Flow Chart Of Troubleshooting - Samsung SGH-X490 Service Manual

7. Flow Chart of Troubleshooting

7-1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C315(V_ I SUP) = 2.7V?
Check the Clock at
R306 = 3 2KH Z
C340 (VDD1) = " H " ?
C339(VDD2) & C338(VDD3)
= 2.85V ?
Check for the clock at C135
= 13MHz
Check the initial operation
END
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No
Change the Battery
No
Check the PMU related to V_ I SUP
No
Resolder X300
No
Check the VDD1 circuit
No
Check the VDD2 , V DD3 circuit
No
Check the clock generation circuit
(related to U101)
7- 1