Sim Detect Trouble Shooting - LG KE590 Service Manual

4. TROUBLE SHOOTING

4.8 SIM Detect Trouble Shooting

SIM interface scheme is shown below. SIM_IO, SIM_CLK, SIM_RST ports are used to communicate
DBB with ABB and the Charge Pump in ABB enables 1.8V/3V SIM operation.
MEGA SIM SOCKET
MEGA_DAT0_28
SIM_CLK
SIM_RST
SIM_CLK : SIM Card reference clock
SIM_RST : SIM Card async/sync reset
SIM_IO : SIM Card bi-directional data line
LGE Internal Use Only
VBAT
VRSIM
R109 NA
V_28
R110
0
J100
10
GND2
R114 NA 4
MMC_DAT
R116 24 3
UCLK
2
URST
1
VDD
C120
C121
0.1u
C123
150p
150p
<Fig.1> SIM Circuit Diagram
R116
C120
C123
R110
C121
- 82 -
NOT MOUNT
U100 R1114D281D-TR-F
1 3
VDD VOUT
4 2
NC GND1
6 5
CE GND2 C113
NA
C114
NA
R111 NA
9
GND1
8
MMC_CMD
7
UIO
6
VPP_MMC_CLK
5
GND
SIM_CLK (R116)
(C123)
SIM_RST
SIM_IO
(C122)
SIM_PWRCTRL : SIM Card power activation
SIM_RnW : SIM Card data line direction
SIM_CD : SIM Card presence detection
Copyright © 2007 LG Electronics. Inc. All right reserved.
R113 10K
SIM_PWRCTRL
R115 NA
MEGA_CMD_28
SIM_IO
R118 NA
MEGA_CLK_28
C122
22p
Only for training and service purposes