I don't know about an LLC, but under my S Corp, I can do whatever I want. I can work my handyman trade, or I practice my computer repair business, or I can do computer help and training, or anything else I want to do as income. If you decide you don't want to use the LLC for e-scrap business, you and use it for a repair and training business... Just don't name the LLC something on the order of "Complete Computer Destruction as Well as the Annihilation of all Usable Data LLC" or you may have trouble attracting repair business.