LG DP122 Service Manual page 33

ELECTRICAL TROUBLESHOOTING GUIDE
E
Normal
Audio output when
disc playback?
YES
Is the Remocon
function?
YES
TEST END
Audio
NO
AMP received correct
data stream?
Normal
Audio AMP out?
Check Audio filter,
amplify, mute circuit.
NO
Is the IR signal and level
to Mpeg is normally?
Check connection IR from
SMPS board to Main board
3-18
NO
YES
NO
YES
NO
YES
Check connection between
MPEG and Audio AMP
Check the related
circuit of Audio AMP.
Check 12V power supply
from SMPS board
Replace Remocon receiver
RC901