Distortion on monitor screen

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counterstriker

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Jan 27, 2011
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I just bought a new LCD screen(BENQ G610HDA) for my laptop (Acer ASPIRE4250). The problem I am having is that as soon as I plugin the power adapter for my laptop and turn it on a white wavy distortion pattern appears on the LCD screen. It goes away if I turn off the power supply to my laptop and reappears back just as I turn it back on.
I have checked with different sets of power cables for both my laptop as well as my LCD screen and different power outlets for both but it does not seem to matter as the problem still remains the same.
Please help me out with this.
 
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avjguy2362

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First I would try the monitor on any other computer to just to verify it is fine. It probably is. The power supply of your laptop must be leaking some extraneous voltage or interfering with the ground circuit and its getting into the video output to your external monitor. If your Acer is still under warranty they may replace the PS for you. There is a very small chance it is the video driver for your laptop ( I doubt it ), but just in case, it couldn't hurt to see if there is a newer driver for you GPU and try installing that. ( Don't forget to uninstall the old video driver first, then install the new one, if available. )
 
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counterstriker

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I forgot to mention it but I did check it on a different laptop and the LCD screen is working fine on it. My acer is out of warranty. I am downloading the latest VGA driver right now. I do not know what PS is but please let me know how to get it replaced if need be. I will post the results as soon as the latest VGA driver gets downloaded.



 
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counterstriker

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Earlier it was plugged in the same outlet, but I plugged it in a different outlet and the problem still remains.


 
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avjguy2362

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Sorry, PS is power supply. I would be referring to the external power supply brick that comes with your laptop. They are probably expensive from Acer, but there may be a generic that is cheaper that could work too. Just make sure it is the same wattage or higher.
 
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counterstriker

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I had a spare generic PS with me so I checked with that as well. But the results are the same.


 
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avjguy2362

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That's a bummer. That means it is likely a problem with the internal GPU. Any luck with the GPU driver? You should contact Acer or see if they have a forum and if others are having the same problem with external displays.
 
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counterstriker

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So I have just installed the latest driver for my gpu but the problem remains the same.
And if it was a problem with my GPU then why would it go away when I unplug the power supply?


 
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avjguy2362

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Your battery is providing clean power to your GPU and your power supply brick is not. That is my best guess! Somehow the PS's voltage or ground circuits are interfering with the GPU's video output. I remember someone with an Asus laptop had a similar problem and Asus was aware of it and was replacing the PS's for their customers, but in your case, I think the problem is not your PS specifically, since your other PS has the same problem, but instead it is a problem with the way the power supply's voltage and ground is routed to the GPU. When you run off the battery you are not connected to your houses ground too. You could try your laptop and monitor at someone else's house. Perhaps you have a very bad ground at your home which is not letting the power supply work right. There could be some current in your houses ground and it is leaking through to your GPU when the PS is plugged in.
This is a bit out there, but if you wanted to check your homes ground you would have to run a wire to an outdoor water faucet ( they make pipe clamps for this from a hardware store ), a true ground, and use a volt/ohm meter to see if there is any leaked current or voltage in the common or ground circuits in your house. IF you are not familiar with home AC, don't try this, you could get shocked!
Try your system at someone else's house first. If it works fine there, then it is your house's problem. If it is the same ( which I am guessing is probably the case ), then it is internal to your laptops PS circuitry.
 
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counterstriker

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I did not mention that I dropped my laptop yesterday and broke its screen. That was the whole reason behind buying the new external LCD. And the point of contact between the floor and my laptop was on the same corner where the PS gets plugged in. Might that have caused some problem?


 
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