Hi. I have a strange problem: the Bambulab logo lights up only when I turn it on and goes off directly. Attached is a video. What can be done? The cables under the cover are OK.
No is OK, it will be on when the printer begin to print. 
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Thank You. I could have bet that the logo is always illuminated!
Yes, PHIL63 is correct. The Bambu Logo Light goes on briefly when you power up from the main switch and then only when actually printing.
Mine stays on whenever the printer is on, even when idle.
After a print is finished, the logo remains illuminated and only goes out after many hours when the printer remains idle. Only directly after switching on the device the logo does not light up at first - only after starting a print.
So I have now seen it afterwards also in various unpacking videos on YouTube, in which the printer showed the same behavior. So I am reassured.
Same here - have gone a couple of days without printing and logo still illuminates.
As per my other thread, I just wish they would turn off all lights (AMS, Hotend logo) and fans when we hit the power button on the machine itself.
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And directly after turning on the printer?