LG H990ds - SIM Card Interface Troubleshooting

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3. TROUBLE SHOOTING
Trouble shooting when SIM2 does not work
3.20 SIM Card interface trouble
Circuit Diagram
TP1
START
Does the SIM card
support 3V or 1.8V ?
NO
Change the SIM Card.
Only supports 3V or
1.8V SIM card.
YES
Check the voltage
Level at TP1 or TP2 Is
3V or 1.8V?
NO
Change the SIM Card.
Or Re-download
Or Re-solder J9600
YES
SIM Card will work
properly.
TP1
BOTTOM
93