1 - 2 horas
iPhone 4 power button not working.
The repair went smoothly by printing out the parts template and using it to make sure the very tiny screws got back into the correct locations. By reading other peoples comments I made sure to transfer the small adhesive seals from the old flex cable to the new one. The phone works like brand new.
Read the comments and learn from others experience and use the iFixit guides. I would rate replacing the power and sensor cable as a difficult repair. If you don't have patience, good eyes and steady hand then pay a professional.