Here are your parts
Parts for LFC25776ST - AppliancePartsPros.com

Below is a manual although it is not for your unit it will at least give you an idea of how LG does things.
You will have to joinn the site and be logged in to be able to download the manual.
http://appliancejunk.com...wnloads;sa=view;down=332

[COLOR="Blue"]All lights are on the motor is working[/COLOR]
Which motor?
One of the fans or the compressor?

Check to see if the compressor is on.
You can usually hear it but also should be able to feel it vibrating.

If it is on and you are not getting any cooling at all then it is a sealed system problem and will be an expensive repair as you need a pro.

Check that the evaporator/freezer fan is on.
Check that the condenser/compressor fan is on.

I would also check the evaporator/freezer coils.
If the compressor is on and:
1. There is no frost on the coils, it is a sealed system problem.
2. There is frost in just one area (usually where the freon enters the coils), it is a sealed system problem.
3. If the coils are iced/frosted over to the point that the evaporator fan cannot pull air through them, it is a defrost problem.

Item 1 will give no cooling.
Items 2 and 3 will give some cooling but not enough.
In all cases the compressor will run continuously other than when the unit goes through a defrost cycle.
Be sure that compressor has run at least an hour before checking this. If you do it during or shortly after a defrost cycle you could come to the wrong conclusion.

If it is a sealed system problem check your warranty.
Many units have a longer warranty on the sealed system.

You will have to check the evaporator coils to see what is going on.