LG KE820 Service Manual page 102

Checking Flow
Check Pin 1, 2 of SW401
Check Pin 20, 21, 22 of
Mobile SW & FEM is OK.
See next page to check I/Q
Figure 12 Mobile SW
with RF Cable
Signal is OK?
Yes
FL308?
Yes
Control Signal is
OK?
Yes
Pin 16, 17 or 14,
15
Yes
Signals
- 103 -
No
Replace Mobile SW
(SW401)
No
Check PMB8876 (U102)
No
Replace FEM (FL308)
EGSM RX
Figure 13 FEM Control Signals
5. Trouble shooting
ANT SW
ANT SW2
ANT SW