LG DP372 Service Manual page 20

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 &
1389DE/LP is
normally?
Check the cable
connection on front panel.
3-9
NO
YES
NO
YES
NO
YES
Check connection between
1389DE/LP & audio AMP.
Check the related
circuit of audio AMP.
Check communication
lines on 1389DE/LP.
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