When I open/close my macbook, i hear some crackling/clicking. Is it serious?

There is internal damage. 👈🏼

Get expert service and support at the Genius Bar.

👉🏼 Call 1-800-MY-APPLE or get help here. 

Arseniy73 Said:

"Crackling: When I open/close my macbook, i hear some crackling/clicking. Is it serious?"

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Troubleshooting Mac Volume:

Two Things:

A. Try Reseting the Core Audio:

Type the following command in Terminal:

sudo killall coreaudiod

B. Perform a SMC and NVRAM Reset:

(Applies to Intel Macs only)Sometimes changes are made to the system(i.e. updates) and then settings (i.e. for Power) become manipulated, technically.  So, reset both the SMC and NVRAM on your Mac.

Arseniy73 Said:

"Crackling: When I open/close my macbook, i hear some crackling/clicking. Is it serious?"

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See this Post's Answer: iMac making a crackling or ticking sound - Apple Community

It is a much older post(2009), yet it reports that replacing the fan and hard drive fixed this.

From your description, it has been damaged. 👈🏼