During the wash cycle of the 24" combo washer dryer, it leaked

Sears Parts Direct is one source of the parts diagrams, https://www.searspartsdirect.com/model/1vc37q1bdj-003204/lg-wm3987hw-washer-parts . See the Dispenser assembly parts diagram for the water inlet valve. If you can watch the entire cycle, try turning off the shut-off valves for the washer inlet hoses after the rinse cycle and before the dry cycle starts. Water should not flow into the washer/dryer with the shut-offs closed.

I've seen inlet valve solenoids fail in the open position or in the closed position. I've never seen a control board that sent open messages randomly. (Sometimes, there is damage to the control board or corrosion or damaged wiring that stops the control board from sending the open/closed message to the solenoid.)

I hope this helps.

Cindy Wells

Check the valve if there is issue to need to replace

FIRST HAVE TO DETECT FROM WHAT AREA IT IS LEAKING B4 WE CAN HELP? PERHAPS A HOSE OR CLAMP CAME LOOSE. ETC

Main bearings. Dump it.

In all occasions it is important that your observation is most important and so is vital to the identification /rectification and solution. If you have noticed that water has leaked then as the drain hose pump/valve and fittings are located on the underside of the machine it is important that you look for possible leaks here. In some cases the drain hose would be clogged at the drain end to outlet of the house and so there will be back flushing resulting in overflow to the outside. Also the drain pump/valve can be clogged or the drain hose clamps can be loose on the grip which can all cause the leak to occur. Removing and cleaning the drain pump/valve, tightening of the hose is also very important. Also water can leak if there are gaps on the front door gaskets and must be checked but this will happen only during the cycle and not on the drain cycle end.

Tips for leak: http://www.espares.co.uk/advice/washing-machines/a/7/1461/do-you-have-a-leaky-washing-machine.html
Replacing Door seal: http://www.espares.co.uk/advice/washing-machines/a/7/1464/how-to-replace-the-door-seal-on-a-washing-mac.html

Could be that the RPM is not enough for the spin as the BELT is loose or slipping or if the motor speed is less due to a worn out CAPACITOR.
Try with a longer drying time or manually dry to confirm .
Also check if the inlet valve is working at any time during this cycle to we the clothes, if so there could be output from the control panel which could be a suspect.

balance legs on washer again off balance after so many washes.

The front panel comes off and you will be able to trace the water source. These combo units spin immediatly and if the drain is slow the water will spin up over the edge of the tub during drain.
Eric

When you replace the pump, always to remember to makes sure the pump is pushed all the way in so that the shaft has a good grip. Try taking it out and pushing it all the way in. The 4 legs should touch the motor, as you put the 2 little clamps on the top and bottom.

Good luck, I'm pretty sure it's something really basic with the pump :)

You have a sock caught in the pump, need to pull off outer case and remove pump and clear it out.