LG FH6 - Audio from Speaker

3-12
ONE POINT REPAIR GUIDE
3. NO AUDIO FROM SPEAKER
There is no sound output from speaker.
3-1. PWM IC/ AMP IC
3-1-1. Solution
Check IC701 (PWM IC) and IC702 (AMP IC) on MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Please check PWM_3V3 of IC701.
If 3.3 V is abnormal, check IC304.
2) Check pin20, 21, 22, 23, 24 of IC701.
If the signal doesn’t come out, check IC501.
3) If problem still occurs, check IC702 (AMP IC)
- Check PVDD voltage (40 V ~ 50 V) of IC702.
- Check AMP_12V of IC702.
- Check L701, L702, C720, C738 soldering status.
3-1-3. Service hint (Any picture/ Remark)
< MAIN board top view >
L701, L702
L701, L702
IC702
IC702
(TAS5631)
(TAS5631)
C720, C738
C720, C738
IC701
IC701
(TAS5548)
(TAS5548)