HELP - External monitor of laptop flickers when power cable plugged in
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From: ennioennioennio on 2 Apr 2008 10:07 Hi, I've got a Sony VAIO FE11H. I've found this issue, wich is very annoying to me. When i connect an external monitor to my laptop i get some horizontal flickering: it only happens when the power cable of the laptop is plugged in. When i disconnect the power cable of the laptop and it is powered just by its batteries the flickering disappears instantly. I've tried using a surge suppressor: no luck. I've checked the ground of my electrical system, and it's okay. I've tried connecting my laptop to a different external monitor in a different electrical system: the problem persists. So i think there's something wrong on my laptop. Can anybody help me please?
From: Clark on 2 Apr 2008 10:32 ennioennioennio(a)gmail.com wrote: > Hi, > I've got a Sony VAIO FE11H. > I've found this issue, wich is very annoying to me. > When i connect an external monitor to my laptop i get some horizontal > flickering: it only happens when the power cable of the laptop is > plugged in. When i disconnect the power cable of the laptop and it is > powered just by its batteries the flickering disappears instantly. > > I've tried using a surge suppressor: no luck. > I've checked the ground of my electrical system, and it's okay. > I've tried connecting my laptop to a different external monitor in a > different electrical system: the problem persists. > > So i think there's something wrong on my laptop. > Can anybody help me please? Maybe it is ok on your system, but I don't think I would be plugging an external monitor into my system while it was running. Clark
From: ennioennioennio on 2 Apr 2008 11:57 > Maybe it is ok on your system, but I don't think I would be plugging an > external monitor into my system while it was running. I don't plug the external monitor while my system is running. And i'd like to underline that it's only the external monitor that flickers, and it doesn't matter when i plug it.
From: Clark on 2 Apr 2008 12:54 ennioennioennio(a)gmail.com wrote: >> Maybe it is ok on your system, but I don't think I would be plugging an >> external monitor into my system while it was running. > > I don't plug the external monitor while my system is running. > And i'd like to underline that it's only the external monitor that > flickers, and it doesn't matter when i plug it. Sorry I misunderstood what you were saying. It sounds like some interference in coming in through the external power supply. Have you tried replacing it? If it is not there, then possibly the on board power filter is having problems. Can you run the computer without a battery and check it then, just to see if it has any effect? Clark
From: GT on 3 Apr 2008 10:11
<ennioennioennio(a)gmail.com> wrote in message news:57fffa43-aaf9-4bd6-8251-be1537d92cfe(a)e39g2000hsf.googlegroups.com... > Hi, > I've got a Sony VAIO FE11H. > I've found this issue, wich is very annoying to me. > When i connect an external monitor to my laptop i get some horizontal > flickering: it only happens when the power cable of the laptop is > plugged in. When i disconnect the power cable of the laptop and it is > powered just by its batteries the flickering disappears instantly. > > I've tried using a surge suppressor: no luck. > I've checked the ground of my electrical system, and it's okay. > I've tried connecting my laptop to a different external monitor in a > different electrical system: the problem persists. > > So i think there's something wrong on my laptop. > Can anybody help me please? If you elliminate the mains versus battery element of this, it sounds like a simple refresh rate problem. The laptop screen will be refreshing at 60Hz (LCD), so it sounds like the external monitor is using the same refresh rate. Plug in the external monitor, then right click on your desktop and choose properties on the menu. In your settings tab, you should be able to click on the picture and change the resolution and refresh rate of each screen (may have to click on advanced for the refresh rate part). See if that helps, if not then the interference points raised by others is more likely. I would always try to elliminate the simplest thing first! |