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Flow Chart of Troubleshooting
9-1-2. Phone Part
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C913(VINT) = 2.7V?
Check the Clock at
R905 = 32KHZ
C925(+VDD_IO_LOW) &
C924(+VDD_IO_HIGH) = "H"?
C721(+VDD_GSM_CORE)
= 1.8V?
Check for the clock at C433
= 4.096MHz
Check the initial operation
END
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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No
Change the Battery
No
Check the PMU related to VINT
No
Resolder OSC900
No
Check the related circuit
No
Check the +VDD_GSM_CORE circuit
No
Check the clock generation circuit
9-4
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