My fridge has water pooling on the top shelf

seems to be a condensation proble, is it possible to lower down fridge temperature a bit? This may solve the problem.

Sounds like you have a frozen drain in the freezer. You can remove the back panel of the freezer and take a turkey baster and run hot water down the drain line to clear it. Once its cleared you will want to dump an additional cup of water down to make sure that its clear. This will stop the defrost tray from overflowing when the unit goes into defrost. This is where the water is coming from.
Hope this helps _MJ_

the drain in the freezer is clog make sure the drain from the freezer is clean all the way to the pan next to the compressor . you need to open the back wall of your freezer for that ( the inside wall) clean with buster (water pump)the drain is in the bottom middle of the freeze.

check your gasket on the refridge door see if it has any rips or you have a blocked drain in freezer

at the back there should be a drip tray if this is full it will leak onto the floor it could be this, it could also be the drain in the fridge is blocked on the back there should be a self made into the back with a hole in it this is to go to the vapure, the part i was on about before, the tank is on top of the pump and its hot so turns the water in to vapour, usually there is not a lot of water but if the pipe becomes blocked it stores the water in the pipe and then lets it go in one full step over flowing the container. to clean the pipe out you can use a flex line or a net curtain rod, push it down and up the hole a few times the blockage will fool to the bottom or come out on the flex.

Hi!!! Your drain line is plugg, also there might be some dirt plugged so remove the evaporator panel are clean the drain line..

Has the refrigerator got a wet inner back?
Ff this is wet, adjust it until this solid ice 'blobs', bt not encrusted, like in a freezer
The refrigerator may not be cool enough and the natural warm moisture allowed into the cool compartment when the door is open is condensing into fluid before it is cooling sufficiently to suspend the moisture as a vapour. If the cool compartment is cool enough, any warm air admitted ill be chilled before it is allowed to condense, keeping the refridgerator dry.
However, the only drawback is that you will have to monitor it to prevent the build up of excesive ice.
Also, whether the refridgerator is either empty of full willaffe the day to day operation.
Hope this helps.

Your problem is a blocked drain which prevents melt water from the defrost from getting out. You'll have to expose the coils and find the drain hole. It is possible that the problem can be on the other end of the hose...where it hits the evaporation pan in the bottom of the unit.

My Whirlpool fridge had water droplets falling onto all three shelves and pooling unter the crisper drawers. I solved the problem by clearing the ice-clogged drain in the freezer.

In Whirlpool model ET21UM, the condensation drain hole is located directly behind the freezer. To access the drain hole, remove all your frozen items and place them in a large picnic cooler. Notice that the floor of the freezer is basically a large plastic tray fastened by two small bolts. Unscrew the bolts with a wrench or ratchet and remove the plastic tray. At this point you will probably see that water has seeped under the tray and created a mini ice rink on the bottom of your freezer. You can tap the ice lightly with the handle of a screwdriver to break it up. Once it's broken, toss the ice into your sink, or put it in a plastic bag and store into your cooler to keep everything cold.

Once the ice has been removed from the freezer floor, you should be able to see a metal drip trough in the back under a false wall hiding the condenser coils. It's a little tougher to remove the ice from the drip trough with the screwdriver method, so you might want to use a hair dryer. After a few minutes with the hair dryer, you should be able to remove most of the ice by hand. You can remove any water with a sponge or turkey baster. The only ice left will be a plug of ice in the drain hole in the middle of the drip trough. Heat up a cup of water in the microwave and carefully pour it into the drip trough. If the drip trough is hard to access, you might need to use a funnel. The hot water should melt most of the ice in the drain hole. If it pools in the drip trough and doesn't drain, use a sponge or turkey baster to remove the water and add hot water again. A small length of wire or a pipe cleaner might help clear any other obstruction in the drain hole. When the drain is clear you should hear water flowing through it. Dry off the floor of the freezer and return the plastic floor tray to it's spot and fasten with the two bolts. Remove any water that has pooled in your refigerator and you're done.