LG KM710 Service Manual - Page 48
Mobile Switch & PAM & FEM Circuit
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4. Trouble Shooting 4.2.1.3 Mobile Switch & PAM & FEM Circuit Mobile Switch SW400 between C413 and NO C421 Is short? YES FEM Replace SW400 Check Control Signal C422, C424 YES Check FL400 NO Check U401,U402 C424 C422 C421 SW400 C413 RX RX RX LB_HB TX_ANT_SW_EN Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 49 - LGE Internal Use Only
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- 49 -
4. Trouble Shooting
4.2.1.3 Mobile Switch & PAM & FEM Circuit
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
Check FL
400
FEM
Check Control Signal
C422, C4
24
Mobile Switc
h
SW400 between C413 and
C421 Is short
?
Re
place SW400
Check U401,U
402
YES
YES
NO
NO
C413
C421
C422
C424
SW400
RX
RX
LB_HB
TX_ANT_SW_EN
RX
<GSM850>
<PCS1900>