LG KT520 Service Manual page 136

B. EGSM Tx mode
ANTSW0
ANTSW1
ANTSW2
EGSM Tx
Logic OK?
Yes
See the Next mode
(DCS Tx Mode)
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Only for training and service purposes
EGSM Tx
MODE=0
SWTX=1,64,7
Low
Low
High
Figure 4-23. EGSM Tx Mode
No
4.17 part Check
OK?
Yes
ANTSW0:High
ANTSW1:Low
ANTSW2:High
WON : Low
Yes
Change U101
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4. TROUBLE SHOOTING
No
Try 4.17 part
No
Change the Board
LGE Internal Use Only