Wcdma Band8 Tx - Samsung GT-i9100 Service Manual

Level 3 Repair

8-3-22. WCDMA BAND8 TX

Check U101 PIN11 :
About 22 dBm ?
Check the Voltage at
C102 = VOUT_CHARGER?
Check L104, L105 :
About 22dBm ?
Check component
soldering status OK at
F100
Check C129, C130 :
About 22dBm ?
Check the Voltage at
R741,C117=VOUT_CHARGER?
Check C125, L112 :
About 0dBm ?
Check the voltage at
{C138 = VOUT_CHARGER ?}
& {C169, C170, C171
= VOUT_CHARGER?}
& {C137, C174 = 2.85V ?}
& {C134, C176 = 2.65V ?}
& {C136, C178 = 1.8V?}
& {C135, C175, C173 = 1.2V?}
Check the freq. at C123
: 26MHz ?
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
YES
NO
YES
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CHECK soldered
- RFS100,L107,C107,L108,
C106,C104,C105,ANT100
Resolder or change
U101, C102
Resolder or change
L104, L105
Resolder or change
F100
Resolder or change
C129, C130
Resolder or change
PAM100, R741, C117
Resolder or change
C125, L112
Resolder or change
U104
Change or resolder
OSC100
8-60
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
WCDMA Band2 CH : 3013
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB