SOURCE: Screen Calibration problem with SteetPilot c330
Turn off the unit. Then hold down the power button for about 1 minute and the calibration screen will eventually come up.
SOURCE: touch screen won't calibrate on garmin 2720 gps
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
SOURCE: touch pad seem to be out of calibration - when you
not sure what tom tom you have but try this (found in a forum)
SAW THIS IN ANOTHER FORUM - RESOLUTION TO SCREEN CALIBRATION ISSUE
So I will give it a try to help sort out a friends TomTom.
Method valid for NavCore versions until 8.051.
A manual method to correct the calibration of the touchscreen input
device of any all-in-one TomTom systems consists in creating a file
called calib.txt (e.g., with notepad) and saving it in the main
directory of the TomTom disk memory (e.g., the SD card; the same
directory of the ttsystem file).
calib.txt should include one line with four numbers separated by a space: MaxX MinX MinY MaxY
Notice that the ‘x’ sequence (max, min) is inverted than the ‘y’ sequence (min, max). MaxX > MinX and MinY < MaxY.
For instance, the file can include:
928 118 107 912
Each TomTom device has its own most appropriate sequence.
In order to compile the file with default data, one method could be to
perform a TomTom reset (or to eject the SD card), powering on the
device and holding down the ON button for a few seconds until a unit
status screen appears. The line named “Touchscreen calib. data:” will
include four numbers that in sequence represent MinX MaxX MinY MaxY;
these numbers can be used to fill the configuration line of calib.txt
remembering to swap the first two ones. For example, if the unit status
screen returns 118 928 107 912, calib.txt has to be saved with 928 118
107 912.
Tuning can then be done by adjusting these numbers until the
touchscreen is calibrated. Distortions like screen rotation, trapezium
and rhombus correction cannot be achieved with this method even if
tuning these parameters can provide an acceptable touchscreen
management even in presence of distortions; the best screen to tune the
calibration is exploiting the soft keyboard of the NavCore application.
For instance, in my old TomTom GO Classic device I realized that, after
activating the NavCore soft keyboard, when moving vertically (Y axis)
the cursor appeared calibrated, while the horizontal movements (X axis)
prevented to manage the left and right key columns (especially in the
left bottom corner positions). So, I left the last two digits unaltered
and, after some tests, I successfully used the following values: 805
200 107 912.
Method valid for NavCore versions post 8.051.
For NavCore versions 8.2x and 8.3x, use the same method as mentioned above, with these small differences:
the file should be named cal.txt (and not calib.txt) and should again
be positioned in the main directory of the SD (or HD) drive of the
TomTom system (e.g., the same directory where ttsystem can be found).
Besides, the four numbers included in the file should have a different
sequence than what previously described for versions until 8.51;
cal.txt shall include the following sequence: MaxX MinX MaxY MinY
(notice that also MaxY precedes MinY).
For instance, cal.txt could include the following four digits: 928 118 912 107
Again, these numbers are specific of each TomTom single unit.
E.g., my TomTom GO Classic correctly runs 840 245 912 107.
SOURCE: Re-calibrate Screen on Tom Tom One Regional
I tried this to fix my tomtom one, but it didn't work.
It may be worth a try on other models, though....
http://www.yournav.com/forum/index.php?showtopic=12622
SOURCE: my garmin 255w's touch screen is messed up
There are three ways to fix it
Recalibrate
remove face cover and use the reset button or the sequence from the manual to reset factory settings
Finally.... send to Garmin
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