1 - 2 hours
The lock button was not working so I had to replace this Lock button cable.
I successfully replaced this cable and not this part of the repair is complete.
In te process of installing this cable, I tore the iPhone 4 Headphone Jack & Volume Control Cable (GSM/AT&T). My proble was I had the tweezers the repaid guide suggested and applied too much force because I didn't have a good grip on the headphone jack. I ended up tearing the cable and now I have a new cable on order because the headphone jack, volume buttons, and vibrate buttons do not work as a result.