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10. Flow Chart of Troubleshooting
10-1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C423(VISA) = 2.7V?
Check the Clock at
C401(+VDD_IO_LOW_1.8V) &
C402(+VDD_IO_HIGH_2.8V) =
C431(+VDD_GSM_CORE_1.2V)
Check the initial operation
Yes
Yes
Yes
R462=32KHZ
Yes
"H"?
Yes
= 1.2V?
Yes
Yes
END
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No
Change the Battery
No
Check the PMU related to VINT
No
Resolder OSC400
No
Check the related circuit
No
Check the +VDD_GSM_CORE_1.2V
10-1
circuit
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