[T430s] Small ripple on external monitor when power adapter plugged in

If I unplug adapter, external monitor picture is fine. But if it is plugged in, I can see small ripples on the screen.
How can I fix it?
Thank you.

Yes, the charging stops but the battery goes into a state that never discharges, which interferes with its life. This is what the Apple support said. Actually several of them confirmed that having it plugged in all the times will affect the battery life. They said to unplug it and let it discharge completely once a week to allow a full cycle to cycle to occur.
As you can tell, there is mixed information. They say one thing in an article and another on the phone. There is also a lot of opinion. The complete understanding will happen only when time passes with the computer constantly plugged in.
I speak from experience of having my older Macbook Pro plugged in for 7 years. I got the same story from Apple (battery stops charging - no harm done) Right. The battery overheats, it bulges, it presses on the chips inside and the mac goes crazy. Also the battery life goes down to only about 20 minutes after a year of being plugged in. This new Macbook Pro may have a better battery technology and electronics but they were saying the same thing back than. The difference was that with the old Macbook Pro my battery replacement cost me $60 and it took me 10 seconds to exchange it. This time battery replacement will cost me $200 and will have to part with the computer for 4 days to have it replaced. And how often will I have to do that? I guess I will follow up on this discussion in a year to let you know the outcome.
I hope I was clear in expressing my concern.

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http://DingDingMusic.com/Manuals/
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[T430s] Small ripple on external monitor when power adapter plugged in

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