Flow Chart Of Troubleshooting - Samsung SGH-E750 Service Manual

7. Flow Chart of Troubleshooting

7-1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C430( + V DD _ I O _ L OW) &
C429( + V DD _ I O _ H IGH) = " H " ?
Check the Clock at
R402 = 3 2KH Z
C402( + V DD _ G SM _ C ORE)
= 1.8V ?
Check for the clock at C303
= 26MHz
Check the initial operation
Y e s
Y e s
Y e s
Y e s
Y e s
Y e s
Y e s
END
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No
Change the Battery
No
Change the PMU (U405)
No
Resolder OSC400
No
Check the + V DD _ G SM _ C ORE circuit
No
Check the clock generation circuit
(related to U100)
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