LG DK867 Service Manual page 24

ELECTRICAL TROUBLESHOOTING GUIDE
E
Normal
Audio output when disc
playback?
YES
Normal
IR.VFD & Front
panel key
functions?
YES
TEST END
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Only for training and service purposes
Audio
NO
AMP received correct
data stream?
Normal
Audio AMP out?
Check Audio filter,
amplify, mute circuit.
Commu-
nications between
NO
IR.VFD Front panel key
& MT1389Lis
normally?
Check the cable connection
on Front panel.
3-11
NO
YES
NO
YES
NO
YES
Check connection between
MT1389L & Audio AMP.
Check the related
circuit of Audio AMP.
Check communication
lines on MT1389L.
LGE Internal Use Only