Determine the cause of the appearance of artifacts on the laptop screen?

Question

Monitors

Artifacts appeared at the bottom of the laptop screen. Purple pixels appear literally for 10+- seconds, after which they disappear, leaving a strip at the bottom of the screen that changes depending on the background image. After a reboot everything works fine. This is the second time this has happened. The last time was a couple of weeks ago. There is no overheating.
Lenovo IdeaPad 500 laptop
GPU: NVIDIA GeForce MX150
CPU: Intel Core i7 8550U
The first screenshot is a fit;
The second is a bar at the bottom of the screen.

Answer 1

If there are artifacts when taking a screenshot (not a photo, but a screen by software), then this is a video driver. If not, then the matrix \ loop \ vidyaha. Probability 90%

Answer 2

This is 90% the matrix is ​​dying, 10% may be a bad cable contact in the matrix connector. Or all at once. And, it could also be that the train itself has frayed.
If your hands grow from the right place, you can disassemble, disconnect the battery, disassemble the cover of the laptop, remove the matrix and look (plug the cable into the connector), or throw in a known-good compatible matrix. The loop is more difficult to diagnose, it often happens that when it is moved, the interference changes, but sometimes it is very buggy, and you start looking - everything is fine and you can’t find it in any way. So it's easier to immediately put a new one.
But the best thing is the service. They also have matrices to throw in, and they will find the cable for verification, and if they are not too lazy, even the old one will be restored when the cable is in short supply and a replacement is not easy to find. But wangyu - everything will end with the replacement of the matrix.