Gsm1800 Rx - Samsung GT-P5200 Service Manual

Level 3 Repair

8-3-18. GSM1800 RX

NORMAL CONDITION
catch the channel?
Check C1023 ≤ -65dBm ?
Check the Voltage at
C1014 = 2.85V ?
Check L1007
≥ -65dBm ?
Check component
soldering status OK at
F1000
Check F1000 PIN 18, 19
≥ -65dBm
Check the voltage at
{C1057 = VBAT_RF ?}
& {C1056 = 2.85V ?}
& {C1054 = 2.65V ?}
& {C1058 = 1.8V?}
& {C1059 = 1.2V?}
Check the freq. at
OSC1000 PIN 1 or PIN
3 : 26MHz ?
GSM 1800
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
L1004, C1023, C1026, RFS1000
Resolder or change
U1000, C1014
Resolder or change
Check L1007
Resolder or change
F1000
Resolder or change
F1000
Resolder or change
U1004
Change or resolder
OSC1000
Resolder or change
UCP3000
8-42
CONTINUOUS RX ON
RF INPUT : 69 8CH
AMP : -50dBm