Audio Output - LG DP122 Service Manual

3. NO AUDIO OUTPUT
When you plug power cord and turn the unit on, LED will turn on, the unit will read disc normally,
but it won't have audio output.
3-1. Please check the solder joint status of MAIN board connector JK701.
If JK701 has cold solder joint, JK701 pins should be oxidized, and please replace JK701.
3-2. Please check the working status of MAIN board IC702.
If output voltage 12 V on IC702 pin8 is not normal, please check 12 V power circuit of MAIN board.
If AL and AR signal from IC702 pin1, 2, 6, 7 is not normally output, please check if IC702 is in failure.
3-3. Please check the working status of MAIN board IC601.
If AL and AR signal from IC601 pin116, pin118 is not normally output, please check if IC601 is in failure.
JK701
(AV JACK)
IC702
(AUDIO)
ONE POINT REPAIR GUIDE
< MAIN board top view >
3-8
IC601
(MPEG)