LG FLATRON L2320A - SOUND TROBLE SHOOTING

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Copyright 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. SOUND TROBLE SHOOTING
NO SOUND OUTPUT
Check the
Line out Jack
or Speaker
Check the output of U3
.U3 Pin#24, 25, 27, 28
Replace the U3
(MSP3420G)
Check Connector
*AV B’d: J704
*Soun B’d: J2
Pass
Check Power Line
*U7 output(8V)
*5VA
Check
the sound output when
any sound source input
.C3(-), C4(-),
C12(-), C13(-)
Pass
Check Reset signal
for U3(Pin#21)
Pass
Check the
Oscillator(X3)
Pass
Pass
Replace the
Component of
Buffer circuit
Pass
Fail
Fail