LG GS290 Service Manual page 41

4. TROUBLE SHOOTING
SIM CONNECTOR
VSIM_2V9 VSIM_2V9
J400
R407
4
10K C5
5
C6
6
SIM_IO C7
10
GND4 GND1
9
C405
GND3 GND2
22p
GCA26D-6S-H18-E1500
START
Check All of SIM card voltage
GS290 support
2.9V SIM only
No
Resolder pin
6 pins are
soldered well?
Yes
Yes Replace Main Board
Check Proper SIM
Card
Assemble
LGE Internal Use Only - 82 -
VSIM_2V9
1
C1
2
C2 SIM_RST
3
C3 SIM_CLK
7
8
C401 C410 C409
0.1u 22p DNI
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
uSD Check Points
-Power is working
-Socket soldering
-Card detect is working
MMC-DETECT PIN
MMC_DETECT SIGNAL
Card insert
Copyright © 2010 LG Electronics. Inc. All right reserved. - 83 -
Only for training and service purposes
4. TROUBLE SHOOTING
TP3 TP4
TP2
TP1
Card Deject
LGE Internal Use Only