Wcdma Band2 / Gsm1900 Rx - Samsung GT-P3100 Servise Manual

Level 3 Repair

8-3-18. WCDMA Band2 / GSM1900 RX

NORMAL CONDITION
catch the channel?
Check C116 ≤ -65dBm ?
Check the Voltage at
C103 = V_BAT?
Check L102, L105
≥ -65dBm ?
Check component
soldering status OK at
F100
Check F100 PIN 16, 17
≥ -65dBm
Check the voltage at
{C150= VBAT_RF ?}
& {C158, C159 C160 =
V_BAT?}
& {C149, C170 = 2.85V ?}
& {C145, C165 = 2.65V ?}
& {C148, C172 = 1.8V?}
& {C166, C171, C147) = 1.2V?}
Check the freq. at C137
: 26MHz ?
WCDMA B2 / GSM1900
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
CN100, C116, L108, C119
Resolder or change
U101, C103
Resolder or change
L102, L105
Resolder or change
F100
Resolder or change
F100
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-44
CONTINUOUS RX ON
RF INPUT : 9880CH
AMP : -50dBm