There is no service when inserting SIM card
on iPhone 5s.Is this make you feel strange? Let's find out where the problem
is.
Firstly, check “About iPhone”and found that
there is IMEI, modem firmware and ICCID, as shown in picture 1-1.
1-1
Secondly, iPhone does not show IMEI when
dial *#06#. Check operator and there is China Mobile, China Telecom but no
China Unicom (picture 1-2). Under normal circumstances, the three operators
will show up at the same time.
1-2
Finally, China Mobile and China Telecom
showing up suggests part of the signal channel circuit is normal. The trouble
is in baseband CPU. Remove the
baseband CPU and Reballing Stencil on it. Reassemble it and enter system
to test. IPhone has signal now and it is normal to call. Therefore, the problem
of iPhone 5s was been solved.
If you have any problem about the cell
phone ,you can consult Vipprogrammer.
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