The first thing you need to do is to disconnect all the speakers.
Then connect them one at a time and see if you get the correct volume on any of them.
If you don't get the correct volume on some of the speakers then it's those speakers that are faulty.
If you don't get the correct volume on any of the speakers then the fault is with the internal amplifier and you'd need to take it to get it repaired.
There is some conflict with one speaker or tow try to test them one by one till you got the bad one
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I tried already but not the speaker it the problem ! Like i sad at 0 db volume the volume it's too low and when i adjust the volume i hear in the speker little knoking , and from -18db volume and lower the sound remain at the same level untill -90db ! All the rest function it's ok ! I suspect the main processor IC401 but it's hard to think just the volume control part from the IC could be broken ! Thanks !
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