Samsung GT-i9003 Service Manual page 85

Level 3 Repair
8-3-22. WCDMA BAND2 TX
Check U102 PIN1 :
About 22 dBm ?
Check the Voltage at
C131 = VBAT ?
Check C140,C143,L110 :
About 22dBm ?
Check C145, C147, C148,
F104_PIN3 About 22 dBm ?
Check the Voltage at
C125 = VBAT ?
C188 ≥ 2.95V ?
Check U103 pin 9
about 22dBm ?
Check U104 PIN2
about 8dBm ?
Check C144, F103 about
8dBm ?
Check the voltage at
{R106 = VBAT ?}
& {C158, U305 = 2.85V ?}
& {C159,C160,C325 = 1.8V?}
& {C330 = 2.85V ?}
Check the freq. at C185
: 26MHz ?
WCDMA 1900 Transmitter is O.K?
END
YES
NO
NO
YES
NO
NO
NO
NO
NO
YES
NO
NO
NO
NO
NO
YES
NO
YES
NO
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CHECK soldered
RFS100, L102,C115,C104,
C183, ANT102
resolder or change
U102 , C131
YES
resolder or change
C140,C143,L110
YES
resolder or change
C145, C147, C148, F104
resolder or change
U101 , U108
YES
resolder or change
U103
YES
resolder or change
C144, F103
resolder or change
U105
change or resolder
OSC100
resolder or change
UCP300
8-56
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB