your best bet is to open the TV and see what has come loose. if you lucky it is either a metal casing soldered to the PCB or a plastic casing thats broken. If this is the case and you are capable you can solder it back onto the board or glue plastic casing. Just take care that you dont induce any static into the board as you could blow some of the LSI chips on the board. then reverse the order you took it apart. Best if you strip, take a photo every step of the way so you dont end up with spares once you have closed up again. Good Luck
See if you can down load the service manual for the TV or find the Board type on the PCB somewhere. Note you some large scale ICs that do signal conversion before it gets to main processor and there are a fair amount of surface mount components on the board. Depending on your capability you might be able to change these components, but it might be les hassle buying a replacement PCB on eBay or the likes as replacing components if you're not careful static might do more damage than good.