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9. Flow Chart of Troubleshooting
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9-1
9-1. Power On
Check the Battery Voltage
is more than 3.4V
' Power On ' does not work
Change the Battery
END
No
Yes
C421(VISA) = 2.7V?
Check the PMU related to VINT
No
Yes
Check the Clock at
R404=32KHZ
Resolder OSC400
No
Yes
C401(+VDD_IO_LOW_1.8V) &
C402(+VDD_IO_HIGH_2.8V) =
"H"?
Check the related circuit
No
C426(+VDD_GSM_CORE_1.2V)
= 1.2V?
Check the +VDD_GSM_CORE_1.2V
circuit
No
Yes
Check the initial operation
Yes
Yes
Yes