On the 23rd February I asked you to try plugging in a set of headphone.
Only now have you done so but you may be getting somewhere.
Connect up a HDMI cable from your laptop to your TV, with both powered down, turn them both on and see if sound from the laptop is coming out of the TV. If not, go into settings and then sounds where there should be both laptop speakers and the make of your TV showing in the Output section. Select TV and try again.
Report back on what you find