Screen flickering while charging

[Jeremypats]

I recently replaced the screen and flex cable on my A52 device. I have noticed that when charging from a 230VAC wall socket, the screen flickers to such a point that the phone is unusable. It still charges but I just cannot use it as it is charging. I have tried different chargers and the behaviour is the same.

When charging from a pc (5VDC) or in the car (12VDC), the screen works perfectly.

What could be the matter?

[NotAdmin]

Did you replace it yourself or had an official samsung repair shop do it?

[Jeremypats]

Where I stay, there is no official Samsung repair shop. They left the city ages ago.

I sought the services of a renowned technician.

What is interesting is that it only flickers when in a certain position, eg when facing up on a table or when held at a 45 degree angle.