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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4.9 SIM Detect Troubleshooting
USIM Initial sequence of KF390 is :
USIM_CLK,USIM_RST,USIM_DATA triggered
→
VREG_UIM_2.85V go to 2.8V
→
USIM IF work
Start
Re-insert the SIM Card
Work Well ?
NO
YES
END
Change the Main board
Check VREG_USIM_2.85V &
USIM_P_CLK is run
YES
Work well ?
NO
NO
Check J300
( USIM Connector)
And PM6658
YES
END
Change the SIM card
USIM_P_DATA
VREG_USIM_2.85V
USIM_P_CLK
VREG_USIM_2.85V
USIM_P_DATA
USIM_RST_N
< Normal Operation >
Normal USIM_P_CLK
Abnormal USIM_P_CLK
USIM
56nH
L303
15K
R319
CLK
3
GND1
5
GND2
9
GND3
10
12
GND4
11
GND5
IO
7
2
RST
4
RSV1
8
RSV2
1
VCC
VPP
6
HSSC-8P-18
J300
22p
C348
EVLC18S02003
VA300
VREG_USIM_2.85V
0.1u
C349
ICVS0514X350FR
VA301
EVLC18S02003
VA302
USIM_P_CLK
USIM_P_RST_N
USIM_P_DATA
Figure. USIM part schematics
< above figure from damaged PM6685 >
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Содержание KF390
Страница 178: ...Note Z 3 X B O X C O M ...
Страница 179: ...Note Z 3 X B O X C O M ...