Flow Chart Of Troubleshooting - Samsung SGH-X640 Service Manual

7. Flow Chart of Troubleshooting

1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C414(V_ISUP) = 2.7V?
Check the Clock at
R401=32KHZ
C431 (VDD1) = "H"?
C430(VDD2) & C429(VDD3)
= 2.8V?
Check for the clock at C126
= 13MHz
Check the initial operation
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
END
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No
Change the Battery
No
Check the PMU related to V_ISUP
No
Resolder X400
No
Check the VDD1 circuit
No
Check the VDD2,VDD3 circuit
No
Check the clock generation circuit
(related to U100)
7-1