04-13-2009 03:23 PM - edited 04-13-2009 03:24 PM
I currently use Windows 7 Ultimate, but this very same issue has occurred on every operating system I have used this monitor on this laptop with, including Windows Vista and multiple Linux distributions. I currently have the latest BIOS, however, it has occurred on every version I have tried. All operating systems have the latest Intel video drivers available.
The monitor is an Acer X223W. This monitor is not the issue, as I have amid-range business Dell laptop with an Intel GM945 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 also has no effect, this issue occurs both in extended mode and when only showing on the external monitor. It does not, however, effect my laptop's LCD screen or any non-LCD external monitors such as projectors.
I want to check on what people think of this on the forums before I get involved in the - what you must admit - horrible process of support HP offers.
Solved! Go to Solution.
04-18-2009 11:02 AM
I suspect you have a ground loop issue. Ive seen this on several laptops over the years and not isolated to just HP. Your monitor likely has a three prong plug and hence a ground. Your laptops AC adapter likely has a three prong as well and itself is grounded. Yet your laptop likely (as you can see from the cable going from the ac adapter to the laptop) does NOT have a ground. You end up with a ground loop back into the monitor and hence noise.
The only solution I have found is I took a spare power cable and removed the ground prong for the monitor. You could just use an adapter that only has 2 prongs but accepts three. The later Id suggest trying. Worse case your out 50 cents.
Now keep in mind that ground is there to in effect protect you. Id never suggest doing this but I can almost garauntee this is your issue. I suppose engineers dont design laptops with a ground as they are such low voltage. Regardless its a bad idea and IMHO bad engineering. They should have a ground for scenerios just like this.
Id like to note its not the monitors fault. Ive seen this with dozens of lcd and crt monitors. Its the fact the laptop has no ground.
04-18-2009 05:17 PM
11-09-2009 07:38 PM
12-10-2009 10:16 AM
I just received my HP 2159 monitor and noticed the same flickering once it was hooked up. Came to the HP support site to see if I could figure out the problem. Thanks for this post/solution. The 3- to 2-pronged adapter seems to have worked and saved me hours of fidgeting with setting or calls to HP!
04-18-2011 04:48 PM
Hi The horizontal flickering is really hard on the eyes!!! I am prepared to try the removal of the ground on the adapter - but why would the problem occur when I am running the laptop on battery without the adapter plugged in? Please make any suggestions
11-21-2011 11:02 AM
HUGE thank YOU
I bought a NEC EA232 monitor last week and had exactly this problem. Contacted NEC immediately, they suggested it was a faulty monitor and sent out a new one the next day. Same problem! Changed cables, no change. Then tested it on 2 other laptops, a 2011 LG 13" and a 2008 Samsung 13", neither caused the problem!
Anyway I will let NEC Germany know of this solution, and see what they say.