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16:9 LCD monitor with a 1600x900 resolution.

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What would cause the power to the monitor to be unstable?

I got this HX2000 used a few years ago, so I do not know the history of the unit prior to me getting it. That being said it has been working very well so I do not think the monitor is in bad shape internally. However, I set it aside because 900p has largely fallen out of favor and can be difficult to live with. I have pulled it out of storage because I have plans to use it for a few projects I am working on. Anyway, this monitor has 2 different issues:

  • Image ghosting

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  • Inversion problems

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For reference, this is how I tested the monitor. What is throwing me off is I don't see typical signs of failing capacitors. While the capacitors look okay visually, it isn't out of the question. It still has the original capacitors as well. From what I see, it looks like a panel or input board problem.

While I am willing to attempt a repair, my budget is limited because of some panel chipping that doesn't affect the monitor to the point of being unusable (with many being surface level) but one of them extends to the entire LCD itself (but is isolated). I'm flexible on this, but I'd really like to stay under what a typical used LCD monitor (in working condition) will probably cost locally (~$20-30, most likely). I'm going to say $10 is my hard limit. The local Radio Shack closed some time back, so I can't buy the capacitors for $1-2 each locally to recap both the power supply and input board anymore.

Update

Here is some photos of the capacitors on the video board and power supply, along with the panel damage

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Contestado! View the answer Yo también tengo este problema

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Solución Elegida

From your pictures I'm afraid I'm having difficulty seeing what the problem is.

You can't reliably assume an electrolytic capacitor is good if it shows no signs of swelling or leakage. It's worth getting a cheap component tester - you can get a bare-board on from the Far East for under £5. Only a couple of weeks ago I had to replace 3 electrolytics in a sound mixer which looked just fine, but one read half its rated capacitance with 11% loss and the other two were open circuit.

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I've never replaced the caps in this monitor. I t has very low hours (1,900 combined) but it was made in 2009 and uses the cheap caps I regularly see in consumer monitors. I got it when it was already 6 years old as well. Sadly I can't ignore it for the term of the project since the hum gives me a headache.

In the past I've had good luck with visual inspection over the years. I know it isn't perfect but bad caps usually look bad most of the time; that's why I use that method.

My camera makes it hard to see. I know :(. I tried but the camera doesn't show the problem.

It began making the transformer hum that goes hand in hand with bad capacitors in most situations, so some of them got to that point. I'm probably going to do a partial replacement, but replace the entire area that's bad. Yes, this happened when I visually inspected the caps. I know it's not ideal, but the (poor) shape of the panel makes it hard to justify a full recap.

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Sorry I forgot to accept an answer on this :(. I got busy and forgot I asked this.

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