Audio Abnormal - LG DM5420K Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

2. AUDIO ABNORMAL

Audio abnomal
Check the signal output
of L701, L702, L703, L704.
Check the signal output
of IC701 pin28, 31, 36, 39.
Check the signal input
IC701 pin6, 8,16,18.
Check IC701 VDD,
IC701 pin26,27,32,35,40,41 of
power circuit
Check the power circuit.
YES
NO
NO
YES
NO
YES
Check the speakers connection.
YES
Replace L701, L702, L703, L704.
NO
R708, R710, R711, R712 nomal?
Replace R708, R710, R711, R712.
YES
Check IC701 pin2, 4 voltage(3.3 V).
3-4
NO
NO
Replace IC701.