Flow Chart Of Troubleshooting - Samsung SGH-E740S Service Manual

9. Flow Chart of Troubleshooting

9-1. Power On
' Power On ' does not work
Yes
Check the Battery Voltage
No
Change the Battery
is more than 3.5V
Yes
No
C403(+VDD_IO_LOW) &
Change the PMIC(U403)
C405(+VDD_IO_HIGH) = "H"
Yes
No
Check the Clock at
Resolder OSC400
R405=32KHz
Yes
No
C433(+VDD_GSM_CORE)
Check the +VDD_GSM_CORE circuit
= 1.2V
Yes
Check the initial operation
Yes
END
9-1
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