Hi @albertoimag
No images at all, including no OSD seems to suggest a problem with the mainboard in the monitor, unless there is also a tcon board in the monitor as well.
You may have to open it up and check if the cable connection between the mainboard and the display (or the mainboard - tcon board -display if there's a tcon board) is OK or if there's any obvious damage on the mainboard.
Looking online for parts for the monitor only found this one [https://www.aliexpress.com/item/1005003946676308.html|mainboard] supplier which may help. You may have better luck finding other suppliers if you decide to replace it.