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Hello. I changed the back housing for iPad 4 Wifi version. But I accidentally I poked the long Volume Headphone Audio Headset Jack cable. And now the iPad is dead! Is it really because I poked this cable exactly ? Could it be ?! I mean I did every thing in order as the video told me ! Could the logic board be dead for that mentioned cable is little damaged ? Update (03/21/2017) You don’t know how grateful you’re here for help -Minho, Thanks. I actually disassembled and reassembled my Apple iPad 4 Wifi version and put it in a new back housing cover because the old cover was damaged by the edges in it. So I dis-attached the adhesives with a heating gun on 200 degree Celsius for few seconds to take battery and other glued cables off. And this is picture of the headphone cable I accidentally damaged, in the area where your screw goes in so assemble the headphone cable. Update (03/21/2017)

Update (03/21/2017) I also looked back at the old housing cover or box. I noticed that I cut the cable that connected to the head phone jack. can you please advise me about what cable I will buy next. (other than the headphone jack) I added the last picture. here IT’S DOWN THE CAMERA and I don’t think that this is the same headphone jack cable. So which one is this please ?

Do you mean this? What exactly do you mean by “poked”? These flex cables have a high density of copper traces running through them. If you poked or damaged it, you could cut an important trace or short a voltage rail to ground. The good news is you can order a new one and replace it.