It seems you're experiencing an issue with your Nintendo DS Lite's lower screen. Let's troubleshoot this glitchy display! While I'm not a certified technician, I can offer some insights based on common problems:
1. **Bad Connection**:
- A **loose or faulty connection** between the screen and the motherboard could cause display issues.
- Check if the **ribbon cable** connecting the lower screen is securely attached. Ensure it's in a straight line and properly seated.
- If you've recently replaced any parts, consider trying the **old bottom screen** to see if the issue persists.
2. **Faulty LCD Screen**:
- The **discolored and glitched display** might indicate a problem with the **LCD screen** itself.
- Sometimes, a **defective new screen** can cause issues. If you have the old screen, test it to rule out this possibility.
- If the problem persists, consider replacing the **bottom LCD screen**.
Remember that these are general suggestions, and for a precise diagnosis, it's best to consult a professional technician or refer to official repair guides.