LG GD580 Service Manual page 135

4. Trouble Shooting
A. EGSM Rx mode
ANTSW1
ANTSW2
ANTSW3
EGSM Rx
Logic OK?
See the Next mode
(EGSM Tx Mode)
LGE Internal Use Only
MODE=0
SWRX=49,3
High
Low
High
Figure 4-17. EGSM Rx Mode
No
Yes
Change the Board
EGSM Rx
No
4.17 part Check
OK?
Yes
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Try 4.17 part
Only for training and service purposes