Hi and welcome to Just Answer. I am sorry to hear about your TV.
Can I get the full model number?
How is the picture?
If the actual LCD panel is cracked, there is no way to repair. You would have to replace the panel itself. This is usually cost prohibitive. The panel for your TV is $2529.00. Remember to add shipping and installation.
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It is unlikely that there was a defect in the TV. Cracked panels are usually caused by three things:
Damage during shipping or transportation.
Damage caused by flexing of the chassis during handling or mounting of the TV.
Damage caused by flying Wii controllers, toy cars, etc.
That's it. One of those three things happened.