LG KF690 Service Manual page 99

4. TROUBLE SHOOTING
- PCS 1900 Rx
Checking Switch Block power source
Check Soldering
ANT_SEL0, 1, 2 High Level
Check VDD
NO
2.5V < Voltgae < 3.0V
TP4 VREG_RF_SMPS
YES
Check the Logic
in each mode
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