[knc1]

This seems to be a common failure mode for older K3 devices.

There was recently one poster who was trying to Kubrick the device (without any luck) and they stumbled onto what might hint at the cause (I can't find the link, so will paraphrase):

**Without** stressing the screen, squeeze / flex the case around the edges.
That restored operation for that one poster.

This hints at a possible manufacturing problem, way back when - -
If the manufacturing process is not exactly right, the solder connections of BGA parts can "age" - I.E: crack.

The major parts of the hardware system on the mother board are BGA mounted parts.

I am not the first to have this insight, a (couple?) few years ago, a poster came to the same conclusion - and tried to "reseat" the BGA parts by heat-soaking them in a toaster oven (actually a recognized repair procedure).

That poster did not have any luck with that trial.
But there are a lot of things that can go wrong when you heat-soak a motherboard (not the case, not the screen).

= = = =

You might just have to consider these Kindles dead or spare parts.