The ohms reading should not fall away - have you good battery in meter?
Result should be the same as touching probes together.
"Also, when i move the main board it makes strange sounds, like if some small metal object would move around inside, i can't really locate where it comes from."
That is exactly what it is

The screen can be turned from landscape to portrait and the little ball switches the picture.
Suggest you read these to threads if you have not done already
https://www.badcaps.net/forum/showth...ghlight=2693HM
https://www.badcaps.net/forum/showth...ghlight=2693HM
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