Samsung Wave GT-S8500, Service Manual, Page: 63 / 68

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Level 3 Repair
8-34
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8-3-21. WCDMA Band8 TX
F100 pin3:
about 20
dBm?
CN100,C118,L102
check & change
C120 :
2.85V?
U302
check & change
L110
about : 20 dBm
NO
NO
YES
YES
F101
change or resolder
C106,C143 =
3.8~4.2V ?
U101 pin 1 about :
-5dBm ?
YES
C149
about : -5dBm
NO
Check
DC bias
CONTINOUS TX ON CONDITION
TX POWER DAC:120 CODE APPLIED
CH : 3013
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
NO
U101
change or resolder
NO
YES
C149,C150,F102
change or resolder
U302
resolder or change
Check the freq. at
C300 :19.2MHz ?
U300
change or resolder
YES
YES
YES
Soldering state of U302 is O.K?
NO
U302
resolder or change
END
U302
{C314 = 2.2V ?}
& {C316 = 1.3V ?}
& {C360 = 2.3V ?}
& {C321 = 1.4V ?}
L122
about : 20 dBm
L121,L110,F100
change or resolder
NO
NO
NO
YES
NO
YES
YES