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5. Flow Chart of Troubleshooting and Circuit Diagrams
5-1 Power ON
5-1
Flow Chart of Troubleshooting and Circuit Diagrams
'POWER ON'does not work
Charge the Battery
Check the Battery Voltage
is more than 3.4V?
No
Yes
Yes
C414 (V_ISUP)= 2.7V
Check the PMU related to V_ISUP
No
END
Check the Clock at R402=32 KHZ
Resolder X400
No
Yes
Check the initial operation
C431 (VDD1)="H"
Replace the PBA
No
Yes
Check for the clock at C136=13 MHZ
Check the clock generation circuit
(related to U107 and Q100)
No
Yes
Yes
C430(VDD2), C429(VDD3)=2.8V
Replace the PBA.
No
Yes