Wcdma Band8/Gsm900 Rx - Samsung GT-I9300 Service Manual

8-3-23. WCDMA Band8 / GSM900 RX
NORMAL CONDITION
catch the channel?
Check C117 ≤ -65dBm ?
Check the Voltage at
C110 = VBATT ?
Check L104, L106
≥ -65dBm ?
Check component
soldering status OK at
F100
Check F100 PIN 22, 23
≥ -65dBm
Check the voltage at
{C148= VOUT_CHARGER ?}
& {C158,C159, C160
= VOUT_CHARGER?}
& {C147, C172 = 2.85V ?}
& {C144, C170 = 2.65V ?}
& {C146, C174 = 1.8V?}
& {C173, C171, C145 = 1.2V?}
Check the freq. at
OSC100 PIN 1 : 26MHz ?
WCDMA band8/GSM900
Receiver is O.K?
END
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NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
CHECK soldered
RFS100, L109, C116, C117
Resolder or change
U103, C110
Resolder or change
L104, L106
Resolder or change
F100
Resolder or change
F100
Resolder or change
U108
Change or resolder
OSC100
Resolder or change
UCP300
8-75
Level 3 Repair
CONTINUOUS RX ON
RF INPUT : 3013CH
AMP : -50dBm