Gsm1800, Gsm1900 Rx Troubles - Samsung GT-I8150 Service Manual

Level 3 Repair
8-3-15. GSM1800, GSM1900 RX
NORMAL CONDITION
catch the channel?
Check L121 ≤ -65dBm ?
Check the Voltage at
L135 = 2.6V
L103,L127,L132,L133
≥ -65dBm ?
Check the voltage at
{C318,C319=2.2V ?}
{C321,C322,C324,C325,C3
26,C327=1.3V ?}
Check the freq. at
OSC500 : 19.2MHz ?
GSM1800/1900 Receiver is O.K?
NO
YES
NO
NO
YES
Check
NO
YES
NO
&
YES
NO
YES
NO
YES
END
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CHECK soldered
RFS100,L101,L121,C107,C159
resolder or change
L135, U502
resolder or change
FEM100,L103,L127,L132,L133
resolder or change
U502
change or resolder
OSC500
resolder or change
U300
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