LG PRADA KE850 - Page 102

5. Trouble shooting
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Checking Flow
Check Pin 1, 2 of SW40
with RF Cable
1
Signal is OK ?
Replace Mobile SW
(SW401)
Yes
No
Yes
Check PMB8876 (U101)
Control Signal is
No
Yes
Check Pin 20, 21, 22 of
U401?
OK?
Replace FEM (U401)
Pin 16, 17 or 14, 15
No
Yes
Mobile SW & FEM is OK.
See next page to check I/Q
Signals.
Figure 12 Mobile SW Figure 13 FEM Control Signals
EGSM RX
ANT SW1
ANT SW2
ANT SW3