Just recently repair my KDK fan noisy sound when start to spin.
It will start slow turning and the humming sound. Specially 2nd speed.
After searching some answer from the net and how to repair, I start to open up the fan.
The problem is the few capacitor in the control board. But you need to check it out which capacitor is giving out the problem.
This is the controller board. Unplug the 2 connector and release the 2 hook to take out the board.

You need to solder out the capacitor to check the value.

Using multimeter (those can check capacitance). This capacity slightly off from the actual value.

This wan also out from the actual value.

Have total of 3 capacitor is out of the actual value. Go to electronic shop to get the component. Solder back, install back the board. Run like charm. No more humming sound.
Total component cost is below RM10.
You need to have some soldering skill and a multimeter . If you don't have the multimeter, than just solder out all those capacitor indicate and get a new wan. All the capacitor still won't cost you more than RM20.
This post has been edited by ozak: Nov 27 2017, 08:48 AM