Do I need new hinges? Perhaps are they:
Cracked? A cracked pair of hinges cannot be repaired and will need to be replaced
Loose / not holding up the screen? A loose display or a lcd screen that does not stay up is in most cases the result of faulty laptop hinges but can also sometimes be caused by a broken lcd hinge bracket and not the hinges themselves so please make sure that it is the hinges that need replacement and not the hinge brackets.
Laptop hinges are generally made of low-cost metal alloys, or "pot metal." Pot metal is not particularly durable, and over the course of a laptop's life cycle, repeated opening and closing of the laptop's lid can cause wear that prevents the lid from staying in an open position. Hinges can also wear to the point that they break at the point of attachment, either on the lid or the laptop's body.
Hinges are usually attached to the laptop's frame via machine screws. In order to get the most life out of your laptop's hinges, it is not a bad idea to perform a yearly inspection. Remove the hinge covers and check that the machine screws that secure the hinges are tightened fully. If screws are missing, contact the laptop's manufacturer to order replacement screws; hinges missing screws are subjected to additional stress and can wear out faster if steps are not taken to replace the screw.
Lubrication of the hinge is possible, but not recommended; if the wrong type of lubricant is used, it could damage the laptop's case or seep into the electrical components and further damage the laptop. Consult a professional technician if you feel that your hinges require lubrication.
Hinges can also be damaged when the laptop is picked up by its lid, dropped from various heights or opened beyond the angle at which it should stop. In these situations, damage to the hinges may be of secondary concern, as component damage and data loss might have occurred. Depending on the amount of damage and warranty status, the laptop may require complete replacement.