LG F1200 Service Manual page 71

4. TROUBLE SHOOTING
Checking Flow
Test for Mechanical
(No call setup is needed)
For this RF level test case,
Rx Stand alone mode
is needed
Connection
Check SW1 Pin 1,2 with
RF Cable connected
Check SW100 Pin 1,2 with
No RF Cable connected
Check C111, C112, C127
Check if Ant SW is set
as Rx mode
Check RF Level of Mobile
SW output
For All band : SW100 Pin2
Check RF Level of FEM Output
For EGSM : FL100.1
For DCS : FL100.3
For PCS : FL100.5
On the just one line of the
two balanced Signal Lines
Open
Yes
Short
Yes
ANT_SW1 : Low
ANT_SW2 : Low
ANT_SW3 : Low
Yes
Pin2 : ~ -60dBm
Yes
Pin1 : ~ -67dBm
Pin3 : ~ -67dBm
Pin5 : ~ -67dBm
Yes
FEM is OK
Go to the next stage
- 70 -
Replace SW1
No
Replace SW1
No
Redownload
Phone Software
No
Replace SW1
No
Check the parts are
Well soldered
Change FL100
No
Check the parts
are well solded