Don't go onto Amazon and order a random cheap ac adapter for any console that you have. They create a bunch of noise on the screen and it leaves a trail of flickering pixels going up the screen.
Learn how to recognize certification marks. In the US, the UL mark is common on electronics, and the FCC mark means that it won't have RF emissions that interfere with other electronics. In Europe the CE mark is used. I've also seen TUV marks apply in both places. However, I have had bricks that worked perfectly well in the US which only had CE and FCC marks.
Your brick had no marks at all, so who knows whether anyone at all tested the design. Many electronics manufacturers simply buy their pre-certified bricks off the shelf and slap their own label on them (keeping the marks), specifically so they don't have to pay for the certifications themselves