All the other buttons work just not the x make the indicator lights up with the other buttons just not the x
보통 조이콘 버튼을 누를때 다른 버튼으로 눌릴경우 쇼트일 가능성이 있습니다.
제 경험으론 R버튼이 쇼트트가 나면 그런 현상이 나타납니다.X버튼이 안눌릴경우는 보드에 버튼자리 테입을 뜯어 반대편으로 위치 변경을 하면 잘 눌러집니다.아님 카본을 제거하시면 잘 눌러 집니다.
Follow iFixit’s guide for the disassembly of the right joy con
titled:
/Guide/Nintendo+Switch+Right+Joy-Con+Buttons+Replacement/133803
The buttons themselves are dome switches that contact exposed traces on the PCB to ensure they aren’t dented or dirty and are properly aligned with the button and membrane.
Clean these peace sign shaped contact pads thoroughly with isopropyl alcohol and Q-tips or a microfiber cloth
you can toss the rubbery membranes, empty shells, and buttons into a dish of alcohol (1/3 of the volume) DISTILLED water and a drop of dish soap. Make sure to rinse with DISTILLED water or 90%+ isopropyl and use a microfiber cloth to mostly dry them and wipe off the residue, then set them out to dry for a good few hours.
You can buy a new set of metal dome caps for around $2. If you need new buttons or shell parts, OEM ones can be found from Mobilesentrix. In my independent testing, after-market custom parts from “JCD ALL Store” on Aliexpress have been the most impressive and closest to or better than the original plastic quality.
I hope this helps. 
if your problem persists after the deep cleaning described above, it’s probably software iFixit has an excellent software troubleshooting guide
-Daniel, Co-owner and CEO of Advanced Device Repair.