After disassembling another problem screen

Good afternoon.

I acquired an Apple Watch 2, which has the screen with a diagonal break / cut. When I tried the touch did not work well (not much could be done, as it was not necessary), the screen showed image and when pressing the buttons Siri speaks extremely fast and weird. I thought that the failure of Siri to speak extremely quickly could be because the touch was broken because of the blow that took the screen glass and I proposed to disassemble the screen and connect all the cables of this, except the central , which comes from the touch glass, to check the reaction of the voice heard when you enter the menu, etc.

To my surprise, when I start the Watch, the screen is seen correctly until the apple, after about a minute of loading, the apple disappears and the menu is not shown. If I press any button you can hear Siri speaking just as quickly and strangely but you can't see anything on the screen.

Could you tell me why you can't see anything after the apple? And another important detail, why does Siri speak so weird?

I ask these questions because I would not like to acquire a screen and that these errors did not disappear.

Thank you.