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Typically, the Garmin GPSes are in a welded case to make them watertight. If you got the back off, that means yours is an older model with an o-ring seal and you CAN access it? Lucky you!
With those kind of screens, they are usually connected to the guts by a ribbon cable OR edge contacts, and if the contacts are disrupted that's all it takes to blank the screen.
It could also easily be a circuit board cracked when you dropped it, and that's also easy to repair, you need to eyeball the circuit board very carefully, especially near corners or mounting posts, to see if there are any hairline cracks or cold solder joints that opened up in the fall.
Bright light and reading/magnifying glass are essential unless you've got exceptional eyes.
Last edited by hellosailor; 05-09-2010 at 02:31 PM.