Samsung SGH-S108 Service Manual page 28

SGH-S108 Exploded view and its Part list
10. TX_DCS
F1002 pin#7:
about 2~3
dBm?
YES
CON1, C1000
check&change
U1001
pin#3,#6=3.7 V?
U1001
pin#2=1.2V?
NO
U1001
pin#8≒-5dBm?
U1001
pin#7=3V?
U1001
change or solder again
U100 pin#46,C114
change or solder again
NO
#6,#7,#8 =1.7V ?
U700
change
change or solder again
NO
F1002
pin#11= 2.85
V?
YES
U1001 pin#5:
≒4~5dBm?
NO
YES
F1002
check & replace
NO
BATTERY, U100
check & change
YES
NO
YES
YES
NO
YES
YES
U700
check
NO
U901
pin#14,#23,#26,
##32 = 2.8V?
YES
NO
U901pin#9,
U902#pin5,
#10,#12,#13
#25,#28 = 3V ?
=-20dBm ?
YES
U901pin#5,
pin #7=13MHz?
Vp-p=950mV
YES
U1001
pin#9,#10,#11,
#12,#13 = 3V?
change or solder again
SAMSUNG Proprietary-Contents may change without notice
NO
U700,U702
check & change
NO
U1000
pin#4,#9=3V?
YES
NO
U1000
pin#5,#6,#7=1.2
V?
YES
NO
U1000
pin#13≒-20dBm?
YES
NO
U1000
pin#16=1.2V?
NO
U100 pin#39,C116
change or solder again
YES
NO
U902
YES
NO
U902
U700
check or change
YES
U901
2-10
CONTINUOUS TX ON CONDITION
TX POWER DAC:500 CODE APPLIED
CH:698CH
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
U100 pin#44, C115
check & replace
U700
check
F1000
check & replace
U1000
check or solder again
NO
OSC801
pin #3=13MHz?
change or solder again
Vp-p=950mV
YES
NO
U100 pin#39,C116
OSC801
change or solder
pin #4 = 3V ?
YES
U902
change or solder again
OSC801
again