Question about Garmin StreetPilot 2720 GPS Receiver

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White oval spot in center of screen on garmin 2720 gps

Installed on motorcycle, rode on a damp morning spot appeared in middle of screen changed size as i was riding got more pronounced as i rode after i stopped it went away. rode some more spot started to come back and disappeared before i stopped the motorcycle this is a garmin 2720 gps streetpilot spot was about inch and a half long and about a quarter to 3 inches tall was wondering if it was moisture that caused this look like spot was on the inside of the screen

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The touch screen is made up of several layers. A thin plastic layer, a micro thin metal layer, microdots for insulators, another thin metal layer, and a final plastic layer. All of these layers amount to the thickness of a sheet of paper. This whole stack is bonded to a thin sheet of glass and placed over the actual TFT display.

If the touch screen is still working the moisture probably isn't between the layers. My guess is moisture got through one of the gaskets and made it's way in between the touch screen assembly and the TFT display.

If you want to clean it:
Remove the six screw holding the case together.
Split the cases and pull the patch antenna out of it's slot.
Remove the four silver screws holding the display assembly into the front bezel.
Unhook the small ribbon cable that goes to the infrared receiver under the red lens.
Pull the display assembly out of the front bezel. It won't come all the way out because of cables.
Use a razor to cut the plastic tape holding the touch screen bracket to the TFT display.
Unlatch the 4 conductor ribbon connector nestled between the 2 big white wires.
Use a penknife to unbend the metal tabs keeping the touch screen from coming loose. I usually just do the ones by the IR receiver.

Now that the touch screen is in your hand you can carefully clean the moisture from between the two assemblies. The gaskets are tricky to install again but it can be done, maybe you'll see where they were leaking.

Posted on Jan 24, 2009

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I usually start by installing (or reinstalling) v7.2 firmware and then attempt to recalibrate the screen, sometimes that works. Next I would try re-seating the 4 conductor touch screen pigtail in it's ZIF socket nestled between the big white wires on the display assembly. The last resort is to buy a broken 2600 or 2700 series Garmin and salvage the touch screen. You could send it to Garmin for a flat $250, but that makes no sense at all.

If you get another screen (Garmin won't sell you one), Here's how to replace it:
Remove the six screw holding the case together.
Split the cases and pull the patch antenna out of it's slot.
Remove the four silver screws holding the display assembly into the front bezel.
Unhook the small ribbon cable that goes to the infrared receiver under the red lens.
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Use a razor to cut the plastic tape holding the touch screen bracket to the TFT display.
Unlatch the 4 conductor ribbon from the ZIF connector nestled between the 2 big white wires.
Use a penknife to unbend the metal tabs keeping the touch screen from coming loose. I usually just do the two by the IR receiver.

When you reassemble, don't get frustrated with the gaskets, they're tricky but it can be done. Tom

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