Gsm1800 Rx - Samsung GT-I9300 Service Manual

8-3-19. GSM1800 RX

NORMAL CONDITION
catch the channel?
Check C117 ≤ -65dBm ?
Check the Voltage at
C110 = VBATT ?
Check C112
≥ -65dBm ?
Check component
soldering status OK at
F100
Check F100 PIN 18, 19
≥ -65dBm
Check the voltage at
{C148= VOUT_CHARGER ?}
& {C158,C159, C160
= VOUT_CHARGER?}
& {C147, C172 = 2.85V ?}
& {C144, C170 = 2.65V ?}
& {C146, C174 = 1.8V?}
& {C173, C171, C145 = 1.2V?}
Check the freq. at
OSC100 PIN 1 : 26MHz ?
GSM1800 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
RFS100, L109, C116, C117
Resolder or change
U103, C110
Resolder or change
C112
Resolder or change
F100
Resolder or change
F100
Resolder or change
U108
Change or resolder
OSC100
Resolder or change
UCP300
8-67
Level 3 Repair