Samsung SGH E250 Service Manual - Page 36

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 is more than 3.4V Yes C420(VISA) = 2.7V? Yes No Change the Battery No Check the PMU related to VINT Check the Clock at R410=32KHZ Yes C400(+VDD_IO_LOW) & C405(+VDD_IO_HIGH) = "H"? Yes No Resolder OSC400 No Check the related circuit C205(+VDD_GSM_CORE) = 1.8V? Yes No Check the +VDD_GSM_CORE circuit Check for the clock at C325 = 26MHz Yes No Check the clock generation circuit (related to U102) Check the initial operation Yes END 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
C420(VISA) = 2.7V?
Check the PMU related to VINT
No
Yes
Check the Clock at
R410=32KHZ
Resolder OSC400
No
Yes
C400(+VDD_IO_LOW) &
C405(+VDD_IO_HIGH) = "H"?
Check the related circuit
No
Yes
C205(+VDD_GSM_CORE)
= 1.8V?
Check the +VDD_GSM_CORE circuit
No
Yes
Check for the clock at C325
= 26MHz
Check the clock generation circuit
(related to U102)
No
Yes
Check the initial operation
Yes
Yes