Valentinsdag Melik, No, unfortunately you can’t just use any LED strips, because they’re not designed for your backlight driver circuitry. If you go on eBay there’s a plethora of backlight kits for the Insignia. Just search for “insignia tv backlight strips”. Even better if you include the exact model number of your TV to narrow down the search.
***Note***! Don’t go for the first and cheapest. Do some research, read feedback and it’s good to check how many the seller has sold already. Higher sold numbers alongside high positive feedback is a good sign.