The Technician notes:
There are a several major hardware updates and design changes in the new 4th Generation iPod Nano.  The lens over the LCD is now glass instead of plastic, and instead of being glued in place, it is held by a recess inside the case and pressure from the LCD screen.  The design of the parts inside and how they connect has been changed.  The CW, LCD and hold switch interconnects are easily damaged, especially without experience servicing the unit.  If you plan on working on this unit yourself, make sure you are extra careful during the disassembly process!

The Technician states:
It seems as if Apple cannot decide on a design for the iPod Nano.  They have done away with the shorter, wider 3rd Generation “Nano Fatty” in favor of the 2nd Generation form factor, but with a “fish-shaped” top view.  They have kept the 3rd gen video capability alive with the addition of the tilt feature, so you can turn the unit to its side to watch video.  While the outside may look like a revision of an earlier iPod Nano model, the inside has been completely revamped.  Apple changed the chips used, the features offered, and layout of the parts.  The layout of the hardware seems to be an almost overt attempt to make the 4th Gen Nano nearly impossible to service without the experience of a professional.  Overall, it looks like a cool new unit, that is very different from its predecessors and Apple is showing that it really hasn’t found a design they love enough to stick with.

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Prepare

Tools required:

• Small Phillips Screw Driver
• Small Flathead or exacto razor
• Safe Open Tool
• Repair Toolkit available HERE

Gather all neccesary tools and place your iPod Nano 4G on a clean flat surface, use a soft cloth or towel to place under it.