Reasons: If it still doesn't work,
1. maybe your internet module is broken.
2. maybe a capacitor is broken (use a multimeter to check if it is broken), but it requires soldering to remove, so I wouldn't recommend if you don't have experience soldering.
3. maybe one of your screens ribbon cable is scratched or torn, which means that your screen won't work and is broken. If your screens ribbon cable is dirty, clean it with isopropyl alcohol and a Q-tip, like in the video.
You can buy replacement piece on amazon or aliexpress
Thanks for watching, I got lucky with this ds lite, because it only had a disconnected ribbon cable. Sorry for the bad video quality.