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CHECKING FLOW
START
Does the SIM card
support 3V or 1.8V ?
YES
Is Voltage at the pin1
of J100 2.88V or 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 3V or 1.8V SIM card.
NO
Voltage output of TP1
Is 2.88V?
YES
Resolder TP2
NO
redownload SW.
Does it work
Properly?
YES
SIM card is
properly working.
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4. TROUBLE SHOOTING
NO
Change the U100
NO
Change the main board
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