Sim Detect Trouble - LG U8210 Service Manual

4. TROUBLE SHOOTING

4.12 SIM Detect Trouble

USB Initial sequence of U8210 is :
USIM_CLK,USIM_RST,USIM_DATA triggered → VREG_USIM_2.85V go to 3.0V → USIM IF work
Start
Re-insert the SIM card
Work well?
VREG_USIM_2.85V is 3.0V?
USIM_P_CLK is run?
Change SIM card
Work well?
Change the Main board
VREG _USIM_2.85V(U408 Pin 5)
USIM_P_RST(U408 Pin 3)
USIM_P_CLK(U408 Pin 1)
Yes
No
NO
YES
Yes
No
- 112 -
End
Check U407,
U408
End
USIM_P_DATA
(U408 Pin 6)