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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Trouble shooting
GW520 service manual
5.5 SIM Detect Trouble
END
Do SIM_CLK(C246),
SIM_IO(C248), SIM_RST(C245)
Work well?
Cleck TP2
Change SIM Card
Work well?
END
Resolder J200
Check C223 or
Change U200
YES
YES
NO
YES
NO
NO
YES
Start
Change the main board
Check soldering
of J200
Is 2V9_SIM(C223)3.0V?
Check TP1
NO
Checking Flow
END
Do SIM_CLK(C246),
SIM_IO(C248), SIM_RST(C245)
Work well?
Cleck TP2
Change SIM Card
Work well?
END
Resolder J200
Check C223 or
Change U200
YES
YES
NO
YES
NO
NO
YES
Start
Change the main board
Check soldering
of J200
Is 2V9_SIM(C223)3.0V?
Check TP1
NO
END
Do SIM_CLK(C246),
SIM_IO(C248), SIM_RST(C245)
Work well?
Cleck TP2
Change SIM Card
Work well?
END
Resolder J200
Check C223 or
Change U200
YES
YES
NO
YES
NO
NO
YES
Start
Change the main board
Check soldering
of J200
Is 2V9_SIM(C223)3.0V?
Check TP1
NO
Checking Flow
SIM_CLK
SIM_RST
SIM_IO
(R246)
(C245)
(C248)
SIM_CLK
SIM_RST
SIM_IO
SIM_CLK
SIM_RST
SIM_IO
(R246)
(R246)
(C245)
(C245)
(C248)
(C248)