Tom Cebulski (Unregistered Guest)
Posted From: 18.104.22.168
|Posted on Monday, October 04, 2010 - 12:35 am: |
I have a question about renaming the files GUPDATE.GCD" to "GUPDATE.OLD in order to make the touch screen start working. I have 2 gamin nuvi 650s and the touchscreen is unresponsive in both.
I tried renaming the file,GUPDATE.GCD" to "GUPDATE.OLD, and only one of the garmins brought me to the recalibration screen and started working again. The other still does not work, so I will have to send it in for repair.
1) Does renaming GUPDATE.GCD" to "GUPDATE.OLD, and then again to GUPDATE.GCD, permantly repair the touchscreen? or will it start to become unresponsive again?
2) Why does this problem occur and then is easily fixed?
|Posted on Monday, October 04, 2010 - 08:22 am: |
Renaming the file is not an automatic cure to "fix" a touchscreen. The procedure only allows you to reach the calibration screen, so that you can try to recalibrate it.
First, When a unit comes from the factory, the touchscreen is already calibrated.
What does "calibrated" mean?
Calibrated means that the Nuvi has been told where the outer bounderies of the screen are by pressing the dots on the calibration screen. Each dot represents a x/y coordinate and each key press is stored in non-volatile RAM, meaning it won't be erased when the unit is turned off.
The GUPDATE.GCD file is a file that's loaded onto your Nuvi whenever you are updating your unit's firmware with Garmin's WebUpdater. Your Nuvi uses this file to upload the system firmware into your Nuvi's internal memory. It's essentially the operating system. Once it's been uploaded, you won't need it again and the file can be erased. However, I prefer not to erase it (more about that later).
When you hold down the power button, if your unit has the GUPDATE.GCD file, it will try to re-upload your system's firmware from the file into the internal memory. This is very useful if for some reason, your unit's internal memory has become corrupted and isn't working right. This is why I recommend not to erase it. You may need it again in the future, should the internal memory become corrupted.
By renaming the file from GUPDATE.GCD to GUPDATE.OLD, your Nuvi will not try to reload the system firmware (because it can't find it, due to the renamed filename) and will then access the touchscreen calibration screen.
If you try to press the dots and nothing is happening, then your touchscreen is NON-RESPONSIVE and it needs to be replaced.
If you have a touchscreen that does respond to the dots when pressed, you may be able to recalibrate it.
However, my question is.... why did the touchscreen lose its calibration in the first place?
It's because the touchscreen is still defective and has drifted in its resistance values and is the first sign that it is going bad.
You will find that once you recalibrate it, a short time later it will lose calibration again. You may have to repeat the calibration procedure several times before it will no longer respond to keypresses.
In either case, the long-term solution is to replace the touchscreen.