LG GT500 Service Manual page 137

4. TROUBLE SHOOTING
C. GSM850/EGSM Tx mode
ANTSW0/1
ANTSW2
ANTSW3
GSM850/EGSM Tx
Logic OK?
See the Next mode
(DCS Rx Mode)
LGE Internal Use Only
GSM850/EGSM Tx
MODE=3
SWTX=190,64,7
Low
Low
High
Figure 4-23.GSM850/EGSM Tx Mode
No
Yes
ANTSW0/1:Low
- 138 -
No
4.17 part Check
OK?
Yes
No
ANTSW2:Low
ANTSW3:High
WON : Low
Yes
Change U101
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Try 4.17 part
Change the Board
Only for training and service purposes