LG -C300 Service Manual page 96

CHECKING FLOW
START
Does the SIM card
support 3V or 1.8V ?
YES
Is Voltage
at the pin1 of J201
2.85V or 1.8V?
YES
Change the
SIM Card and try again.
Does it work
Properly?
YES
SIM card is
properly working
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Only for training and service purposes
NO
Change the SIM Card.
This phone supports 3V or 1.8V SIM card.
Voltage output
NO
of VSIM LDO
Is 2.85V?
YES
Resolder J401
NO redownload SW.
Does it work
Properly?
YES
SIM card is
properly working.
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4. TROUBLE SHOOTING
4. TROUBLE SHOOTING
NO
Change the U101
NO
Change the main board
LGE Internal Use Only