Samsung SGH E590 Service Manual - Page 38

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 3.7V Yes C426(VISA) = 2.6V? Yes No Change the Battery No Check the PMU related to VINT Check the Clock at R404=32KHZ Yes C404(+VDD_IO_LOW) & C406(+VDD_IO_HIGH) = "H"? Yes No Resolder OSC400 No Check the related circuit C204(+VDD_GSM_CORE) = 1.2V? Yes No Check the +VDD_GSM_CORE circuit 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 3.7V
' Power On ' does not work
Change the Battery
END
No
Yes
C426(VISA) = 2.6V?
Check the PMU related to VINT
No
Yes
Check the Clock at
R404=32KHZ
Resolder OSC400
No
Yes
C404(+VDD_IO_LOW) &
C406(+VDD_IO_HIGH) = "H"?
Check the related circuit
No
Yes
C204(+VDD_GSM_CORE)
= 1.2V?
Check the +VDD_GSM_CORE circuit
No
Yes
Check the initial operation
Yes
Yes