Wcdma Band8 / Gsm900 Rx - Samsung GT-i9100 Service Manual

8-3-16. WCDMA Band8 / GSM900 RX

NORMAL CONDITION
catch the channel?
Check C107 ≤ -65dBm ?
Check the Voltage at
C102 =VOUT_CHARGER
Check L104, L105
≥ -65dBm ?
Check component
soldering status OK at
F100
Check F100 PIN 22, 23
≥ -65dBm
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 ?
WCDMA band8/GSM900
Receiver is O.K?
END
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
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CHECK soldered
RFS100, L107,C107,L108
Resolder or change
U101, C102
Resolder or change
L104, L105
Resolder or change
F100
Resolder or change
F100
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-45
Level 3 Repair
CONTINUOUS RX ON
RF INPUT : 3013CH
AMP : -50dBm