- 108 -
LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
CHECKING FLOW
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 U201
NO
YES
Resolder J301
YES
Voltage output
of VSIM LDO (TP01)
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.
SIM_1( J301) START