LG GX500 - Page 107

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Only for training and service purposes
4. TROUBLE SHOOTING
GX500 Operational Description Revision A
LG Electronics 108/143 LGE Property
Check
T
P1 of SW600
with RF Cable and TP2 of
C418/C616
T
P1 Signal same
as TP2
?
Replace Mobile SW
(SW401/SW602)
Yes
No
Yes
Mobile SW & FEM is OK.
Check Antenna.
Replace BB CHIP
(U101/U502)
Control Signal is
O
K
?
No
Check
T
P3, TP4 of FL401/FL1 ?
Replace FEM (FL401/FL1)
T
P5 Signal is O
K
?
No
Yes
Checking Flow
EGSM TX
Yes
Fi
g
ure 4-60 FEM Control Si
g
nals Fi
g
ure 4-59 Mobile SW
(
R403
)