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9. Flow Chart of Troubleshooting
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9-1
9-1. Power On
Yes
Yes
Check the initial operation
Check the +VDD_GSM_CORE circuit
C433(+VDD_GSM_CORE)
= 1.2V
No
C403(+VDD_IO_LOW) &
C405(+VDD_IO_HIGH) = "H"
Yes
No
Check the Clock at
R405=32KHz
Yes
No
Change the PMIC(U403)
Yes
No
END
Change the Battery
' Power On ' does not work
Check the Battery Voltage
is more than 3.5V
Yes
Resolder OSC400
Summary of Contents for SGH-E740S
Page 35: ...8 PCB Diagrams 8 1 Top ...
Page 36: ...PCB Diagrams 8 2 Bottom ...