"No signal" and blackscreen

[chaotic person]

Hello, (sorry for my bad english ^^') I worked on the Huion GT-185 tablet for 3 years without any problems or bugs and for the last two weeks it doesn't light up anymore. When i switch on the device, the logo huion is displayed but less than 3 seconds after, the screen becomes black and there's an error message who says "No signal"... 

I tried everything and every internet tip i found but nothing works.

I hope soemone maybe can help :,D