LG NB3532A Service Manual page 19

RECEIVER BAR ONE POINT REPAIR GUIDE
1-4. NO AUDIO
1-4-1. All function
1-4-1-1. Solution
Replace IC301 or IC701.
1-4-1-2. How to troubleshoot (Countermeasure)
1) Please check IC301(Pin71, 74 and 69, 70) or IC701(Pin5, 6 and 14, 15).
PWM signal output (or input)
2) If you cannot find PWM signal, replace IC301.
If you can find signal PWM, replace IC701.
1-4-1-3. Service hint (Any picture / Remark)
IC301
< MAIN board top view >
< MAIN board bottom view >
3-6
IC701