Samsung GT-S8500 Service Manual page 53

8-3-14. GSM900 RX
NORMAL CONDITION
catch the channel?
Check C118 ≤ -65dBm ?
Check the Voltage at
C120 = 2.85V ?
Check both pad of L121
≥ -65dBm ?
F101 CHECK
pin6 or L110 ≥ -65dBm ?
F101 CHECK
pin1,8 or L111 ≥ -
65dBm ?
Check component
soldering status OK at
L111, C141, C151 ?
U302
{C314 = 2.2V ?}
& {C319 = 1.3V ?}
& {C360 = 2.3V ?}
& {C321 = 1.4V ?}
Check the freq. at C300
:19.2MHz ?
GSM900 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
CN100, C118, L102
U302, C341, C120
resolder or change
F100
resolder or change
L121, L110
resolder or change
F101
resolder or change
L111, C141, C151
resolder or change
U302
resolder or change
U300
change or resolder
U302
resolder or change
8-24
Level 3 Repair
CONTINUOUS RX ON
RF INPUT : 37CH
AMP : -50dBm