Only For Training And Service Purposes - LG GB220 Service Manual

4. TROUBLE SHOOTING
CHECKING FLOW
START
Does the SIM card
support 3V or 1.8V ?
YES
Is Voltage at the pin1
of J200 2.85V 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
LGE Internal Use Only
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 J200
NO Redownload SW.
Does it work
Properly?
YES
SIM card is properly working.
- 98 -
NO
Change the U101
NO
Change the main board
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes