Tips: Nokia N8 Teardown (Part 3)

Nokia N8 Teardown 

PART 13









After removing the screws and popping off the antenna, the mid-plane can be removed from the N8.

The design of the steel mid-plane is pretty genius. Nokia integrated a large EMI shield into the mid-plane to protect the main chips. In addition, thermal pads were placed on the inner face of the mid-plane to conduct heat away from the main chips.


As processor speeds increase and devices become more integrated, the need for thermal management becomes critical to ensure longevity and operability in many environments.


PART 14








After the mid-plane is removed, the motherboard can be simply lifted out of the rear case.

The daughter board at the top of the motherboard has an interesting design in that it is connected to the main motherboard via a ribbon cable that is sandwiched between the many layers of the motherboard.



On most devices, ribbon cables are attached with ZIF connectors or are soldered to the surface of the board, not sandwiched between layers.


PART 15










HERE IS THE Nokia N8 motherboard:

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Toshiba THGBM1G7D4FBA13 K23538 (16 GB Internal Memory)
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Samsung K5W4G2GACA - AL54 (CPU + DDR RAM + NAND ROM)
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Broadcom BCM2727 GPU with dedicated 3D Graphics
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4380044 9920Q VJ (RF Transceiver)
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EPCOS D1053 (RF Front end module)
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RENESAS 09801A (RF Power amplifier)
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4376057 GAZ0035G (Baseband)




PART 16






With the motherboard out of the rear case, the flash unit simply lifts out.


As opposed to many other smartphones that use either a single or double LED for the flash, the N8 uses a Xenon flash tube similar to the kind of flash found in full-size cameras.


The large capacitor on the flash module supplies the high voltage necessary to produce such a brilliant flash.



PART 17






The loudspeaker can be pried off the adhesive securing it to the rear case at this point.



This loudspeaker is primarily used for speaker phone as well as for playing audio from media stored on the phone.



PART 18


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Nokia N8 Repairability: 8 out of 10 (10 is easiest to repair)
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The battery, although considered by Nokia not to be user-serviceable, can be easily removed.
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The AMOLED display easily comes apart from the glass, which means that you can replace the glass and the display independently.
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There are mostly mechanical fasteners, and very little glue inside.
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You still have to use a heat gun to remove the front glass, but at least you're heating up metal that won't deform as easily as plastic.
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You can't remove either of the cameras from the phone.