LG -A290 Service Manual page 91

START
Does the SIM
card
Support 1.8 or
3.0V ?
Yes
Is Voltage at
the TP1
1.8V or 3V?
Yes
Change
the SIM Card
and try again.
Does it work
Properly?
Yes
SIM card is
properly working
LGE Internal Use Only
No
Change the SIM Card.
This phone supports 1.8V or 3.0V SIM card.
Voltage output
No
of VSIM LDO
Is 1.8V or 3V?
YES
Resolder S00
redownload
No
Does it work
Properly?
Yes
SIM card is
properly working.
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4. TROUBLE SHOOTING
No
No
SW.
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Change the main
board
Only for training and service purposes