Audio Output - LG LAP240 Service Manual

3. NO AUDIO OUTPUT
3-1. Solution
Check audio out trace step by step.
3-2. How to troubleshoot (Countermeasure)
1) If audio DSP, optical input trace, BT input trace signal is normal, check below procedure.
2) Check power. IC701 Pin3, IC700 Pin2, IC601 Pin3.
3) Normal power output conditions
4) Abnormal analog output conditions
5) After changing it, if the audio is still issued:
- Check line driver IC702, IC703, IC704's block.
- Check volume IC IC709's block.
- Check AMP IC IC706, IC707, IC708 block.
3-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
Check IC705 analog output Pin9, 10, 1, 2, 3, 4, 33, 34, 35, 36.
Try replacing IC705.
IC707
< Main board top view >
IC702
IC704
IC709
IC708
3-4
IC705
IC703
IC706