LG DP270B Service Manual page 24

MAIN ELECTRICAL TROUBLESHOOTING GUIDE
E
YES
Normal
Audio output when
disc playback.
YES
Normal
IR. VFD & Front pannel
key functions.
YES
TEST END
Proper
NO
Aout_L, Aout_R signal
on MTK1389
Check Audio filter, amplify,
mute circuit.
Commu-
nications between
NO
IR.VFD Front pannel key &
MT1389 & Front µ-com
is normally.
NO
Check the cable connection
on Front pannel.
3-17
NO
NO
YES
NO
YES
Check Aout_L related circuit
Aout_R
Check the related circuit of
Audio DAC.
Check communi cation lines
on MT1389