Y axis not working on 3ds

Hello there! First time poster. So, about a few weeks ago I got my hands on a used 3ds xl. However, the Y axis on the circle pad didn't seem to work at all. Intially, I thought it must be a faulty circle pad, but even after replacing it the problem's still there. Next, I tried directly soldering the contacts to the 3ds board. Still no luck. So is there any alternate point I can solder the y axis pin to?
 
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