Samsung GT-i9003 Service Manual page 72

8-3-15. GSM1800 RX
NORMAL CONDITION
catch the channel?
Check C115 ≤ -65dBm ?
Check the Voltage at
C130 =V_BAT
Check C135 ≥ -65dBm ?
Check C133,C132,C136
≥ -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 ?
GSM1800 Receiver is O.K?
END
NO
YES
NO
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
U102
resolder or change
F102,C133,C132,C136
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
8-43
Level 3 Repair