ASUS Monitor randomly powering off and on... questions and possible solution

Caleb367

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Aug 26, 2014
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Hi everyone, long-time lurker here.
Here's the story:
I have an ASUS VH222d LCD widescreen monitor. I've had it for about 3 years and I'm quite happy with it, but right now it started to power itself off and back on at random, as in the blue led light in the lower right goes off and on without going into standby and the screen goes dark.
I've tried changing the power cord, to no avail; checking settings on both the control panel (I have Windows 7 x64) and the Nvidia control panel (GT440). Nope.
Then I noticed that the other buttons (the ones for menu, brightness, etc) do not respond either. Not always btw: sometimes they work, sometimes they don't.
So I remembered a similar problem I had several years ago with another LCD screen (can't remember brand or model though): its menu flickered off and on without responding to the buttons, problem solved by removing the control board entirely and assembling a makeshift bypass for the power button (meaning it went always on all the time).
So I removed the cover on my current Asus, unhooked the control board (the one where the buttons are) and booted the PC again. Monitor didn't start up, obviously, so I hooked the board again, pushed the power button, and waited. Several minutes later, it went off by itself again. So I waited for it to turn on again and unhooked the board. Lo and behold, it seems the screen kept working no trouble.
So, my question is: could it be I have a faulty microswitch (but then again why the other buttons work at random?), a board that somehow went bonkers, or (leap of faith here) switches loaded with static electricity? Note that I live in a small town in the hills, and recently we had a load of power outages and flickering due to lightning strikes.
However: right now I left my monitor in standby with the board physically disconnected, this evening I'll try again reconnecting and see what happens.
 
Solution
The boards in LCD monitors are quite fragile, nowhere as tolerant as a pc mobo, and extremely sensitive to both static discharge and overvoltage. It's always possible you may have had a micro-surge that damaged the board. I was already thinking control board even before I got that part of your post. That display doesn't have any common board issues that I'm aware of, and ASUS products are usually fairly high quality, but any electronic component as you know can fail without a whole lot to push it over the edge. You might check into a replacement board. I wouldn't think the microswitch would effect an intermittent random failure with the other controls. The board is the common factor.
The boards in LCD monitors are quite fragile, nowhere as tolerant as a pc mobo, and extremely sensitive to both static discharge and overvoltage. It's always possible you may have had a micro-surge that damaged the board. I was already thinking control board even before I got that part of your post. That display doesn't have any common board issues that I'm aware of, and ASUS products are usually fairly high quality, but any electronic component as you know can fail without a whole lot to push it over the edge. You might check into a replacement board. I wouldn't think the microswitch would effect an intermittent random failure with the other controls. The board is the common factor.
 
Solution

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