Yeelight 650 no power on

Hello. I recieve Yeelight 650 26 november from ali. 1 month it work perfectly. But in 26 december, then the light was working i try to switch it off by the yeelight remote control. The lamp is not switched off. Then I power off lamp by the wall switch. After that, I try to switch on by the wall switch - lamp not working. Try to on off 5 times - not reaction. Try to wait a lot of time - not reaction, no visible in app. Not lighted on, the status is offline. Firmware is the last.
I open the lamp - power is getting to plate - 230 V. The fuse - OK.
Is the solution for this?
Or the plate is dead?

Where i can buy moterboard for Yeelight?