How many shock absorbers are in washing machine LG F1480QDS

Some basic troubleshooting: the water has to be going somewhere. If the water is going in but not staying in, that means it's going out, and if it's not spilling out on the floor, that means it's going out through the drain hose. Can you see water going out the drain hose?

If so, is the outlet of the drain hose lower than the level of the washer's spinning basin? If so, then that's where the water is going. You've turned the whole washing machine into a big water level and one side of the level (the drain hose) allows water to escape, so it's escaping. Solution: raise the outlet of the drain hose somehow.

If the outlet of the drain hose is already higher than the level of the basin and water is still coming out of it, then it sounds like the pump is prematurely pumping the water out for no good reason. Can you hear the sound of the pump? I'll defer to someone who knows more about washing machine repair if this is the case?

The humming is the drain pump, not the motor.

You probably have an electrical problem - some wire someplace is broken (probably a wire going to the motor, perhaps a sense wire, or for high speed power). I had this happen to me and diagnosis said to replace the main control board for $$$.

But before doing that I checked it closely and found a cracked solder join (i.e. one wire was not making a good connect). I reflowed the solder and all was well.

But I did this myself - and it took a long time. For you to pay someone to check this for you will probably cost more than just getting someone who does this for a living to just diagnose and fix it.

Unless you are really good friends with someone handy? Usually if you take apart the machine it will have documentation telling you how to diagnose it.

First thing to do after following the instructions on the documentation is carefully check each wire going to the motor, and check the board where the wire goes for a loose connection.