Samsung GT-i8910 Service Manual page 40

9-1-2 : Abnormal initial operation (Normal +4.0V voltage source)
Press PWR KEY
TP_590
is exist?
C576 voltage level
= 1.1~1.3V?
C581 voltage level
= 1.8V?
TR401 pin3
output is asserted?
U301 pin4
output is asserted?
YES
YES
YES
YES
YES
END
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NO
Check OSC501 and
neighboring circuits
NO
Check L507 and neighboring
NO
Check L509 and neighboring
NO
and neighboring circuits
NO
and neighboring circuits
if necessary change the board
9-3
Flow Chart of Troubleshooting
circuits
circuits
Check TR401
Check U301