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Flow Chart of Troubleshooting
9-1
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9. Flow Chart of Troubleshooting
9-1.Logic
9-1-1. Power on/off
YES
NO
NO
Check the Battery Voltage
is more than 3.3v
Check the current
consumption is
More than 100mA
Power On does not work
DOWN LOAD
Change the Battery
Check D400 pin
#3(PS_HOLD)=2.6V
YES
NO
Check the PMIC realated to PS_HOLD
Check the Clock at
OSC400=32KHz
YES
NO
Resolder OSC400
C422(V_MSMC_1.2)=1.2V?
NO
Check the U400
C429(V_MSME_1.8V)=1.8V?
C427(V_MSMP_2.6V)=2.6V?
C426(V_MSMA_2.6V)=2.6V?
C423(V_TCXO_2.85V)=2.8V?
Check the U400
NO
YES
NO
YES
Check the clock generation circuit
Check for the clock at
R415=19.2MHz
Check the initial operation
YES
END
YES
YES
YES