LG -600 Series Repair Manual page 58

Appendix.
Rx Flow Chart & Solution
3-A) Check Placement of U212
3-B) Check Pin 4. Using Oscilloscope.
3-C) Check Pin 3. Using Oscilloscope.
13MHz Output ?
Yes
U212 Working
Goto Block 4
GSM Handsets Lab.
Yes No
Voltage 2.7V ?
No
Pin 1. High ?
Yes
13MHz Line Short?
No
Q200 Working?
No
Yes
U211 Pin 5. 2.7 V?
No
No
AFC Line Short?
No
Yes
Yes
58
Check Short
3-B) Test!!
Replace U211
Yes
Replace U501
Check Short
3-C) Test!!
Replace U212
3-C) Test!!
Replace Q200
3-C) Test!!