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4. TROUBLE SHOOTING
CHECKING FLOW
START
Does the SIM cards
supports 3V ?
YES
Voltage at pin1 of
J300 is 2.85V?
YES
Change the SIM Card
And try again.
Does it work
Properly?
YES
Change SIM Card
LGE Internal Use Only
NO
Change the SIM Card. Our phone
supports only 3V SIM card.
NO
Voltage output
of VSIM LDO
Is 2.85V?
YES
Replace or Re-solder J300
NO
Redownload SW.
Does it work
Properly?
YES
SIM Card will be detected.
- 68 -
NO
Check the U101
NO
Change the main board
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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