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Level 3 Repair
8-13
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8-3-4. Sim Part
SIM
500
pin 1(C515)
≒
2.85V
Phone can't access SIM Card
Resolder C515 R519 V502
insert SIM card & access it,
then must be sim pin1 or C515 > 2.84V
Check the SIM Card
(look over if it get damaged.)
END
No
Yes
Yes
Yes
No
Resolder or Replace SIM500 connector.
(Because of not soldering well)
After Power ON,
Check SIM_CLK Signal on
pin3(C517) of SIM500 in a few
second
s.
(method : wiring pin 3 and
checking its waveform using an
Yes
No
Confirm an another PBA
After SIM card insert,
SIM500 pin 2( R518, SIM_RST)
≒
2.85V?
(method : wiring pin 3 and check
its waveform using an
oscilloscope)
Yes