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Why a "shadow" effect on an LCD monitor? Answered

I have two Acer 24" LCD monitors for my laptop, one at home and one at the office.  The office monitor sometimes shows a dark 'shadow' effect to the right of both text and graphics.  The home monitor is fine so it can't be the computer.  Any ideas as to what's causing it, and whether it can be fixed?


VGA is an analog technology, making it susceptible to electromagnetic interference and signal losses.  The cable on your office computer might either be too long, not shielded heavily enough, or running parallel to power cables or near some source of interference.  Solutions include purchasing a (more expensive) heavier cable that is as short as possible, and then playing with the positioning of the cable so the ghosting disappears.

If you cannot avoid placing the cable near other cables, try not to run it parallel to those cables; instead, placing them perpendicular to each other minimizes interference as it causes phase cancellation and there will be less length where the interference can "jump" from one cord to the next.

That sounds like a reasonable solution.  I will play around with the video cable.  Thanks!

This works! Am so happy I didn't spend hours looking as this was the first site I linked to.


2 years ago

the answer was technically answered xD, but in fact the name of the issue is line shadowing to be precise, the sheer intensity of neerby wires was overriding the signal of the main wire, witch by the way is supremely dangerous to the hardware - "wrong signals" could come in by the thousands in a very short period of time, sending commands that the device will partially except etc, ive had tv monitors and crt screens EXPLODE and do all kinds of wonky lethal behavior.

asa rule of thumb any wire over 3 mm in thickness of the core needs to be at least 3 inches from any other neerby wire away through the length of the whole wire

also to you wouldbe or N00bie electrical ingineers out there, be sure that your wire is THICK enough to properly relay the voltage OR the data going through the wire,vor every 1 ohm @ 1 volt exactly (they are always equal in terms of need) u need .5 millimeters of thickness on the wire for TRUE throughput.

P.S. copper has one more ring for open electron gates then does gold, and has BETTER reception than gold does, thought gold tips are good because gold doesnt rust in open air - and nickel copper semi-composites area great alternateive for gold tipping.


2 years ago

I had the same problem. Turned out it was the VGA cable I purchased a 10' long cable from ebay and for whatever reason it caused the shadowing problem. I replaced the cable, problem resolved. Hope this helps


8 years ago

sounds like a burn in look it up on google.

What operating system are you running?

Vista.  I can't see how the operating system---or for that matter, anything about the computer---would make a difference, considering that one monitor works fine and the other (identical make and model) does not.  But maybe I'm wrong...

If its on in one computer and off in another, its not the monitor. There are bound to be some settings somewhere on the computer or monitor that will turn it on or off.

It is the same *computer*, connected to one (external) monitor at home, and an identical (external) monitor at the office.  The laptop's built-in screen is used only when I'm traveling.