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GSM version of the fourth generation of iPad released November 2, 2012. Model Number A1459 / 16, 32, or 64 GB

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iPad 4 Digitizer Does not recognize touch..!

Just finished replacing the Digitiser on my iPad 4. Everything went well, the shattered glass took a long time to deal with but I got it all off and cleaned out. Replaced the digitiser screen with one that had a new home button and camera guard so didn't have to deal with that. I put it together all the way except for actually adhering it to the base.. Turned it on but can't get any further because it won't recognize touch. The home button work fine. I did pull it all apart and checked the cable and connection (even used a magnifying glass) all looks well to me. Reseated the cable and put it together again and powered up... Same issue..

Does the digitiser need to be locked in place before it will work? I don't really think so but reaching for straws at this point..

Any help would be greatly appreciated.

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1 Answer

Hi fjmaughan,

I have found that on ipad 2/3/4, if you dont disconnect the battery during the digitizer replacement, then it will often 'fry' the new digitizer. I'm not sure why it does this. Although it could also be a defective digitizer you received. The way I avoid this issue is to take out the top 2 or 3 screws on the motherboard and wedge something underneath the board to disconnect it from the battery BEFORE I disconnect or re-connect any cables. After your new digi and your LCD are hooked up, then you can screw the board back down. Also always make sure to turn the ipad off before doing anything to it. You'll probably need to get ahead and order another screen.

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I have never heard of that one before. I've done many an iPad 2,3 or 4 without disconnecting the battery and never fried the digitizer. It is more likely that the OP has a defective part or damaged the cable during installation.

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I appreciate any and all feedback - but I would think if disconnecting the battery was a requirement that the "ifixit" crew would amend the instructions and/or guide. I did ensure the iPad was off before starting the procedure and was very careful with the cables. I was a Communication Tech in the Army for 22 years and have been a DoD contractor working with all types of Spectrum Dependent comms devices so I am very aware of cabling and how important handling them carefully is. My gut tells me I have a bad Digitiser.

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Thanks Brian.. I have verified that the cables and connectors are both in good shape with nothing shorting them and none of the small gold "teeth" are missing.. Starting to narrow things down for me..

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Jim Maughan will be eternally grateful.
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