iPad 4 Wi-Fi Teardown

ID: 11462

Description: We got our hands on the fourth generation of...

Steps:

  1. Welcome, ladies and gentlemen.
  2. Apple has stunned the tech world once again. A mere 7 months after the announcement of the iPad 3, the iPad 4 was introduced on October 23, 2012.
  3. Tech Specs:
  4. Dual-core A6X processor with quad-core GPU
  5. 9.7 inch LCD, backlit in-plane switching LED with 2048×1536 pixel Retina display
  6. 16, 32, or 64 GB flash memory (at launch)
  7. 5 MP rear-facing camera
  8. Lightning connector
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  9. One of the major differences between the 3rd and 4th generation iPads is the connector. The 3rd gen (top) has the 30-pin dock connector, while the 4th gen (bottom) has the Lightning connector.
  10. The iPad 4 has a new model number, A1458.
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  11. Continuing the trend, this iPad is glued shut. This isn't our first adhesive-riddled iPad, and we've been working to figure out how to make the painful opening process a lot easier.
  12. Our heated-up iOpener lets us apply heat just where it's needed, softening the troublesome adhesive. Once we've snuck a few guitar picks in the seam, we're nearly home-free.
  13. We're happy to report that no iPads were cracked in the creation of this teardown. We haven't always been so fortunate.
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  14. With the adhesive out of the way, we open up the iPad.
  15. As expected, this stage looks no different from the previous generation.
  16. Now that the hard part is out of the way, it's time for a break with a hot cup of drinking chocolate.
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  17. As opposed to the Samsung display we found in the iPad 3, the new iPad LCD is manufactured by LG.
  18. Apple has reportedly been working to move away from Samsung as a primary supplier, so this LG display is not surprising. However, Apple often relies on multiple suppliers for a single component, meaning there are quite likely other LCD manufacturers lurking inside other iPad 4s.
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  19. Continuing to examine differences in the LCD cables…
  20. Well, Apple used a different color Sharpie.
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  21. We lift up the LCD to reveal the battery.
  22. The battery is labeled with the same model number (A1389) as in the last round, so it's no surprise that it's another 3.7 V, 43 Whr package.
  23. Like the iPad 3, the battery is adhered very securely to the rear case. Since batteries are consumables that wear out, the trend of glued-in, hard-to-access batteries in iPads and other Apple devices is unfortunate.
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  24. Skipping ahead to the good stuff, we get a quick look at the biggest improvement in the iPad 4—the A6X and its supporting hardware:
  25. Apple A6X Processor
  26. SK Hynix H2JTDG8UD2MBR 16 GB NAND Flash
  27. Apple 338S1116 Cirrus Logic Audio Codec
  28. 343S0622-A1 Dialog Semi PMIC
  29. Apple 338S1077 Cirrus Logic Class D Audio Amplifier
  30. QVP TI 261 A9P2 Boost Converter (likely)
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  31. The backside of the board, however, boasts no dramatic improvements:
  32. Broadcom BCM5974 Touch Screen Controller
  33. Broadcom BCM5973A1 Touch Screen Controller
  34. Texas Instruments CD3240B0 Touch Screen Line Driver
  35. 2 x 4Gb Elpida LP DDR2 = 1 GB DRAM in separate packages in a 64-bit configuration
  36. 2 x Fairchild BCHAH/FDMC Voltage Regulator / Reference
  37. Murata 339S0171 Broadcom BCM4334 WiFi Module
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  38. Apple didn't save any space by switching to the smaller Lightning connector (lower); rather they let the Lightning cable sit in a frame the same size as the 30-pin dock connector (upper).
  39. We were hoping that space savings would yield bigger, better speakers. Very disappointing, indeed.
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  40. If you're new to our site, we'll let you in on a little secret: we love our 54 Bit Driver Kit. It makes quick work freeing the Lightning connector, even with a couple of hard to find screws.
  41. There is a bit of adhesive holding the connector in, but nothing compared to some adhered components we've seen before.
  42. Repair techs, DIY-ers, and clumsy iPad-users, rejoice! The Lightning connector is on its very own ribbon cable, meaning that procuring a replacement connector should be fairly inexpensive.
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  43. Despite looking almost identical in this shot, we do spot one more difference between the 3rd (top) and 4th (bottom) generations: the front-facing camera!
  44. We've got a 1.2MP FaceTime HD camera, with the ability to shoot 720p HD video. That's a big improvement from the .3MP FaceTime camera in the iPad 3.
  45. Compared to the iPad 3, this camera is actually slightly thicker (an extra .4 mm), but it still manages to fit into the same space.
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  46. iPad 4 Repairability Score: 2 out of 10 (10 is easiest to repair)
  47. The LCD is easy to remove once the front panel is gone.
  48. The battery is not soldered to the logic board, making the replacement process a tad less difficult.
  49. Just like in the iPad 2 & 3, the front panel is glued to the rest of the device, greatly increasing the chances of cracking the glass when trying to remove it.
  50. Gobs, gobs, and gobs of adhesive hold everything in place, including the prone-to-start-a-fire-if-punctured battery.
  51. The LCD has foam sticky tape adhering it to the front panel, increasing chances of it being shattered during disassembly.
  52. You can't access the front panel's connector until you remove the LCD.
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