Was it bought off eBay?

Does it get any sign of power whatsoever?

It might be some super basic problem, like a bad solder joint

Hello thanks to reply.

I found it on the street, a man was putting it and a desktop computer. He tell me the screen was working. But after I wired it and try to switch on, nothing happen. Normally CRT emit a sound when swith on here nothing no sound, even the light's button stay off. This button is in the feet of the screen, that why i serach for docs about this screen.

I used to have that monitor, it's sooo heavy 😁

You should be looking for the "A901HT", its actual product code, the service manual is available online:
https://www.manualslib.com/manual/1216248/Iiy … er-Pro-450.html
and here
https://elektrotanya.com/iiyama_a901ht-vm-pro … r/download.html

Be careful with it - big voltages in there. From what I've seen about monitor repair, it's usually a cracked solder joint, which with such a heavy screen can happen quite easily when it's moved.

My iiyama Vision Master 1403 (LS704UT) is showing shaking on the vertical axis. However I can't seem to find the service manual. Is this a common problem and if so what would be the required fix?

EDIT: found the service manual at https://elektrotanya.com/iiyama_vision_master … ownload.html#dl . I guess I'll check the various components, with the usual precautions.