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7. SGH-D500 Flow Chart of Troubleshooting
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7-1
1. Power On
Check the Battery Voltage
is more than 3.4V
' Power On ' does not work
Change the Battery
END
No
Yes
C406(VINT) = 2.7V?
Check the PMU related to VINT
No
Yes
Check the Clock at
R403=32KHZ
Resolder OSC400
No
Yes
C427(+VDD_IO_LOW) &
C426(+VDD_IO_HIGH) = "H"?
Check the related circuit
No
Yes
C403(+VDD_GSM_CORE)
= 1.8V?
Check the +VDD_GSM_CORE circuit
No
Yes
Check for the clock at C129
= 26MHz
Check the clock generation circuit
(related to U101)
No
Yes
Check the initial operation
Yes
Yes