We have a 2 door freezer on bottom lg refrigarator. It is getting ice on the bottom and door won't shut. It looks like a leak but can't find it?

Have you checked that the door is closing ok and that the door seals are meeting the door frame all round?
Do the things that freeze sit at the top of the freezer? if so it could be
the coolant gas has slowly leaked out. A good indication this has happened is that the bottom of the freezer is a lot warmer than the top. To repair a serviceman will first cut the coolant pipe and drain (and capture) the existing gas and then recharge, re-pressurise and seal.

Water leaking from bottom of freezer door.
It means that the freezer door is not closed will see the rubber frame it maybe broken some where or twisted .
If it's broken it must be changed but if it's twisted you can use some medical cotton roll it by your hands like a pen and insert it behind the frame.
I hope that help you. so sorry for my bad English.

Look on the back of the unit for a plastic hose coming out the bottom to a drain pan usually sat on top of the compressor. Bend a straw and push up inside. If it won;t go, there is a blockage, usually ice in the drain. Fully defrost the freezer and blow through the straw until clear.

If we have ice on the inside of the freezer it means air is being pulled into the box somewhere. The most likely place is the door seal, it sounds like you already checked it, but I would suggest that you look very close at the bottom and aides of the seal too, it could be leaking in air from there. Check the inside liner for cracks and seal them if you find any. Look at the corners of the cabinet to make sure there is not room for air to come in.

Air leaks will lead to frost, it is just hard sometimes to find where it is leaking in.

Ice cubes WILL BE slightly moist when they land in the ice bucket. they've just been slightly melted in order to eject from the ice maker. Stop playing with the settings, for starters. put them back to normal, i.e., middle setting, place thermometer in center of freezer, and if you can, one in center of fresh food. monitor after 24 hours, and for the next three days thereafter. freezer temps should be in the -5 - +5°F, sometimes up to 10°, fresh food should be 35-40, sometimes up to 44°at the normal settings. If you are not having temperature issues, see if you notice any frozen drips of water on the underside of icemaker, indicating a possible crack in the ice maker mold, or a faulty water valve. You didnt include your model and serial number, so not knowing the path of the ice shoot, some go out the freezer door, some slide over and get dispensed from the fresh food side. Its possible you may have a problem instead with the flapping door that opens to allow ice cubes to be dispensed, or similar type mechanism. If this door does not seat completely when its closed, it will leak warm air directly into the ice bucket, which would make them slightly moist, also too, this warm air can cause frost and ice to buildup near the warm air source...look for any unusual forms of ice and or frost leading up from the flapping door to the ice bucket. Also look for any gaps in the door gasket when closed, this warm air leak can also cause similar problems, but its most likely with the ice door. could be the door, the spring, the solenoid, or something else i wouldn't know without personal refrigerator inspection.

get down on the floor and look along the bottom of the door to make sure that the door seals are touching.if not and you have an air leak it will cause frost.if its ice and not frost then check all vents/drains are clear.

you probably have an air leak. if the gasket is bad it needs to be replaced. Air could also be coming in through the door flap if you have water and ice dispensor on door

ice on top of freezer door they came out with a fix but does not work two vent holes on bottom of door seal mthem off with silicone moisture getting in if that don't work you need to take liner off and spray foam the liner cavities

Causes:

High humidity in the immediate area causing condensation to freeze at the door opening

A frozen defrost drain line not allowing water to drain off when the unit is in defrost

A bad door gasket causing an air leak

Some freezers have a heated perimeter to reduce condensation. If the stop working, moisture can accumulate arounf the door perimeter and freeze.

Leaving the door open too long or something obstructing the door

good day,
hope this link below will solve your problem.

ref