I add a new issue to the list, for my T440s
I have this problem with the lid, that if i move it around a certain angulation (let's say a bit under 90°) the display starts blinking until i move it a little and then the screen goes locked.
I think it's due to the lid sensor.
(In the maintenance book i'm not able to find any information on this sensor)
I think your symptoms point to a bad cable or loose connection. I would start by downloading HMM and finding repair videos and see how monitor data and power cable are connected.
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