the power supply voltage of
PN5V7_SAGE_AVDDH, PP5V7_SAGE_AVDDH,
PP5V1_GRAPE_VDDH and PP1V8_GRAPE. The
relevant circuit diagram.

4. 4. After measuring, we find touch control chip ‘s
PP5V1_GRAPE_VDDH and PP1V8_GRAPE have no
voltage, which suggests there is abnormal
communication between CPU and touch control chip.
Generally, the damage of touch control chip or abnormal
weld and the SPI bus, clock and reset between touch
control chip and CPU. Measuring points are the yellow
points shown in below picture.
5. After measuring, the diode data of these points is
normal, so there is no problem in communication bus
circuit between CPU and touch control chip. Then power
on again to test the 32kHz crystal oscillator, finding no
voltage. If 32kHz crystal oscillator is normal, there
should be 0.9v voltage.
The material object is shown in below picture.

5. 6. The function of 32kHz crystal oscillator is to send its
frequency to main power chip. Then main power chip
sends its clock signal to CPU. After receiving the clock
signal from main power chip, CPU sends it to touch
control chip clock signal. Find the clock pin of touch
control chip and measure the diode data. The data is
normal. Therefore, CPU has no problem. The damage of

6. 32kHz crystal oscillator and the faulty chips that use
32kHz clock will cause the abnormal of 32 kHz clock,
especially the Wi-Fi parts.
7. Replace crystal oscillator and power chip first, finding
the problem is still the same. Then remove WiFi chip and
measure. Now the 32 kHz clock has 0.9v voltage. After
assemble touch control chip, the touch function becomes
normal. Trouble is removed.