Yamaha rx-v3900 dac problem


Novice Member
The past few days all inputs (optical and hdmi), even net radio, in straight mode or 2 ch stereo or pure direct mode sound is emmited by only one channel, and more specifically the front left. When I set it to other DSP modes like 7 ch stereo, play all channels. I think that the problem is in DAC.
Is there any way to check it before I take the amplifier to service ?

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