Lenovo Thinkpad Display goes if I connect power adapter?

Hi. I have a Lenovo Thinkpad t430, and that works, when I plug in the power adapter, the display goes off briefly. It then starts again after 5 seconds. And if I disconnect the power supply, then the screen goes off again for 5 seconds, then it goes on again.

I suspect the voltage converter of the motherboard. If the broken, he likes to interrupt the power supply briefly.

A first solution is (according to Lenovo) to reduce the refresh rate in the settings to 50 Hz.

In the long term, however, you should contact Lenovo with this issue.

Ah ok