Sim Detect Troubleshooting - LG CU500 Service Manual

4. TROUBLE SHOOTING

4.10 SIM Detect Troubleshooting

USIM Initial sequence of CU500 is :
USIM_CLK,USIM_RST,USIM_DATA triggered → VREG_UIM_2.85V go to 3.0V → USIM IF work
Re-insert the SIM card
Work well?
VREG_UIM_2.85V is 3.0V?
USIM_P_CLK is run?
Change SIM card
Work well?
Change the Main board
Start
Yes
No
NO
YES
Yes
No
USIM_P_DATA
USIM_P_CLK
End
Check CON500
End
USIM_P_RST_N
- 100 -
Ground
VREG_UIM_2.85