IPhone 6 has a white apple logo on the screen when turning it on. This screen has been replaced after falling. How should we repair the problem? Let's check the expert repair process in this article, hope it will help!
According to our past
repair experience, we know that the dropped device should be directly checked
on its CPU parts. First of all, check the bus and reset, both of them are
normal. Cut the shiled cover above the fingerprint, use
Fluke 15B+ digital multimeter to measure the resistance of CPU to
the clock and data.
The normal values
of R0317 and R0316 are more than 400, the measurement of R0317 resistance is
745, and the R0316 is 479. This case is mostly the two pin of AP31 and AR31 in
the right lower right corner of CPU has pseudo soldering. First press the iPhone 6 CPU to test whether the device can turn
on or not, do not try to reflash the phone first, it will report error 9. Of
course, the best method for CPU pseudo soldering is redo the parts, here we try
a method of jumper wire connection without removing CPU necessary (6 and 6P can
be common used).
As shown in
picture 17-1-1 , look at the position of the two
points on the wuxinji schematic diagram,
the lower right corner is 0, the width is 1.45MM (the width of 4 solder
joints), the height is 1.75MM (the height of the 7 solder joints), which can be
slightly shaved on this basis, first probably draw a rectangle. When the upper
cover is very hard, do not use brute force, select a sharp phone repair blade,
you should slow down when finish scraping on the white pad from cover to the
CPU upper cover, after scraping the white pad, the point we are looking for
will come out, the wire on the CPU chip must be operated under the HDMI Camera microscope.
First test the
resistance of the two points. If normal, smear green oil on the top (except for
the two points we are going to connect jumper wire). After the curing we can
connect jumper wire, use QUICK TR1300A hot air gun to blow very small tin balls on the 2
points respectively , we choose to use the wire of the receiver, it's thinner,
the receiver wire is with glue, scrape the 2 ends and apply a little solder. As
shown in picture 17-1-2 .
Use jumper wire
on the corresponding two points separately. ( it's better to do on both two
points to avoid rework repair). Once you finish flying, just apply the green
oil and use UV light for curing.
Other professional iPhone repair information, please contact on www.vipfixphone.com
Other professional iPhone repair information, please contact on www.vipfixphone.com
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