Static electricity Macbook or?

Question

macbook

Hello dear.
The problem is this. When connecting a Macbook pro retina 13 late 2013 to a TV via hdmi or thunderbolt, at the moment when you touch the case with the cable plug, there are small sparks (quite microscopic). Further, I noticed that this only happens when the macbook is connected to the network. If you turn it off from charging - all the rules. There are no problems with other devices either - an external or USB hub with external power is connected normally. When I have already plugged in hdmi, everything also disappears, then it works fine, even though it was connected to the TV set for the whole day. These sparks appear when you just bring the cord to the connector. I also noticed that if you take the included cord from charging the laptop in one hand, and the hdmi cable in the other, it feels like it is shocking, not much. What could be the problem and is it a problem? How dangerous is this for a laptop? The service center didn't say anything. Thanks in advance!

Answer 1

Static electricity involves the gradual accumulation of charge. Thus, after the spark jumps, the charges will equalize, and a second spark can occur after a certain period of re-charge accumulation. I understand that this is not your case.
In your case, in my opinion, there is voltage (alternating) between the charger and the HDMI cable. You can verify this with a multimeter (be careful).
Possible reasons:
1) counterfeit charging.
2) self-made "ground" inside the charger (an AC voltage divider of two capacitors), and / or the same circuit in the TV. In this case, flipping the fork can help.
3) various variations of point 2), multiplied by the possible nuances of the power supply. Try plugging your laptop charger into the same power strip as the TV. Fork may need to be reversed.

How dangerous is this for a laptop?

It's hard to say, but generally speaking, the situation, as I understand it, is abnormal.
I had a similar situation at the time of the local network on a thin coaxial cable, there were small sparks between the metal connector (BNC-T) and the computer case. Then I did not understand what was the matter, the network worked for six months without any problems.

Answer 2

Friends, thanks for the answers! I have now left for another city for a long time and tried to connect the poppy to a similar TV set here. Bought a new cable. I turned on the poppy and started connecting it (both power cords were plugged into the same outlet) - everything is normal, nothing sparks! It turns out that the problem is either in my telly or in my wiring. Although neither here nor at my house there is no grounding. I used to connect both a curling iron and a macbook air - there was no such problem, but there is a firmware) but in general, okay - I'll try to change the cable at home or something, but for now I won't connect it)

Answer 3

You can try to make grounding on the charging socket, and if caoxyl comes up to the TV, then it is also probably grounded, and I think it grounds the TV set. As a minimum, it would be worth equalizing these potentials by connecting the braid of the TV cable and the charging ground contact, or, well, to make a common ground (grounding).