4. TROUBLE SHOOTING
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START
Is Voltage at the TP1
1.8V or 3V?
Resolder U202
No
Does the SIM card
Support 1.8V or 3V ?
Change the SIM Card.
This phone supports 1.8V or 3V SIM card.
No
Yes
Yes
SIM card is properly working
Change the main board
Change the
SIM Card and try again.
Does it work
Properly?
Redownload SW.
Does it work
Properly?
Is Voltage at the TP2
1.8V or 3V?
SIM card is properly working.
Yes
Yes
No
No