LG HB620 - SIM Detect Trouble

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Only for training and service purposes
4.3 SIM detect trouble
USB Initial sequence of HB620T is :
VREG_USIM_2.85V(C427 of PM6650) go to 2.85V → USIM clock, reset and data triggered
→ USIM IF work (Schematic and place are refer to SIM technical brief)
4. TROUBLE SHOOTING
- 78 -
Start
Work well?
VREG_USIM_2 .85V?
USIM_P_CLK is run?
Change the Main board
End
Check C427,C438
Yes
No
YES
N
O
Re- insert the SIM card
Change SIM card
Work well? End
Ye
s
No
Start
Work well?
VREG_USIM_2 .85V?
USIM_P_CLK is run?
Change the Main board
End
Check C427,C438
Yes
No
YES
N
O
Re- insert the SIM card
Change SIM card
Work well? End
Ye
s
No
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