Gsm850/Gsm900 Tx - Samsung GT-i9100 Service Manual

8-3-17. GSM850/GSM900 TX

U101 PIN11 : About
30dBm ?
Check the Voltage at
C102 = VOUT_CHARGER?
Check C120, L110, L113
: About 30dBm ?
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 ?
GSM850/900 Transmitter is O.K?
END
YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
YES
NO
YES
NO
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CHECK soldered
- RFS100,L107,C107,L108,
C106,C104,C105,ANT100
Resolder or change
U101, C102
Resolder or change
C120, L110, L113
Resolder or change
PAM100, R741, C117
Resolder or change
C125, L112
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-47
Level 3 Repair
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