LG CM9530 - Audio Output Is Small or no Audio Output

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ONE POINT REPAIR GUIDE
7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT
Audio signal output is small or not. when you power on the Middle Power Mini
System.
7-1. IC700 ~ IC705
7-1-1. Solution
Please check and replace IC700 ~ IC705 on MAIN board.
7-1-2. How to troubleshoot (Countermeasure)
1) Please check if this system is on bass blast mode.
 C, RL and RR make sound only on bass blast mode.
2) Check the IC700 ~ IC705 on your eyes.
3) Check the audio signal output check (Pin13 of IC700 ~ IC705).
First, check the Audio Data input (Pin3 pin of IC700 ~ IC705).
4) If the audio signal output has no output, try to change IC which has no output.
5) Lastly, check Speaker Terminal (TM700).
7-1-3. Service hint (Any picture / Remark)
< MAIN board top view >