Dull Play button on CDJ 2000 Nexus

Hi,

I have two CDJ 2000 Nexus (first generation).

Two weeks ago on my CDJ 2000 Nexus n°1, the light play button didn't shined, it worked but it was dulled.

I decided to exchange the cards between my two CDJ to confirm the issue.

On my CDJ n°2 with the card from the Nexus n°1 the result was the same.

So I ordered a new card (DWX3339) and I put it in my CDJ n°2.

Today the issue come back on the CDJ n°1 (who has the card from the n°2). 

Do you think I have no chance and the card also failed or the issue is more deep ? Maybe the mother card ?

Thanks

Sébastien