Satellite L650-12Z: Led does not light up when connected to power source

My L650 does not show the white light anymore when the cable is plugged in.
The connectors are clean, and the adapter is working.
The laptop does still run on the battery ( when there was still power in it).
Also without the battery, there is no white light indicating that the laptop is connected to the DC.
Does anyone know what the problem could be and how to solve it?

Thanks for your reply.
Unfortunately the battery does not charge when connected.
Only when connected with the full battery it is working.
I have measured the adapter with my multimeter and it seems to be working properly.
Like you said, letting a technician look at it would be a smart idea.
I decided to send it to a service center in my city, in about 4 weeks I would have the notebook back they said.
Weird thing for me still is, that around three weeks ago the same happened. Windows said the power was not connected. But after plugging the power in and out a few times it worked again. Maybe this is a symptom of something?

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Satellite L650-12Z: Led does not light up when connected to power source

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