4. TROUBLE SHOOTING
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CHECKING FLOW
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 pin#1
of J301 2.85V or 1.8V?
NO
Change the U102
NO
YES
Resolder J301
YES
Voltage output
of VSIM LDO (TP01)
Is 2.85V?
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.