Rx Sensitivity Trouble (E-Gsm) - LG -600 Service Manual

5.2.11 RX Sensitivity Trouble (E-GSM)

START
✔ HP8960 : Test mode
62CH, 7level setting ( TCH )
62CH, -60dBm setting ( BCCH )
✔ Spectrum analyzer setting
✔ Oscilloscope setting
RF Connector
U107 pin 1
Frequency & Power check
Frequency = 947.4 MHz &
Power >= -70dBm
ANT SWITCH
U103 pin 9
Frequency & Power check
Frequency = 947.4 MHz &
Power >= -70dBm
RF DUAL 1 'st
SAW FILTER FL1 pin 7
Frequency & Power check
Frequency = 947.4MHz &
Power >= -72dBm
LNA
U202 pin 9
Frequency & Power check
Frequency = 947.4MHz &
Power >= -55dBm
YES
YES
YES
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✔ U107 soldering check
NO
✔ Short check
✔ U107 change another same one
✔ U103 soldering check
NO
✔ U103 pin 4 LOW Voltage check
✔ U103 pin 14 LOW Voltage check
✔ U103 pin 11 HIGH Voltage check
✔ U103 change another same one
NO
✔ FL1 soldering check
✔ FL1 change another same one
✔ U202 soldering check
✔ U202 pin 8 DC 2.8V check
NO
✔ U202 pin 1 High Voltage check
✔ U202 pin 5 Low Voltage check
✔ U202 pin 10 High Voltage check
✔ U202 change another same one