Question about Garmin Nuvi 660 GPS Receiver
My touch screen lost functionality. It started out with a wandering calibration. That lasted several weeks but I could recalibrate. But now no function at all! I tried the master reset but same deal once powered up. Makes a great paper weight though!
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Posted on Jan 02, 2017
The touch screen is a 4 wire resistive type made up of several layers. A thin plastic layer, a micro thin metal layer, microdots for insulators, another ultra 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.
It's amazing that you can see through all these layers and only lose 20% of the light. What's not so amazing is that those thin metal layers are prone to damage. I've seen several with no apparent damage that didn't work, and several with visible scratches or cuts that worked fine.
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.
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 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
Posted on Jan 24, 2009
SOURCE: Nuvi 680 touch screen problems
If you keep holding the button down it will go past the pre-boot mode and you'll eventually come to the calibration screen. Please see this link for more info:
Also see this link on how to het your touchscreen replaced:
Posted on Jul 13, 2009
Recalibration has nothing to do with repairing this problem. If the touchscreen is non-responsive, how are you going to recalibrate it when it doesn't recognize the key presses?
The problem is caused by a defective touchscreen. SHARP substitued a different touchscreen into the 6xx series that fails even when the glass isn't damaged. The problem is caused by a defect in the manufacturing process where the touchscreen connections becomes detached from the tail that plugs into the board.
The touchscreen connections between the screen and the tail are made from conductive ink that can fracture, most likely caused when pressing on the screen over time.
These defective screens can be identified by a white tail cap at the end of the tail, whereas the original touchscreens have a maroon tail cap. The original touchscreens will only fail if the glass has been broken.
I only use the original touchscreens for all of my repairs.
Posted on Nov 25, 2009
You should check if a screen protection film is still on. If so remove it.
Next is to calibrate your screen following Garmin procedure
Turn off device.
Press top left corner of device an hold.
Turn on while holding pressure, once device starts, release start, but still hold the pressure for 10 seconds until a screen is appearing with "press dot"
Posted on Sep 26, 2010
Tips for a great answer:
Jan 09, 2013 | LG KC910 Renoir Cell Phone
There is a radio option to recalibrate your touch screen. Please press the following three hard keys simultaneously RADIO/MEDIA, SEEK UP, NAV (AUDIO on REN). Once you begin to recalibrate the touch screen you must finish. Audio confirmation prompts are provided for each of the three points of calibration, one beep for the first, two for the second and three for the third. The calibration needs to be precise as possible and a PDA stylus would be recommended. The MyGIG radio requires the user to repress each calibration point to confirm the calibration process. A green crosshair indicates proper calibration.You must not start with the "+" but with the "+1", then goto "+2" and last to "+". Repeat this until all crosses are green and exit with pushing the menue or any other key. Done
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