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Garmin Edge Circuit Board - Connector removed
Here's the circuit board with that dodgy spring loaded connector thingo removed. Easy enough, just go at it with a sharp knife or a small screwdriver.
Garmin Edge 305 Front/Back connector
This connector between the front and back of the Edge unit is the Achilles heel of the design. If the unit is shaken a lot (as it is on a bike) then these contacts can loose touch just for a split second. When this happens to the one carrying power - that's when your Edge turns off half way through a ride 
How to fix your Garmin Edge
For all those who have an Edge that powers off randomly - this might be something good to try:
http://www.fixya.com/support/t400936-garmin_edge...
There's a nice thread here on how to disassemble the device in the first place:
http://forums.motionbased.com/smf/index.php?topi...
BTW - while we're at it, if your Edge seems completely dead it might not be. If you haven't used it for a while plug in the USB for a while to make sure the battery is not dead then try this:
Wanted ...Garim GPS device.
Looking for a 2nd hand or Garmin Edge 205 or 305 GPS for recording rides. 
Not worried about HR monitor functions.
PM me if you think you have something I might be interested in.
Cheers
Shane