The eMac was an all-in-one G4-based Mac designed for the education market and released in April 2002. It was the last Mac to use a CRT display and was sold at a low price to schools and other institutions.
I have an emac and I want to know the names of the diferent components and how to replace it.
Here is a link to a guide for replacing the optical drive. I believe it will take to where you can replace the logic board. Be VERY careful around the CRT and good luck.
Also here is a link to the iFixit guides.
Go here and select your eMac. It will show you all the parts and part numbers: http://www.welovemacs.com/emsepa.html