Sim Detect Trouble - LG U8500 Service Manual

4.10 SIM Detect Trouble

USB Initial sequence of U8500 is :
VREG_USIM_2.85V(C409 of PM6650) go to 3.0V -> USIM_CLK,USIM_RST,USIM_DATA triggered ->
USIM IF work(Schematic and place are refer to SIM technical brief)
VREG_USIM_2.85V(J300 Pin 1)
U300
Start
Re-insert the SIM card
Work well?
No
VREG_USIM_2.85V is 3.0V?
USIM_P_CLK is run?
YES
Change SIM card
Work well?
No
Change the Main board
- 101 -
4. TROUBLE SHOOTING
Yes
End
Check J300,U300
NO
TP208,TP209,
VREG_USIM_2.85V
Yes
End
USIM_P_RST
(J300 Pin 2)
USIM_P_CLK
(J300 Pin 3)
USIM_P_DATA
(U408 Pin 6)