LG GU280 Service Manual page 43

4. TROUBLE SHOOTING
4.3.3 Checking GSM Rx part
Re-download & Calibration
LGE Internal Use Only
Checking Flow
START
Check TP1~4
Signal exist?
Yes
Rx Still has problem?
Yes
Checking Points
TP1 TP2 TP3
No
Check FEM &
Soldering of TPs
No
GSM/DCS/PCS Rx is OK.
TP4
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Only for training and service purposes