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6. SGH-S300 Flow Chart of Troubl
eshooti
ng and Circuit Di
agram s
6-1
1.Baseband
1. Pow er O N
Check the current
consum tion m ore than
100m A
Check the
V bat(
O)
V oltage m ore than
3.3V
Dow nloader again
N O
C harge the Battery
N O
C heck U 100 and C113
N O
YES
YES
YES
YES
'Pow er O n' does not
w ork
C heck the pin
15 of U 100 is m ore
than 2.8V
U 100 pin 46,39
= 2.8V
U 100 pin 13
= 1.8V
Check the clock signal
at
pin4 of U 801
Freq=13M H z ?
V rm s¡˘
¡300m V ?
V pp is around
900m V pp
Check the clock generation circuit
(related to O SC 801 and U 801)
N O
'Pow er O n' does not
w ork
YES
EN D
YES
C heck U 114 and C116
N O
C heck U 112
N O