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Michael, I suspect that the water solenoid valve needs replacement--that symptom usually causes either a slow leak and an overflowing ice cube tray or no water flow at all. To test the solenoid valve, slide your refrigerator out and view the back cover. There should be a double solenoid valve down near the bottom back of your refrigerator, one solenoid valve for the water serve spout on the front of the freezer door, and the other solenoid valve for the ice maker. I'd swap the clear plastic lines (to the door water spicket and the icemaker, put a plastic cup under the door water spicket and check in a few minutes for water leaking into your cup--if it does leak into the cup, you've found the problem! There are seval excellent videos on the web covering how to replace the valve, see: http://www.appliancepartspros.com/lg-water-inlet-valve-5221ja2006d-ap4445614.html
That solenoid is controlled by a cam driven switch built into the ice maker motor assembly which can occasionally go bad and need replacement or adjustment, but my experience points to a leaking dirt plugged-open water solenoid valve. Replacment solenoid valves are easy to replace at a cost ranging from $20 to $78 with free shipping to your doorstep--check ebay!
If it does fill with water, but does not eject the ice cubes to start a new cycle, I would suspect the ice maker motor(Item 37). BUT if it is the motor, that part costs $91.22 and you can replace the entire ice maker (Item 100) for $157.95
If it overfills and drips, look for an
adjustment behind the plastic endcover with a +/- on it. - is less water. If it continuously drips, replace the water
inlet valve on the back where the house water supply comes in.
The water inlet valve on the back of unit opens when the ice
maker needs water. If the valve doesn't seal good because of sediment or wear
it will continue to drip and when the water reaches the ice maker supply tube
it will freeze.You can take the water
line off the valve and watch to see if it drips.
It sounds like the water tap from the source is clogged, or the vinyl tubing running from the water source is crimped somewhere. I would check the tap first to make sure the valve is not clogged. You close the valve clockwise ,then remove the tubing. Have a bucket handy. Open the valve counterclockwise a little at a time until water started to drip. Place the bucket under the valve to catch the water. Open the valve a little more and let the water go into the bucket. Do this until you are satisfied that the tap valve is not clogged. If this does not solve the problem then check the tubing to see if you have crimps in the line. Then close the tap valve clockwise down tight. remove the tubing from behind the frig and if you have enough slack, take that end to the tap valve and the bucket, place the frig end of the tubing in the bucket, open the tap valve until you are satisfied the flow is nomal., close the tap avel and hookup the frig end. Open the tap valve an the test the water dispenser for flow.
When you push the button, the CLICK you hear when the water flows is the Water delivery solenoid opening to let water thru, then snapping shut when U R done. The Spring is weak (prob wrong type, size, strength at factory) or the valve seal is cracked, torn, hardened or crushed.
Since all this is inside the door, you will either have to take it apart to see/fix/replace.
Quick fix: turn down the water pressure coming in(?)
Call Mr. Handyman to fix.
If under warranty - they might fix this for you for free If this is a factory defect, there might be a recall in place for repair/replacement parts
Googlee both - Make/Model + Dripping Valve + Recall Good Luck!
First remove toe panel...Under the freezer door there is a water line connection.. press in on the outer ring and pull out the water line to disconnect....get a cup to catch the water ... then press the water paddle if water comes out you have a frozen water line in the door.. it no water you have a bad water valve... let me know if it helps