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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
Check Audio filter, amplify,
mute circuit.
Check Aout_L related circuit
Aout_R
NO
Normal
Audio output when
disc playback.
Proper
Aout_L, Aout_R signal
on MTK1389
NO
Check the related circuit of
Audio DAC.
NO
YES
YES
Check communi cation lines
on MT1389
NO
Normal
IR. VFD & Front pannel
key functions.
Commu-
nications between
IR.VFD Front pannel key &
MT1389 & Front µ-com
is normally.
NO
NO
YES
Check the cable connection
on Front pannel.
TEST END
YES
B
YES