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My ASUS LCD monitor will sometimes black out with indicator led ON and won't return to normal unless i turn off and on again (monitor is still detected as ON by computer). This has been happening for long enough (5 yrs) and isn't frequent (usually happens once a month/two months)

-I've changed hdmi cables, monitor power cords, power outlets, i even change from computer to a totally different one.

-I'm not sure if monitor is broken since works fine most of times and this is not that frequent. I do a heavy usage of him.

-I suspect something related to home wiring interference or a power sag but I'm not sure if it's possible since this is the only device i notice some malfunction.

This is bugging me and i have no clue.

  • If you hit the monitor with the palm of your hand does the display reappear? How about hitting it on the other side, the top, the bottom? (I realise it may take you a month or two to have the opportunity to check that.) If so, then there is a loose connection/dodgy solder joint somewhere inside. If the monitor happens to fall off the table and smash, then you have a good reason to buy a new one. – Andrew Morton Mar 18 '18 at 20:23
  • What is your OS? It may be in the power settings, it's either going into hibernation or similar – Jack Mar 18 '18 at 20:28
  • A computer problem is really more on-topic on the Super User sister site than the Home Improvement site, even if you suspect a power issue. You might want to flag a moderator and ask to have it migrated. – fixer1234 Mar 18 '18 at 23:06
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My gut feeling is that the monitor is going bad. If the display usually works well, I'd suspect either the main board or the power supply.

There are other devices more sensitive to AC brownouts and fluctuations of voltage, like incandescent lightbulbs. Electronics are usually more resistant to brownouts as they have elaborate power supplies designed to protect against mains undervoltage (many power supplies are rated for anything between 100V and 240V). Do you see the lights in your house dim once in a while? (LED and CFL lights, depending on design, might not be affected by mild to moderate brownouts).

Unfortunately, it is usually very expensive and impractical to diagnose LCD monitors and televisions, due to their inherent complexity and the unavailability of service manuals, and replacing parts like the screen, the main board or the power supply is often almost as expensive, if not more, than simply replacing the whole device with something new, and the replacement part will likely exhibit the same problems in a few months or years.

  • Apparently it's been doing this for 5 years, so I would think that a failing capacitor in the PSU would have completely failed by now. – Andrew Morton Mar 18 '18 at 20:18

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