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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
C420(VISA) = 2.7V?
Check the PMU related to VINT
No
Yes
Check the Clock at
C416=32KHZ
Resolder OSC400
No
Yes
C400(VDD_IO_LOW_1.8V) &
C405(VDD_IO_HIGH_2.9V) =
"H"?
Check the related circuit
No
Yes
L400(VDD_GSM_CORE_1.2V)
= 1.8V?
Check the VDD_GSM_CORE_1.2V
circuit
No
Yes
Check for the clock at C110
= 26MHz
Check the clock generation circuit
(related to U106)
No
Yes
Check the initial operation
Yes
Yes
Summary of Contents for SGH-E250D
Page 23: ...Block Diagrams 7 2 ...
