LG GD580 Service Manual page 152

4.18.6 Checking RX I,Q
To verify the RX path you have to check the pk-pk level and the shape of the
RX I,Q.
WRX_I_
P (PIN 4)
WRX_I_N (PIN 3)
Figure 4-18-13. RF3100, WCDMA Transceiver (Bottom)
Figure 4-18-14. RX I,Q signal (CW:2142MHz)
Figure 4-18-15. RX I, Q signal
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Only for training and service purposes
WRX_Q_P(PIN 2)
Feed a CW signal at 2142MHz
with a power level of –60dBm.
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4. Trouble Shooting
WRX_Q_
N(PIN 1)
About 2 MHz
WRX_Q_P (PIN 2)
WRX_Q_N (PIN 1)
WRX_I_P (PIN 4)
WRX_I_N (PIN 3)
LGE Internal Use Only