LG KG330 Service Manual page 79

4. TROUBLE SHOOTING
For these 2 test case,
No Call connection is needed
Check CN400 Pin ANT,RF
with RF Cable connected.
Check CN401 Pin ANT,RF
with No RF Cable Connected
Check R421,R422
Check if ANT_SW is set as
RX mode
Check RF Level of Mobile
S/W output:
For all band CN400 Pin RF
Check RF Level of FEM output
FL400.1 (for GSM)
FL400.3 (for DCS)
FL400.5 (for PCS)
For this RF Level test case,
RX Stand alone Mode is needed
Open
Yes
Short
Yes
EGSM=>
sw1:low/sw2:low
DCS,PCS=>
sw1:high/sw2:low
Yes
Pin RF:~-60dBm
Yes
Pin1 : ~ -67dBm
Pin3 : ~ -67dBm
Pin5 : ~ -67dBm
Yes
FEM & Mobile SW is OK
See next Page to check
Rx IQ Signal
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No
Change CN400
No
Change CN400
No
Change the Board.
No
Change CN400
No
Change FL400