Samsung GT-i9003 Service Manual page 78

8-3-18. WCDMA Band8 / GSM900 RX
NORMAL CONDITION
catch the channel?
Check C115 ≤ -65dBm ?
Check the Voltage at
C130 =V_BAT
Check L108,L109
≥ -65dBm ?
Check L103,L104,C110
≥ -65dBm ?
Check C112,C114,L101
≥ -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 ?
GSM900/BAND8 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
L108,L109
resolder or change
F107,L103,L104,C110
resolder or change
F100,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
8-49
Level 3 Repair
CONTINUOUS RX ON
RF INPUT : 9800CH
AMP : -50dBm