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Level 3 Repair
8-12
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8-3-4. Sim1 Part
SIM500 pin1 (C506)
≒
3.0V
or C509 > 2.99V ?
Phone can't access SIM Card
Resolder C506, C509
insert SIM card & access it,
then must be sim pin1 or C506 > 3.0V
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(C508) of SIM500 in a few
seconds.
(method : wiring pin 3 and
checking its waveform using an
oscilloscope)
Yes