Screen re-calibration?

Discussion in 'System Configuration and Customization' started by Niranjan HEWA JULIGE, Mar 11, 2013.

  1. Niranjan HEWA JULIGE

    canderson Moderator

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    Since your firmware is prior to v8.051, you will need to create a file called calib.txt (not cal.txt, which applies only to 8.051 and beyond).
    Also, since you are pre-8.051, your data format should be MaxX MinX MinY MaxY and it appears to be so.
    So you've got the right file and the right format. Now you're down to the tricky part:

    If your up/down is OK, then leave the Y value alone, and focus on "X". With the following in mind, you may need to increase either MinX or increase both MinX and MaxX.

    MaxX Affects the LEFT edge of the screen
    Increase MaxX = Touch point moves further to the RIGHT of where touched
    Decrease MaxX = Touch point moves further to the LEFT of where touched

    MinX Affects the RIGHT edge of the screen
    Increase MinX = Touch point moves further to the RIGHT of where touched
    Decrease MinX = Touch point moves further to the LEFT of where touched
     
    canderson, Sep 8, 2018
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  2. Niranjan HEWA JULIGE

    RobH079

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    Hi canderson thanks for the quick reply, I think the screen on this is too far out of whack to recalibrate or I'm doing something wrong. I've tried increasing both values on the X axis but since MaxX is already at 910 I don't really have a lot of room to increase it by.

    I've tried increasing MinX in increments of 20 right up to over 500 but no change to the screen behaviour. I'm going to try it again on a different computer just to rule out any funny business but I'm not holding my breath.
     
    RobH079, Sep 9, 2018
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  3. Niranjan HEWA JULIGE

    canderson Moderator

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    It could be that the resistivity has drifted too far to fall within the calibration ability of the file, but try working with MinX to see if you can get any real movement.
     
    canderson, Sep 9, 2018
  4. Niranjan HEWA JULIGE

    RobH079

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    I've tried heaps of different combinations for both MinX and MaxX, with no change but with one exception: when I make MinX larger than MaxX I get the same problem but with the opposite edge of the screen.

    Eg: 505 500 116 875 doesn't change anything, no matter where I press it activates the left border of the screen
    500 505 116 875 switches the problem to the right border of the screen

    Short of going through thousands of different combinations I don't know how to proceed, there doesn't seem to be any in-between.
     
    RobH079, Sep 9, 2018
  5. Niranjan HEWA JULIGE

    RobH079

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    I've also noticed that if I change the Y values and run a stylus over the screen erratically, the screen can sometimes be overwhelmed and then functions almost perfectly until the reset button is pressed, then it reverts back to the old problem. It's almost like a short/voltage change in the screen is causing it to go haywire. I've only managed to get it to do this once.
     
    RobH079, Sep 9, 2018
  6. Niranjan HEWA JULIGE

    canderson Moderator

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    Does sound like your touchscreen is shot. There are replacements available for it out there aplenty, but I wonder if it's worth it for a ONE 3rd.
     
    canderson, Sep 9, 2018
  7. Niranjan HEWA JULIGE

    RobH079

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    Agreed, after heaps of mucking around that's the conclusion I've come to. I've ordered a cheapo digitizer replacement from eBay so I'll see if that changes anything once it arrives. Thanks heaps for all your help with this, I will keep you posted on whether I manage to fix it!
     
    RobH079, Sep 10, 2018
  8. Niranjan HEWA JULIGE

    canderson Moderator

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    Be sure to keep a link to this thread. You'll may again need to use a calibration file. The original numbers in your device are stored in an area where they can't be changed (that's why you have to override it with the calibration file) and won't necessarily give you good results with a different screen. Those numbers are tailored to the screen that is originally fitted to the device.
     
    canderson, Sep 10, 2018
  9. Niranjan HEWA JULIGE

    Greg40

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    Hello all. I have a problem with the device TT GO920T. The device lay in the closet for several months, the battery has been discharged to zero. After charging and restarting, TT does not respond to touch at all. I tried to replace the cal.txt file in various ways, unfortunately with no result. Can I count on help? Original file Touchscreen calib date: 94 935 140 852 Thank you.
     
    Greg40, Oct 6, 2018
  10. Niranjan HEWA JULIGE

    canderson Moderator

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    Best give that little button in the bottom of the device a gentle poke with a paperclip or similar for a few seconds and hope for the best (that produces a hard reset).
    Sitting in the closet for a while isn't going to throw the calibration so far off that the touch screen ceases to work at all. It's beyond a calibration problem of some sort. The calibration file just adds a bit of offset to the device's current voltages vs. touch position that change a bit as a function of drifting resistance over time.
     
    canderson, Oct 7, 2018
  11. Niranjan HEWA JULIGE

    Greg40

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    Thank you for your reply friend canderson. The problem is that I have already tried this solution and unfortunately it does not bring any result. Second thing, in Navcore I do not see any file responsible for screen calibration. Should he be there?
    I also tried to start the device with another navcore from the SD card, also without changes. I also used the cal.txt file in various configurations. The device behaves as if the file was not there at all.
    Clearing the memory with the application of "clear flash" unfortunately did not help either.
     
    Last edited: Oct 7, 2018
    Greg40, Oct 7, 2018
  12. Niranjan HEWA JULIGE

    canderson Moderator

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    No. The original data is embedded in an area of memory where it is not seen or adjusted. That is what appears on the screen as the 'default' value when you go to the black and white diagnostic screen.
    From the factory, no unit has a calibration file. Those are only added by users after the fact if needed.
    If there is zero response to the screen, no amount of fiddling with calibration files is going to help.
     
    canderson, Oct 7, 2018
  13. Niranjan HEWA JULIGE

    Greg40

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    I understand that navigation can not be fixed anymore?
     
    Greg40, Oct 7, 2018
  14. Niranjan HEWA JULIGE

    canderson Moderator

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    Since we do not know if the failure is the touch panel or the motherboard, there isn't an easy solution. If we were sure that it was the touch panel, those are available to replace at a reasonable cost. But if you get one and it turns out that the panel was not bad, you are out that much money.
     
    canderson, Oct 8, 2018
  15. Niranjan HEWA JULIGE

    Greg40

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    It's hard, just put the device back into the closet, or sell it to someone else. Thank you for your interest in the topic.
     
    Greg40, Oct 8, 2018
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