If you are going to have a go at repairing your own PS2, it will help a great deal to know which version you have.

As a basic start, count how many screw covers there are on your console underside, there will be either 8 or 10 screw covers.  Please refer to the posts below to determin which version console you have.

PS2 with 8 screw covers (left) and PS2 with 10 screw covers (right)