LG GB210 - Page 70

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Only for training and service purposes
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4. TROUBLE SHOOTING
START
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 TP1
of J300 2.85V?
NO
Change the U103
NO
YES
Resolder J300
YES
Voltage output
of VSIM LDO
Is 2.85V?
(CHECK TP2)
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.
CHECKING FLOW