Power & Sensor Replacement -> not working

Hello,

i just repaired my iPhone 4 with a new Power Button and Sensor cabel as shown in this perfect documentation Remplacement de la nappe d'alimentation et de capteur de l'iPhone 4

The power button and the sensor are still not in function after the change and i kindly ask you if you can give me some support where i need to look or i have take care?

Thank you!