When connected to a laptop on the phone, the touch screen starts to fail?

Question

Electronics

I like to carry my laptop home and to the office, so I bought a universal power supply to lighten the weight. Left the new power supply in the office.
Due to the fact that sometimes I do mobile development, I have to connect my Android phone to my laptop via USB. Or, if necessary, overwrite the files.
I was surprised to find that in the office at the phone, when it is connected to a computer, the touch screen starts to fail. Not in terms of displaying information, but in terms of touch processing. Moreover, the glitches are completely different - either arbitrary clicks occur, then when you click on one point, it works in another place, then it does not react to clicks at all.
There are also two tablets available: one for Android, the other for PlayBook. The picture is the same.
Everything becomes normal when you disconnect the universal power supply from the laptop. There is no such problem with the native block.
I would like to understand the reason for this behavior of mobile devices. What can be wrong?
Unfortunately, it is not possible to connect another universal power supply unit - a laptop from ASUS requires 150W, and on the market, except for Raved, no one offers such power units. Block model RVD-0301, if that helps.

Answer 1

Interference that drives the capacitive screen sensor crazy. It would be necessary to look with an oscilloscope what kind of garbage is pouring from the power supply ...

Answer 2

It happened with a motor boat, if you ground the case (just hold on to the case with one hand), then everything works fine.

Answer 3

It's funny. Most likely it's really about grounding. A potential appears on the case, which is perceived by the projective-capacitive sensor as random touches. For the purity of the experiment, it would be nice to check the resistive sensor - it should work fine.

Answer 4

I saw the same thing yesterday on my Samsung Galaxy Ace. I put it on charge and could not unlock the screen in any way. Charging Chinese with DealExtreme, such universal crap with a USB port.

Answer 5

Try ferrite cable

Answer 6

This happens when a more powerful charger than its own is connected to a phone with USB charging in order to reduce the time to fully charge the battery. Your laptop may be behaving like a too powerful charger.

Answer 7

Hello!
A similar problem when connecting a Samsung Galaxy S to a USB Host Shield connected to an Arduino Mega2560, which in turn is powered by a Chinese power supply purchased from dx.com. Can this be somehow solved by minimally modifying the power supply and how to do it?
The option of shredding the cable to turn off the charging is not yet considered.

Answer 8

The same problem with connecting Philips S398 to an HP laptop (power supply native from HP). And when using the network native charging from Philips, there is no such problem.