After reshelling my 3ds, everything worked fine. I booted it up and the speakers were at max and the 3d slider was at full depth. I tried moving the sliders but I wasn't getting any response. I reopened my 3ds and reseat all the ribbon cables connected to the sliders but it still wouldn't change...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi