No Speaker Output - LG BH5140S Service Manual

5. NO SPEAKER OUTPUT

When unit is connected to Speaker using speaker cable, no speaker output.
5-1. AMP BOARD
5-1-1. Solution
Replace AMP board.
5-1-2. How to troubleshoot (Countermeasure)
1) Check voltage at CN601.
- If 36 V,14 VA, 3.8 VA voltage doesn't come out, re-soldering pin CN601.
2) Check voltage at IC700, IC701, IC702.
- If 36 V, 12 V voltage doesn't come out, check IC600 and SMPS board.
3) Check the AMP_SD signal of pin22 at CN600.
- If this pin is low, replace IC700, IC701, IC702.
4) If problem still occurs, replace AMP board.
5-1-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
AMP_SD (pin22)
< AMP board top view >
CN600
2-40
12 V
IC600
CN601
36 V
14 VA
3.8 VA