LG KE520 Service Manual page 93

4. TROUBLE SHOOTING
Check the SPK_EN( R203)
Check the AMP_EN( R107)
Check the input(C211,C213) of U201
U201 is broken.
Replace the U201.
<Fig.1> INPUT(C211) of U201
LGE Internal Use Only
1
Is SPK_EN a High?
YES
Is AMP_EN a High?
YES
Play the Ring tone.
The signal is a Analog
YES
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NO U103(DBB) is broken.
Change the board.
NO
U103(DBB) is broken.
Change the board.
NO
2
<Fig.2> OUTPUT(C219)of U201
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