Why is my screen jumping when using my XBox?

Hello everyone,

I have a problem with my XBox first generation for some time now and I don’t know why. When I plug it in, it turns on great, the sound is good, the game launches but the display is jumping. Here is a video of it:

I tried to remove the dust from the cable and the outside but it didn’t work so I opened it up. Here are some photos of the inside

Where do you think the problem is coming from? Do you see anything unusual or did you have the problem yourself and know how to fix it? I am open to any idea to fix my old pal ☺️

Thank you in advance,

• Flokuche