LG PRADA KE850 - Page 112

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
Mobile SW & FEM is OK.
Check Antenna.
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
EGSM TX
ANT SW
ANT SW2
ANT SW
Figure 32 Mobile SW Figure 33 FEM Control Signals