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02-24-2022 11:39 AM - edited 02-24-2022 11:41 AM
@antoniodeg -- what electronic items are near to the screen? External speakers? Cable-modem?
Does your computer connect to the Internet via WiFi?
Any of those devices can create electrical interference.
Does that "Moiré" pattern disappear when those items are moved away, or when the monitor is moved further away from those items?
Experiment: disconnect the monitor from the computer, and unplug the monitor's power-cable from the power-socket (power-bar, or wall-socket). Move the monitor to a different room, and power it on.
Do you still see that pattern on the screen?
02-24-2022 11:50 AM - edited 02-24-2022 11:55 AM
@antoniodeg -- does your monitor have the OSD (On Screen Display) buttons?
If it does, open the OSD, and see if there is any option to "degauss" the screen, to eliminate any electrical issues with the display.
Can you temporarily disconnect the monitor's display-stand? Does that change the pattern?
If you move the "power" and "video" cables, does the on-screen display change?
P.S. All the electronic technicians who used to do "board-level" repairs of TVs and monitors have either retired, or have changed jobs. When monitors cost 5 to 10 times as much as they now do, it was cost-effective to hire such a technician to do a repair. Now that new monitors are inexpensive, and that monitors from any "Thrift Store" are $10 to $20, it is cost-effective, but bad for the environment. to replace the monitor.