iPhone touchscreen
not working is a common problem. The touchscreen problem can occur in any model
of the iPhone. However, solution to the problem is easy. If you have little DIY
experience in assemble and disassemble (opening) any mobile phone then you can easily
solver this touchscreen problem in its any version. All models of iPhone till
now have a separate IC called “Touchscreen Controller” to handle the job.
However, Part Number of the IC in different Models of iPhone is different but
their location on the Logic Board and Function is same.
Here I explain
step-by-step easy to understand process on how to solve iPhone touchscreen
problem. The same solution applies to all models of iPhone including – Original
iPhone, iPhone 5S, iPhone 5C, iPhone 5, iPhone 4S, iPhone 4, iPhone 3GS, iPhone
3G.
Using precision
screwdriver, carefully remove all the screws from the housing of the iPhone and
keep them at a safe place.
Remove all the screws
from inside and carefully disassemble all the inside parts until you reach the
Logic Board of the iPhone. Remember the sequence of disassembly that will be
helpful when you assemble back the iPhone.
When you look at the
Logic Board of the iPhone, you will see an IC similar to the image below.
Remember, different models of the iPhone will have different part numbers on
the Touchscreen Controller IC. For e.g., the Part Number of iPhone 4S
Touchscreen Controller IC is – TI 343S0538.
Dry solder could be
one reason for the touchscreen problem. Using ESD-Safe Brush, apply good
quality no-clean flux on all sides of this particular IC.
Using Hot Air Blower,
give hot air all around the IC. Make sure to give hot air from some height. If
you give hot air from too close then the solder can melt. Our motive is to not
to melt the solder but to remove all the oxides from the solder joints.
Now using any good
PCB cleaning chemical like IPA solution, clean the logic board with the help of
ESD-Safe Brush.
Assemble back the
iPhone and check the touchscreen. It should work now.
If the problem is not
solved then you may have to replace the Touchscreen Controller IC (SMD).
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