Flow Chart Of Troubleshooting - Samsung SGH-T509 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
C410(VINT) = 2.7V?
Check the Clock at
R401=32KHZ
TA425(+VDD_IO_LOW) &
C424(+VDD_IO_HIGH) = "H"?
C427(+VDD_GSM_CORE)
= 1.8V?
Check for the clock at C320
= 26MHz
Check the initial operation
END
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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No
Change the Battery
No
Check the PMU related to VINT
No
Resolder OSC400
No
Check the related circuit
No
Check the +VDD_GSM_CORE circuit
No
Check the clock generation circuit
(related to U102)
7-1