Samsung SGH-T429 Service Manual - Page 33

Flow Chart of Troubleshooting

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9. Flow Chart of Troubleshooting 9-1. Power On ' Power On ' does not work Yes Check the Battery Voltage No is more than 3.4V Yes No C323(VISA) = 2.7V? Yes Check the Clock at No R308=32KHZ Yes C303(+VDD_IO_LOW) & No C305(+VDD_IO_HIGH) = "H"? Yes No C329(+VDD_GSM_CORE) = 1.8V? Yes Change the Battery Check the PMU related to VINT Resolder OSC300 Check the related circuit Check the +VDD_GSM_CORE circuit Check for the clock at C125 = 26MHz Yes Check the initial operation Yes END No Check the clock generation circuit (related to U101) 9-1 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization

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SAMSUNG Proprietary-Contents may change without notice
9. Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
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
C323(VISA) = 2.7V?
Check the PMU related to VINT
No
Yes
Check the Clock at
R308=32KHZ
Resolder OSC300
No
Yes
C303(+VDD_IO_LOW) &
C305(+VDD_IO_HIGH) = "H"?
Check the related circuit
No
Yes
C329(+VDD_GSM_CORE)
= 1.8V?
Check the +VDD_GSM_CORE circuit
No
Yes
Check for the clock at C125
= 26MHz
Check the clock generation circuit
(related to U101)
No
Yes
Check the initial operation
Yes
Yes