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Electric spark sound in dell inspiron 3576

while watching video on my laptop for longer time, I hear  some electric spark sound from the speaker. and when I connect my laptop to T.V via hdmi cable then also sound comes from the T.V speaker. what would the fault in my laptop. Even Dell customer support isn't able to trace it. 

I even ran some hardware test by dell support application but it shows zero error.

 

kindly help 

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