LG KM710 Service Manual page 48

4.2.1.3 Mobile Switch & PAM & FEM Circuit
Mobile Switch
SW400 between C413 and
C421 Is short?
YES
FEM
Check Control Signal
C422, C424
YES
Check FL400
RX
<GSM850>
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Only for training and service purposes
NO
Replace SW400
NO
Check U401,U402
LB_HB
TX_ANT_SW_EN
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4. Trouble Shooting
C424
C422
C421
SW400
C413
RX
RX
<PCS1900>
LGE Internal Use Only