LG -600 Service Manual page 37

GSM RF SAW
2nd FILTER U204 pin 4 or 6
Frequency & Power check
Frequency = 947.4MHz &
Power >= -68dBm
YES
VC-TCXO
U212 pin 3 13MHz
Oscillation check
Frequency = 13.00MHz &
Power >= -5dBm
YES
LO1 VCO
U210 pin 3
Frequency & Power check
Frequency = 1307.4MHz &
Power >= -15dBm
YES
RF MAIN CHIP
U203 pin 38 or 39
Frequency & Power check
Frequency = 360MHz &
Power >= -50dBm
YES
IF SAW FILTER
U200 pin 5 or 6
Frequency & Power check
Frequency = 360MHz &
Power >= -65dBm
NO
✔ U204 soldering check
✔ U204 change another same one
✔ U212 soldering check
✔ U212 pin 4 DC 2.8V + - 5% check
NO
✔ U212 pin 3 DC 1.4V + - 0.1V check
✔ U212 change another same one
✔ U210 soldering check
✔ U210 pin 4 DC 2.8V check
NO
✔ U210 pin 6 control signal check
( >= 0.7Vp-p )
✔ U210 pin 1 Low Voltage check
✔ U210 change another same one
NO
✔ U203 soldering check
✔ U203 change another same one
NO
✔ U200 soldering check
✔ U200 change another same one
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5. Data Kit & Test Method