LG KE800 Service Manual page 68

Checking Flow
Check Pin 1, 2 of SW501
Check Pin 20, 21, 22 of
Mobile SW & FEM is OK.
See next page to check I/Q
Figure 11. Mobile SW
with RF Cable
Signal is OK ?
Yes
FL501
Yes
Control Signal is
OK ?
Yes
Pin 16, 17 or 14, 15
Signal is normal ?
Yes
Signals.
- 69 -
No
Replace Mobile SW
(SW501)
No
Check PMB8876 (U103)
No
Replace FEM (FL501)
EGSM RX
Figure 12. FEM Control Signals
4. Trouble Shooting
ANT_SW1
ANT_SW2
ANT_SW3