LG KG920 - Page 95

4. TROUBLE SHOOTING
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START
Does the SIM cards
supports 3V ?
NO
Change the SIM Card. Our phone
supports only 3V SIM card.
YES
Voltage at pin1 of
J300 is 2.85V?
NO
Resolder J300
NO
YES
Replace J300
YES
Voltage output
of VSIM LDO
Is 2.85V?
Change the SIM Card
And try again.
Does it work
Properly?
YES
Change SIM Card
Redownload SW.
Does it work
Properly?
NO
Change the main board
NO
YES
SIM Card will be detected.
Checking Flow
Figure 4-37.