Can’t connect to YILAI YIXD05YI 480 ceiling light via app

Got the lamp, Yeelight Remote control support confirmed. There are other problems:

  1. Buzzing noise, see https://youtu.be/7A8835mNjgk
  2. Afterglow, rather, LEDs are always on, see https://i.imgur.com/rmCNJAQ.jpg

What’s buzzing on the PCB? How to fix glowing LEDs? Isolated GND does not help.

If you could ship me the replacement board or just instructions how to fix it that’d be great.