Why does the laptop charge or not?

Question

laptops

Hello.
Charging on a laptop that is, it is not. They took it to the repair, they changed the cable that goes from the adapter to the socket on the laptop, but after that it worked for less than a week and the problem returned. At the same time, when the power is connected, but the laptop is not charging, the light on the laptop case (it lights up when the laptop is charging) flashes red. Although it should turn red when the battery drops to 15% (the current charge is 40%, but the light is red). But when the cable is pulled out of the socket, this light stops flashing and lights up in white. Those. we can conclude that when the cable is connected, but there is no power, the laptop "understands" that the charging seems to be connected, but it does not charge.
I read on the Internet that people with a similar situation had a problem with the adapter itself. Maybe that's how it is with me?
Notebook Lenovo G580. Bought 4 years ago. Nothing was ever changed until it broke.

Answer 1

I read on the Internet that people with a similar situation had a problem with the adapter itself. Maybe that's how it is with me?

Maybe. Try a different adapter to check.
It happens - a "shitty" adapter does not charge the switched on laptop, but it charges the switched off (sleeping)