Only For Training And Service Purposes - LG KP175 Service Manual

CHECKING FLOW
START
Does the SIM card
support 3V or 1.8V ?
YES
Is Voltage at the pin1, pin6
of J400 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.
NO Voltage output
of VSIM LDO
Is 2.85V?
YES
Resolder J400
NO Redownload SW.
Does it work
Properly?
YES
SIM card is properly working.
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4. TROUBLE SHOOTING
NO
Change the U102
NO
Change the main board
LGE Internal Use Only