Last weekend I also just fixed my Deka fan as well...most of the time it's the capacitors. But the problem is which one? Normally it has 2 capacitors and also it could be diodes too...the parts are cheap less than RM10.

So I went to a shop in Jalan Pasar - Smart Electronics Repair and Services (next to a dobi and opposite the School Chin Woo) cause they can help diagnose which component are not working.  End up paying RM25 to change one capacitor and one diode, slightly costs more but hassle free...went back install the board and its working like a charm now.