Hi Winston!
This could be caused by a lot of things! First the easy steps!
Did you replace the AV cable? If not, I would try this first and see if that works!
If not, please try a different TV, just to be sure if that will work or not.
If that also fails, then please share some pictures with us regarding the AV connector, so we can check if that one is still good or not.
If you have anything else, please let us know!