Samsung GT-i9003 Service Manual page 76

8-3-17. WCDMA Band2 / GSM1900 RX
NORMAL CONDITION
catch the channel?
Check C115 ≤ -65dBm ?
Check the Voltage at
C130 =V_BAT
Check C140,L110,C143
≥ -65dBm ?
Check C110,L111,C102
≥ -65dBm ?
Check C137,C138,C139
≥ -65dBm ?
Check the voltage at
{C188 = RF_VDD_MAIN?}
Check the voltage at
{R106 = VBAT ?}
& {C158, C160 = 1.8V ?}
& {C161,151,C152,C153,
C154,C155,C157=2.85?}
Check the voltage at
{C324,L300,L301 = V_BAT ?}
& {L103,C317,C318,C319= 1.8V?}
Check the freq. at C185
: 26MHz ?
GSM1900/BAND2 Receiver is O.K?
END
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
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CHECK soldered
RFS100, L102,C115,C104
resolder or change
U102,C129,C130,C131,C134
resolder or change
C140,L110,C143
resolder or change
F104,C110,L111,C102
resolder or change
F102,U100
resolder or change
U108,U101,
C186,C188,C125,C124,R103,L106
resolder or change
U105
resolder or change
UCP300
change or resolder
OSC100
resolder or change
UCP300
8-47
Level 3 Repair
CONTINUOUS RX ON
RF INPUT : 9800CH
AMP : -50dBm