You study (not just read) the guides and comments for the particular problem… in your case it sounds like loose clutches (Mac speak for hinges) have cut or nicked a cable or two (inverter - data display cable). The cables might be "fixable" with some silicone… or they may need rerouting and/or even replacement.
Just to ensure that it' not logic board or GPU/VGC related connect an external monitor… it should not lose its signal.
Obtain the proper tools - every job is easier when you use the proper tools.
Come back here and post comments or update your original question for more assistance.
If this answer is acceptable please remember to return and mark it.