LG KP170 - Page 66

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4. TROUBLE SHOOTING
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START
Does the SIM card
support 3V or 1.8V
?
NO
Change the SIM Card.
This phone supports 3V or 1.8V SIM car
d.
YES
Is Voltage at the pin1, pin6
of J400 2.85V or 1.8V?
NO
Change the U102
NO
YES
Resolder J400
YES
Voltage output
of VSIM LDO
Is 2.85V?
Change the SIM Card
And try again.
Does it work
Properly?
YE
S
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