To adapt the Govee TV Backlight (Multicolour, 360 cm, Indoor) to a 30 inch screen, there are a few things to consider, as the manual does not contain specific instructions on how to cut the strips.

- Shortening the LED strips: The Govee TV Backlight LED strips are marked in specific sections where they can be safely shortened. These sections are usually marked and should be mentioned in the product or in the accompanying materials, even if it is not explicitly described in the manual.
- Joints and connections: Make sure that you only cut the strips at the marked interfaces so as not to damage the electrical connections.
- Electrical safety: Make sure that the shortened ends are properly insulated to avoid short circuits.

If you are unsure, I recommend contacting Govee's customer service directly or looking for further instructions on the manufacturer's official website, as shortening the product incorrectly can lead to damage.