LG GS290 - Page 99

- 100 -
LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics 100/136 LGE Property
Check
T
P1 of SW500
with RF Cable and TP2 of C524
T
P1 Signal same
as TP2
?
Replace Mobile SW (SW500)
Yes
No
Yes
Mobile SW & FEM is OK.
Check Antenna.
Replace BB CHIP (U100)
Control Signal is
OK
?
No
Yes
Check
T
P3, TP4 of FL500 ?
Replace FEM (FL500)
T
P5 Signal is O
K
?
No
Yes
Checking Flow
EG
S
M TX
Figure 30 Mobile SW (R403)
Figure 31 FEM Control Signals
TP3
(
VC2
)
TP4
(
VC1
)