Samsung SGH-X105 Service Manual page 11

4 . S G H - X 1 0 5 Fl o w
1. Power On
' Power O n ' does not work
C heck the current consum ption
Current consumption
>=100mA
C heck the V bat. Voltage
Voltage >= 3.3V
C heck the pin of U100
pin#11 >= 2.8V
pin#39 and pin#33 =
2.8V
C heck the clock
signal at pin4 of
O SC 400
Freq = 13M H z ,
Vrms ¡Ã300mV
and
Vpp = 900m Vpp
Check the initial operation
C h a r t o f T r o u b l e s h o o t i n g
Y es
Y es
Y es
Y es
Y es
Y es
END
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No
D ownload again
No
C harge the Battery
No
C heck U100 and C116
No
No
pin#9 = 1.8V
No
C heck the clock generation circuit
(related to O SC 400, U401 pin 19)
4- 1
C heck U100 and C115