Old 3ds lower screen issue

[Ha2eee]

I recently bought a 3ds with all the data wiped off it and I had to buy a new motherboard. I replaced it and the lower screen just doesn't work right, it lights up, it reacts to touches but It doesn't show anything. So I don't know if it is the ribbon issue or the screen and I don't know if the screen worked on the previous motherboard cause the console wasn't starting at all.
There are pictures of the whole motherboard and of lower screen ribbons I think