LG -600 Series Repair Manual page 85

Gsm phone
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Appendix.
RECEIVE Flow Chart & Solution
14-A) Check Placement of  RECEIVER
14-B) Check F605, F606 Using Osciolloscope
Yes
Signal Detect ? 
Goto Block 15!
GSM Handsets Lab.
No
85
Check Soldering
F605, F606 
 14-B) Test!!
Yes
Replace
U501
Reference  RECEIVER Signal

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