Will take a detailed look at your photos after I zoom into them, but in the meantime, can you confirm this is a A7750 with fully functional chronograph? If so, your chronograph reset hammer is not reset in your photos.
I will copy your photos, and label them to help you identify the areas of the movement I'm referring to my friend.
Couple of observations..
01 by Micky Aldridge, on Flickr
Below is how your reset hammer position should be..
7750 reset hammer position by Micky Aldridge, on Flickr
02 by Micky Aldridge, on Flickr
Your minute counter jumper looks trapped under your balance, usually a result of balance being refitted following removal by inexperienced repairer.
Minute Counter Jumper by Micky Aldridge, on Flickr
Still looking at your photos, your movement claps and screws are still in place. I will update you shortly.
03 by Micky Aldridge, on Flickr
Here's A photo showing the correct position for your minute counter jumper.
Swiss ETA 7750 Movement by Micky Aldridge, on Flickr