七彩虹b250m-k，后置无音频输出

七彩虹b250m-k，后置无音频输出

hdmi模式音频线插显示器上有声音，后置无声音，任何模式下都没有。判断音频芯片坏。之前更换音频芯片，几个版本的都试过了不行，找了份类似的图纸，没解决。
就这么几个地方，咋就是没搞定呢

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