Scan lines and distorted lower screen
My lower Nintendo DS screen was blank, but the backlight was on and the touch panel works, so I replaced the display to no avail. I then tried turning the lower screen’s potentiometer to adjust the contrast and was able to get some display, but it’s only a partial display and some scan lines show up. I tried this with the replacement lower screen as well, but I got a checkered/plaid red/green line pattern.
Are the screens toast? Should I try replacing the pot?
EDIT: various pictures of the motherboard.
Zoom-in on reverse side of board. Maybe C14 looks worse for wear, and there's some corrosion between C15/GSP1: