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9. Flow Chart of Troubleshooting
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9-
1
9-1. Power On
Check the Battery Voltage
is more than 3.4V
' Power On ' does not work
Change the Battery
END
No
Yes
C408(VINT) = 2.7V?
Check the PMU related to VINT
No
Yes
Check the Clock at
R402=32KHz
Resolder OSC400
No
Yes
C424, C425 = "H"?
C424(VDD_IO_HIGH : 2.9V)
C425 (VDD_IO_LOW :1.8V)
Check the related citcuit
No
Yes
C401(VDD_GSM_CORE)
= 1.875V?
Check the VDD_GSM_CORE circuit
No
Yes
Check for the clock at C116
= 26MHz
No
Yes
Check the initial operation
Yes
Yes
Check the clock generation circuit
(related to U102)
Summary of Contents for SGH-E780
Page 9: ...Specification 2 4 ...