LG KE590 Service Manual page 51

4. TROUBLE SHOOTING
4.2.1.3 Mobile Switch & PAM & FEM Circuit
C418
U404
R408
C426
C423
GSM900
LGE Internal Use Only
C415
FL401
C420
U403
VC_EGSM/DCS_TX
(C418/C420)
TX_BAND(R418)
TX_ON(C421)
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Check SW401
(Mobile switch)
OK
NO
Check R415, R416
(With spectrum analyzer)
OK
NO
Check C415
(With spectrum analyzer)
OK
Check Control Signal
C418,C420,C423,C426
OK
Re-download SW & CAL
DCS
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Only for training and service purposes
NO
Replace
SW401
Check
U404
Check
FL401
NO
Check U403