LG L240 Service Manual page 75

4. TROUBLE SHOOTING
Check the SPK_EN( R333)
Check the input(R330,R332) of U303
The signal is a Analog
<Fig.2> INPUT(R330) of U303
1
Is SPK_EN a High?
YES
Play the Ring tone.
YES
U303 is broken.
Replace the U303.
- 76 -
NO
U102(DBB) is broken.
Change the board.
NO
2
<Fig.3> OUTPUT(C341)of U303