LG -600 Series Repair Manual page 54

Appendix.
Rx Flow Chart & Solution
Block 2 Test-1) U207 (RF 2.85V LDO) Check!!
2-A) Check Pin 1. Using Oscilloscope
2-B) Check Pin 3. Using Oscilloscope
2-C) Check Pin 5. Using Oscilloscope
GSM Handsets Lab.
Yes
Voltage 4.2V ?
Yes
Pin 3. High ?
Yes
RF2V8 O.K?
U207 Working
Goto Block 3 !!
Check Placement of U207
No
VBAT Line Check Short? (Using Multi Meter)
No
Check U903
Goto Next Page
No
Check Placement of U207
Check RF2.85V Line. Short?(Using Multi Meter)
54
If it has not problem
Replace U207
2-B Test!!
If it has not problem