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4. TROUBLE SHOOTING
CHECKING FLOW
START
Does the SIM card
Support 1.8V ?
YES
Is Voltage at the pin1
of TP1 1.8V?
YES
Change the
SIM Card and try again.
Does it work
Properly?
YES
SIM card is
properly working
LGE Internal Use Only
NO
Change the SIM Card.
This phone supports 1.8V SIM card.
NO
Voltage output
of VSIM LDO
Is 1.8V?
YES
Resolder TP1
NO
Redownload SW.
Does it work
Properly?
YES
SIM card is
properly working.
93/140
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4. TROUBLE SHOOTING
NO
Change the U102
NO
Change the main board
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Only for training and service purposes
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