Just read from Siliconera:
Nintendo announced that it will end repair services for the Wii console in Japan on March 31, 2020.
Nintendo will no longer accept Wii consoles for repair after the end of March. The reason for this is due to their shortage of repair components for the console. This applies to the Wii console [RVL-001], including all colors.
There may be cases before its end of service date where repairs won’t be possible due to the lack of certain components. Nintendo apologizes for any inconvenience and asks for your understanding on the matter.

Nintendo announced that it will end repair services for the Wii console in Japan on March 31, 2020.
Nintendo will no longer accept Wii consoles for repair after the end of March. The reason for this is due to their shortage of repair components for the console. This applies to the Wii console [RVL-001], including all colors.
There may be cases before its end of service date where repairs won’t be possible due to the lack of certain components. Nintendo apologizes for any inconvenience and asks for your understanding on the matter.