How do I repair a cracked LED screen on my Nikon D-80.

cheaper to get a new one.
screens doesnt repair, they have to be change and the cost of LCD panels are normally 60-80% of the tv, sometimes way higher

You can likely get a new screen there usually around £80 upwards there maybe a link on you- tube telling you how to replace it depends on how good you are with doing your own repairs of take it in for repair though with the cost and labour it may be worth just investing in a new machine or you could plug it in to an external monitor or a TV with a VGA or HDMI connection.

Will be best to buy a new TV, other than trying to replace the cracked screen, as it will cost around 80% of the total cost of a new TV, including panel price and service charge.

You may order a replacement from http://uscamera.com/1s268-090.htm. Given the price, and unless you're experienced at electronics repair, you might want to consider getting a new camera.

I suspect that you either dropped your camera or subjected it to mechanical shock. From what you describe, this is more then a cracked LCD and it needs to go in for repair.

Ok,
It is highly complicated. Please let the tecnicians do that. May be it will be dangerous for the fine tunes of camera. May be the below diagram can give a bit..
Do not do it yourself please.

Here it is: http://www.ownta.com/nikon-coolpix-s550-digital-camera-repairing-lcd-screen-for-replacement.html

Google the words...disassemble a digital camera.

If you can source a replacement screen then it's usually a straightforward repair, but it's completely uneconomical to do even on a DIY basis.

Your camera sold new for £70 in the UK in 2007, a replacement screen including shipping is going to cost more than you could buy a complete, pristine, working, used L10 for.

It is not something you can do yourself. Please send to an authorized repair centre.