Horizontal flickering ghostly on external monitor?

I have a HP Pavilion dv6654us notebook PC, which has an Intel GM965 chipset with integrated graphics X 3100.  Connection to an external monitor gives a horizontal flicker.  It's barely noticeable on white, but very noticeable everywhere else.  It also seems to degrade the color of my images.  I checked the VGA port on the side of my laptop, and it is clear and without any obstruction.

I am currently using Windows 7 Ultimate, but this same question occurred on each operating system that I have used this monitor on this laptop, including several distributions of Linux and Windows Vista.  I currently have the latest version of the BIOS, however, it has occurred in each version, I've tried.  All operating systems are the latest available Intel video drivers.

The monitor is an Acer X223W.    This monitor is not the issue, as I have the mid-tier business computer laptop Dell with a GM945 from Intel that does not cause this problem at all.  On my HP, the problem occurs on the external monitor at all resolutions.  Changing the mode on my Intel video has also no effect, this problem occurred as well in extended mode and when it shows only on the external monitor.  It does not, however, affect the LCD screen of my laptop or any non - LCD external monitors such as projectors.

I want to check on what think about this on the forums before involved me in the - what you must admit - horrible support HP offer process.

Message edited by zwaldowski on 04/13/2009 14:24

I suspect that you have a ground loop problem. Ive seen on many laptops over the years and not isolated to just HP. Your monitor probably has one to three pins taken and then motive. Your portable computers adapter likely has a PIN of three institutions and began to land. But your laptop computer likely (as you can see on the cable that goes from the adapter to the laptop) did NOT have a motive. You end up with a ground loop in the monitor and therefore noise.

The only solution I have found is I took a spare power cable and removed the PIN to the ground for the monitor. You can simply use an adaptor which only has 2 pins but accepts three. The later version Id suggest trying. Worst case your outputs 50 cents.

Now, keep in mind that the ground is there to protect you in force. ID never suggest to do this but I can almost garauntee it is your problem. I guess that the engineers did not design laptops with the ground because they are such low voltage. Nevertheless, it is a bad idea and in my humble OPINION evil genius. They should have a reason for scenerios just like that.

I'd like to note this is not the fault of monitors. Ive seen with dozens of lcd and crt monitors. Its the fact that the laptop has no grounds.

Tags: Notebooks

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