OYN-X HDA - 8. There is no audio signal in the surveillance window.; 9. There is audio signal in the surveillance window but no audio signal in the playback state.

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C. The data line of the hard disk is damaged.
D. The hard disk is damaged.
E. The hardware of the DVR is damaged.
8. There is no audio signal in the surveillance window.
Possible reasons:
A. It does not have an active tone arm.
B. It does not have an active sound box.
C. The audio lines are damaged.
D. The hardware of the DVR is damaged.
9. There is audio signal in the surveillance window but no audio signal in the
playback state.
Possible reasons:
A. Setting issues: the audio option is not chosen.
B. The according channel is not connected with the video.
10. The time is wrong.
Possible reasons:
A. Setting is wrong..
B. The battery has a bad connection or the voltage is too low.
C. The oscillation is damaged.