Samsung GT-P6800 Servise Manual page 81

Level 3 Repair
8-3-19. GSM1800 RX
NORMAL CONDITION
catch the channel?
Check C111 ≤ -65dBm ?
Check the Voltage at
C109 = V_BAT ?
Check C110,L107
≥ -65dBm ?
Check component
soldering status OK at
Check F100 PIN 18, 19
≥ -65dBm
Check the voltage at
{C152 = VBAT_RF ?}
& {C159,C161 = V_BAT?}
& {C151, C167 = 2.85V ?}
& {C147, C164 = 2.65V ?}
& {C150, C169 = 1.8V?}
& {C149, C165, C168) = 1.2V?}
Check the freq. at C132
: 26MHz ?
GSM1800 Receiver is O.K?
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NO
YES
NO
NO
YES
NO
YES
NO
F100
YES
NO
YES
YES
NO
YES
NO
END
CHECK soldered
RFS100, C111,L105
Resolder or change
U101, C109
Resolder or change
C110,L107
Resolder or change
F100
Resolder or change
F100
NO
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-50