LG MG180C Service Manual page 82

4.15.6 Checking FEM & Mobile SW (1) (Tx pass continued)
Check RF Level FL500 Pin 10,12
Check ANT_S W1, ANT_SW2 of FL500
ANT_SW1=Low & ANT_SW2=High or
ANT_SW1=High & ANT_SW2=High ?
Check S W500 Pin 1,2 wi th
no RF cabl e connected
Check S W500 Pin 1,2 wi th
FEM & Mobile SW is OK.
20dBm
Yes
Yes
Check FL50 0 Pin 17
20dBm
Yes
Short ?
Yes
RF cabl e connected
Open ?
Yes
Change t he board
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4. TROUBLE SHOOTING
Tx st andalone m ode is needed
(Tabl e 2-1)
No
Repl ace U501
No
Repl ace
the board
No
Repl ace
FL500
No
Repl ace
SW500
No
Repl ace
SW500