There is a sound of running water in the toilet, and the main valve will still ring

It is the spring of the toilet button that does not jump up, and let's get stuck, check it and look.

What to do if the toilet tank keeps running water.

There is always a slight sound of running water in the toilet tank because the float valve is not completely closed, there is a little gap, so it is constantly flowing, just replace the float valve.

It may be a leak, but it's not surprising that you say there is a sound, and when you flush, there is no water in the tank. But there is a drop when the water is collected. >>>More

The float in the toilet tank fails, you can lift the float up gently, and the inlet valve will be closed, if you want to repair it thoroughly, you have to take a closer look at what hinders the float from going up, under normal circumstances, it is astringent after a long time.