Replacement hinges
https://www.amazon.co.uk/DBTLAP-Acer-Travelmate-7520-7520G/dp/B079JGBB78
Often laptops with stiff hinges rip the threaded inserts out of the lid so there will be nothing to screw the hinges to.
If this is the case, you may be able to glue or araldite the inserts back in.
I...