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Does it act the same as if the bucket was removed? Likely your fill bucket switch is not connecting. Remove the bucket, press the switch and try to run the unit. If it powers up and "works" then you need to make sure the bucket has a good connection with the switch. If this did not work, remove the connectors to the switch and electrical tape them together and try running this again. If it works, your switch is bad. Replace. If you leave it electrical tape connected, the unit will not turn off when the bucket is full.
My only guess is that there must be a relay inside the control panel that (like many relays) arced ar one time and partially welded itself in the on position. Good quality relays are plated with a high temperature melting point metal to prevent this. Being LG is Goldstar (a Korean company) they most likely use the cheapest relays. To solve this issue the relay needs a hard knock to it. (Don't hit it so hard as to break the circuit-board) :)
There has to be a float switch or sensor that detects the full condition. You may find that the non-functioning control panel is the cause of the problem so the next step is to find out why the control panel does not work.
Runs for a few minutes then shuts off, easy fix. First, remove water catcher and slide filter out and clean it. Then find the two screws that hold on the front panel remove front panel. Make sure the unit is un-plugged. The humidity control dial has two wires connected to it. clip the inner wire. This will keep the unit on full. You could replace the humidity control dial, but why bother?
Take cover off. First check the fuse on the circuit board. If it's blown replace it. That should get the motor running, the motor might be or is going out. If the motor is bad you'll have to replace the motor. If the fuse is good and the motor is good, unhook the wires on circuit board that go to the humidity control switch. If the unit comes on with the humidity control switch unhooked, you'll have to replace the humidity control switch. Sears has them for about $11.50. Hope this helps.