LG F1200 Service Manual page 83

4. TROUBLE SHOOTING
Checking Flow
Test for Mechanical
Connection
(No call setup is needed)
Check SW1 Pin 1, 2 with
RF Cable connected
Check SW1 Pin 1, 2 with
No RF Cable connected
Check ANT_SW1, ANT_SW2,
ANT_SW3
Check if Ant SW is set
as Tx mode.
Refer to ANT_SW Table
Check RF Level of FL100 Pin10
(for GSM), Pin8 (for DCS, PCS)
Check RF Level of FL100 Pin13
For this RF level test case,
Tx Stand alone mode
is needed
Open
Yes
Short
Yes
Check
ANT_SW1
ANT_SW2
ANT_SW3
Yes
Pin10 : ~ -33dBm
Pin8 :~-30dBm
Yes
EGSM : ~32dBm
DCS/PCS : ~29dBm
Yes
Mobile SW &FEM
is OK
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Repace SW1
No
Repace SW1
Redownload
The Phone Software
No
Replace U100
No
Check the parts are
well soldered
Replace FL100
No
Check the parts
are well solded