I think probably the hinge itself is good but it is rather what it is attached to that is the problem.
You may need to disassemble the laptop depending if the problem is on the top or lower case.
This one is a possible solution if the problem is on the screen assembly. It also explains removing the bezel around the screen:
If the problem is on the main body of the computer watch below.
Here is how to open the bottom cover:
Note: This video shows the hinges but not how to fix or replace.
This shows how to seperate the hinges from top body of case at about 14 minutes into the video:
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