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The fact that your keys hitting the screen created the problem, most likely the display itself is the failure and will have to be replaced. It is usually not cost effective to do so, because that part and the labor to replace it usually costs more than a new TV.
It sounds that there is some loose solder terminal inside the TVs' video output stage. Contact any service technician. Products powered by electricity should be
serviced or repaired only by experienced professional technicians. Any attempt
to service or repair the product by anyone else could result in serious injury
or death. If you are not familiar with electronics, do not
attempt to repair. Whether you suffer
fatal electrical shock. Instead, contact the nearest service centre.
Well if the "crack" looking stuff is horizontal or vertical like a bar, but at least in a straight line, you may have to replace a screen chip. Now if the "crack" looks like its not straight and looks sort of like a river, going this way then that, then the screen is unfortunately shot, something cracked it or hit the screen.... Find a used one to replace, or check your warranty and send it back. Other then that, may have to get a new one.
was the LCD pushed on or hit in anyway? Damage liek that is almost always irreversible. If you have a warranty for the LCD now's the time to use it. If you have any tech savy family or friends you can purchase laptop screens on auction sites fairly cheap($100-200), well as opposed to buying or paying the manufacturer (usually $500+) And do the repairs themselves.
If not then try a local repair shop as they will know best what to do.