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  • Lilliput touchscreen EEPROM failure

    I have read a few threads and would like to know if there is a consensus on how to fix this... My touchscreen worked fine for less than an hour, then after connecting it to my carputer and loading my WinXP and everything else, I get the EEPROM error and can't calibrate. Is there a loose connection inside or is the small chip on the touch board need to be replaced?
    Aopen i855GMEm-LFS with Dothan 1.8ghz
    512mb DDR333
    Windows XPpro SP2

  • #2
    Originally posted by ddogg_777
    I have read a few threads and would like to know if there is a consensus on how to fix this... My touchscreen worked fine for less than an hour, then after connecting it to my carputer and loading my WinXP and everything else, I get the EEPROM error and can't calibrate. Is there a loose connection inside or is the small chip on the touch board need to be replaced?
    Read this thread:

    http://www.mp3car.com/vbulletin/showthread.php?t=15386

    End result was that I needed to get the controler replaced...it had crapped out / or was no good to begin with.

    Comment


    • #3
      Exactly

      A new controller will fix this problem.

      Also, I had one of the Lilliputs with this problem and the controller started working after a week. On others the problem doesn't go away and the touch controller needs to be replaced.

      Armen


      Originally posted by VWTronics
      Read this thread:

      http://www.mp3car.com/vbulletin/showthread.php?t=15386

      End result was that I needed to get the controler replaced...it had crapped out / or was no good to begin with.
      http://www.digitalww.com

      Comment


      • #4
        I did but it seems as though the thread was never finished...
        Aopen i855GMEm-LFS with Dothan 1.8ghz
        512mb DDR333
        Windows XPpro SP2

        Comment


        • #5
          So, what's to say that a new touchscreen board won't fail in a few days? My Lilliput was bought from the manufacturer in December.
          Aopen i855GMEm-LFS with Dothan 1.8ghz
          512mb DDR333
          Windows XPpro SP2

          Comment


          • #6
            It is very rare that this happens. If you would have bought your monitor from me then I would replace the controller for FREE (1 year warrantee).

            Have you tried contacting the person you bought it from? Maybe they will also replace it for free.

            Armen



            Originally posted by ddogg_777
            So, what's to say that a new touchscreen board won't fail in a few days? My Lilliput was bought from the manufacturer in December.
            http://www.digitalww.com

            Comment


            • #7
              Originally posted by digitalww
              It is very rare that this happens. If you would have bought your monitor from me then I would replace the controller for FREE (1 year warrantee).

              Have you tried contacting the person you bought it from? Maybe they will also replace it for free.

              Armen
              Armen, you were never around when I wanted one and I decided to get one direct from China; Krystar went over in November and picked up 20 for us. I emailed the manufacturers and am waiting for a response. I decided that since I will be taking it apart, it would void your warranty too. Fortunately, I hadn't taken it apart yet when the problem came up
              Aopen i855GMEm-LFS with Dothan 1.8ghz
              512mb DDR333
              Windows XPpro SP2

              Comment


              • #8
                Originally posted by ddogg_777
                I have read a few threads and would like to know if there is a consensus on how to fix this... My touchscreen worked fine for less than an hour, then after connecting it to my carputer and loading my WinXP and everything else, I get the EEPROM error and can't calibrate. Is there a loose connection inside or is the small chip on the touch board need to be replaced?
                Regarding the USB touchscreen controller (from my site @ http://www.tmz.com/wrx/lilliputLCD.html):

                The tiny 8 pin chip is the ATC 93C46 and is a 1 kBit serial EEPROM, or SEEPROM. ATCorp doesn't have any datasheets on their website, but the same part is also made by Microchip and Holtek. The minute I start getting any EEPROM errors with the touchscreen, I'm pulling off that cheap ATC chip and replacing it with a Microchip. Not sure it would solve the problem, but it would be an easy way to check.

                If you can't desolder and resolder a surface mount chip, then send it to me and I'll do it for you. I'd be happy to do it just to check my suspicion. I've dont more than my fair share of surface mount soldering and rework. If you can, send me the chip also. If not, I'll grab one from Digikey next time I'm ordering from them.

                Comment


                • #9
                  PHC, I was hoping you would chime in. I was gonna ask you if you ever needed to change out your chip. What style chip do I look for: TSSOP, MSOP, rotated...etc.
                  Aopen i855GMEm-LFS with Dothan 1.8ghz
                  512mb DDR333
                  Windows XPpro SP2

                  Comment


                  • #10
                    Originally posted by ddogg_777
                    PHC, I was hoping you would chime in. I was gonna ask you if you ever needed to change out your chip. What style chip do I look for: TSSOP, MSOP, rotated...etc.
                    I don't have a good picture of it on my web page, might have to take it apart again or look at the raw photos. Its probably a 8 Pin SOIC, I'm 90% sure.

                    Digikey # 93C46B/SN-ND

                    Datasheet:
                    http://www.microchip.com/download/li...arc/21749d.pdf

                    Comment


                    • #11
                      So it's a 16-bit eeprom with the gull wing surface mount leads. When do you think you will order next from Digikey?
                      Aopen i855GMEm-LFS with Dothan 1.8ghz
                      512mb DDR333
                      Windows XPpro SP2

                      Comment


                      • #12
                        Originally posted by ddogg_777
                        So it's a 16-bit eeprom with the gull wing surface mount leads. When do you think you will order next from Digikey?
                        Hard to tell, just did one this week, may not be until 1-2 more weeks. I'm out of town the rest of this week until early next week. Headin to Philedelphia - watch for me behind the end zone of the Eagles vs. Panthers game.

                        Comment


                        • #13
                          Well, the problem has been identified...
                          I took the monitor out and connected it to the original test computer and the touchscreen works fine again, no EEPROM failure. It seems that the Touchscreen is remembering the computer it was calibrated on. So...I erased the calibration and uninstalled all the drivers, powered down the desktop, and unplugged the Lilliput. Now I will try it on my carputer and keep you all up to date.
                          Aopen i855GMEm-LFS with Dothan 1.8ghz
                          512mb DDR333
                          Windows XPpro SP2

                          Comment


                          • #14
                            ?????

                            so did you get to solved the problem with the eeprom failling....if so how?
                            98.8 complete
                            95 chevy blazer s10

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                            • #15
                              I erased the calibration, uninstalled all the drivers, powered down the desktop, and unplugged the Lilliput. Then, I reinstalled.
                              Aopen i855GMEm-LFS with Dothan 1.8ghz
                              512mb DDR333
                              Windows XPpro SP2

                              Comment

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