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