Checking Tx Iq Signals - LG T5100 Service Manual

4.3.4 Checking Tx IQ signals

Checking Points
U702
TXQN TXQP TXIP TXIN
Figure 65. TX I/Q
Tx IQ Circuit Diagram
Figure 66. TX I/Q Circuit
4. RF PART TROUBLESHOOTING
Checking Flow
Similar
Fig67?
Yes
Tx IQ is OK
Go to the next stage
Waveform
Fig. 36. Tx Burst
Figure 67. TX I/Q Waveform
- 81 -
Replace
No
U702