On the board itself wouldn't there be a potentiometer to adjust LCD contrast?

On the board itself wouldn't there be a potentiometer to adjust LCD contrast?

There is a tiny hole in the housing. Who knows where it may lead. I'm tempted, but it's a new device, it just needs to work. See below :)
https://poal.co/s/Repair/797284/11943672-3f86-4e58-904c-d3dede2acc87#cmnts
There is a tiny hole in the housing. Who knows where it may lead.
I'm tempted, but it's a new device, it just needs to work. See below :)
https://poal.co/s/Repair/797284/11943672-3f86-4e58-904c-d3dede2acc87#cmnts
(post is archived)