AC Adapter Interference

I just got a new LCD monitor and noticed some very visible horizontal flicker. It seems that these flickers are caused by the AC Adapter of my G1S -- that is, whenever my AC adapter is plugged in. Any ideas would be greatly appreciated.

 

Do you mean an external LCD or a replacement internal LCD?

Have you tried a different outlet/moving the adapter around?

 

I've heard of this happening with laptops before, but I'm not sure what fixes it. Try using a surge protector or even a UPS. If that doesn't do it, try another AC adapter, I suppose. Hell, if you have a Best Buy near you, you can probably ask to use the display model's adapter to test (they should have the G1S).

 

It's an external monitor, a 22' Samsung SyncMaster.

 

The AC adapter is plugged into a pretty hefty surge protector. I'm pretty sure now that the absolute cause of the problem is the AC adapter. So that leaves me with some new question.

1.) Would any Laptop adapter be suitable for the G1S or does it have to be similar to the ASUS one?
2.) How is interference rated for laptop adapters? I mean since it's most likely I have to go get another one, I might as well go for one that offers the lowest interference levels.

 

Is your AC adapter 3 prong (As in at the wall/outlet end)? You could try using one of the three to two prong adapters. This would eliminate a ground loop if there is one.

This isn't a great solution as they did design the adapter to have a ground for a reason. But you see some (Apple) adapters that come with both a two prong and a three prong. And you see plenty of people leave two prong adapters on their laptop power supplies for when they're in areas without 3 prong outlets.

 

Gorn is on the right track with this. What you have is a ground loop, which can be caused by many things. Poor power supply design, poor grounding practices, and poor cables are the usual causes.

I'm guessing you are using VGA instead of DVI or HDMI. There is more info in this thread - http://forum.notebookreview.com/showthread.php?t=128504&page=21&highlight=deputy963.

The 3rd (round) prong is definitely there for a reason, but I would try an adapter on the monitor first.

 

I asked a friend of my who is a computer hardware specialist. He suggested that a high-quality shielded VGA cable would be the most economical solution (...certified low-interference AC adapters are much more expensive). Sure enough, no more blur. Thanks for all your help guys.