There was an S video cable in the ALDI TV/computer pack. My laptop has an SVideo out port. I had 2 ways to connect to the TV, my TV had an S-video in port on the side, but the ALDI pack had a scart connector which took audio and S-Video. Using that, I could have hooked the audio from phono out on the laptop so I would get the laptop sound on the TV but as I mainly use it for music I ran that to a spare channel on the (bog standard) home cinema system to get surround sound. Again, the ALDI pack had a single phono to L/R for this.
After that just press the AV channel on the TV remote til you find the channel the laptop is coming in on.