I few months ago, i have a battery problema. It stuffed and pull off the botton and the screen.
I manage to find the battery (AP00069) and sucessfuly change it. The watch recharge properly and when I turned it on, I can hear the sounds of messages coming, and vibration when it does, but no image whatsoever. I tried to disassemble it again, and check more carefully the flat cable connector between the screen and the motherboard. I did this 5 times, and everytime is the same.. no image, only sound and vibration. I dont know if thereis something Ive missing, a ground point, or if can be the battery theres no enough energy to suply everything (I dont even know if this could happen). But the question is, theres some test or check I can do before try to boy a new screen (if I can find one of course).