Audio Output Is Small Or No Audio Output - LG OK99 Service Manual

7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT

Audio signal output is small or not. when you power on the Middle Power One-Body System.
7-1. AMP IC (IC700 ~ IC703)
7-1-1. Solution
Replace IC700 ~ IC703 on MAIN board.
7-1-2. How to troubleshoot (Countermeasure)
1) Please check if this system is on bass blast mode.
 FL/FR, SW1, SW2 make sound only on bass blast mode.
2) Check the IC700, IC701, IC702, IC703 on your eyes.
3) Check the audio signal output check (pin13 of IC700 ~ IC703).
First, check the PWM data input (pin3 of IC700 ~ IC703)
4) If the audio signal output has no output on the speaker, try to change IC which has no output.
5) Lastly, check speaker terminal (CN701).
7-1-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC701 IC701
IC700 IC700
< MAIN board top view >
3-16
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IC703 IC703
IC702 IC702
Only for training and service purposes.