Question Why is my laptop making strange hissing noises ?

Dec 17, 2020
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hi everyone
so i got a lenvo ideapad L340 gaming laptop and its making strange hissing noise(like electric sparks XD) along with the charger for over a year and lately i could hear some popping noise, its only audible in a quiet room though, anyway so since it was in warranty i got it back to them, they insisted it was normal, until they diagnosed it, they said it was a bad adapter and something with the battery (they didnt specify nor gave me a full report yet), anyway they returned my laptop until they get the parts cause i have work to do on it, but i'm worried and i want to know what could be the cause, and no-one is giving any help yet?

googling it was also useless and all i could find is speakers or fan problems which isnt the case.
any help is appreciated. the more detailed the better.

p.s: its slow as a snail too but works just fine when running games or cad (computer-aided design and drafting) programs.
 
You had it checked on and they said why it was happening, so you know the cause. If you want to know why it happened, electronics fail. Sometimes no way to know why, parts get stressed with the heat and current going through them. A lot of small parts to fail.