LG -600 Series Repair Manual page 77

Appendix.
Tx Flow Chart & Solution
11-A) Check Placement of U103
11-B) Check U107(Mobile Switch) Pin 1,2 (S/W Signal Line) Using Spectrum Analyzer
Yes
11-C) Check U103 Pin 2, Using Spectrum Analyzer.
Yes
TX Path Working !
GSM Handsets Lab.
RF Output ?
RF Output ~ 15dbm ?
No
No
77
Check Soldering
Replace U107
11-B) Test!!
Replace U103
11-C) Test!!