Chosen Solution

Hello, I’d like to fix my new 3ds xl. The top screen is ok, but the lower screen is not. The elements are somewhat pale, it is really bright. Also I can’t regulate the Sound anymore, how to fix this, any suggestions? I just opened it but I don’t see anything wrong so far. Google didn’t really helped me tho.

Replace the speaker/slider ribbon, check if the screen looks good after cleaning the contacts, check if pins are broken or bent, check if the latch is broken off. If after all the troubleshooting nothing helped replace the lower lcd