In-circuit eeprom programming

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  • RethoricalCheese
    Badcaps Legend
    • Mar 2013
    • 1517
    • Estonia

    #1

    In-circuit eeprom programming

    Since not desoldering the eeprom chip takes much less time, I was thinking about in-circuit programming. I have CH341A programmer, which works perfectly and I got myself a SOIC8 test clip. Paired those two and connected it to a HP Pavilion 15 eeprom.

    The problem is, that when I try to read from the chip, it only reads atleast 7 and up to 256 characters. No more, no less.

    Any idea what causes this problem and how can I fix it?
  • hansie55
    Badcaps Veteran
    • Dec 2013
    • 254
    • Netherlands

    #2
    Re: In-circuit eeprom programming

    I bought this test clip with the CH341a and it works ok.
    You have to pay attention to the connection on the CH341a, that is not the same as the program says, but as on the pcb from the programmer.
    Also, the clip on the chip has to be very good placed, makes also a difference.

    http://www.ebay.nl/itm/381028670542?...%3AMEBIDX%3AIT

    Comment

    • RethoricalCheese
      Badcaps Legend
      • Mar 2013
      • 1517
      • Estonia

      #3
      Re: In-circuit eeprom programming

      Had the same clip but without the wiring. That I made myself so it is made correctly.

      And, it was placed very well because it read the first characters correctly. Problem was, it just did not read all of the characters. So maybe it works with some motherboards and doesn't work with others?

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30952
        • Albion

        #4
        Re: In-circuit eeprom programming

        you cant read a chip in circuit for 2 reasons.
        1: it's already hooked up to other chips that are putting voltage on it's data pins.
        2: it may be in parallel with other serial devices like temperature sensors.

        there is ONE possible way around this - on a working system.
        boot into the bios and leave the menu on the screen while your reading the chip.
        that will keep the cpu busy doing - not a lot.
        Last edited by stj; 11-23-2015, 11:08 AM.

        Comment

        • sparker1
          Badcaps Veteran
          • Sep 2011
          • 343
          • Australia

          #5
          Re: In-circuit eeprom programming

          I have the EZP2010 and always de-soldered the bios chip to re-program it but I read on another thread that you could do this in circuit with attachment clips. I ordered one and the results have been disappointing. I have never been able to get a chip to register with the programmer when using it with the clips in circuit and I guess stj has given the reason. But isn't this what the clips were made for?

          Comment

          • TossDon
            AKA Masood
            • Jun 2013
            • 26
            • USA

            #6
            Re: In-circuit eeprom programming

            I have TL866 programmer, it came with a adapter that has a interface chip on it, it looks cheap but works good, I also have the similar SOIC8 plain regular adapter without the interface chip, never was able to read completely using it. I think CH314 and TL866 are more the same but for the form factor, check their site to make sure you are using the right connector.

            Comment

            • hansie55
              Badcaps Veteran
              • Dec 2013
              • 254
              • Netherlands

              #7
              Re: In-circuit eeprom programming

              [QUOTE=stj;609586]you cant read a chip in circuit for 2 reasons.
              1: it's already hooked up to other chips that are putting voltage on it's data pins.
              2: it may be in parallel with other serial devices like temperature sensors.

              In circuit does not necessarily mean with power on, so system off and there is no voltage on no pin.
              I put the ch341a in usb with 5V supply and it reads the entire 8mb.

              Comment

              • RethoricalCheese
                Badcaps Legend
                • Mar 2013
                • 1517
                • Estonia

                #8
                Re: In-circuit eeprom programming

                Indeed. I know it is possible (with power off). Just wondering why mine acted out.

                But since it takes a lot of time to get a good connection using the clip, I would say desoldering method is faster Or I'm just very bad with the clip.

                Comment

                • R_J
                  Badcaps Legend
                  • Jun 2012
                  • 9533
                  • Canada

                  #9
                  Re: In-circuit eeprom programming

                  The usb +5 volt supply can't power the circuit you are connecting to, there are other conponents connected to the vcc of the eeprom, like the microprocessor and its memory etc. even with the units power being off

                  Comment

                  • RethoricalCheese
                    Badcaps Legend
                    • Mar 2013
                    • 1517
                    • Estonia

                    #10
                    Re: In-circuit eeprom programming

                    An update to this topic.

                    A year has passed and I tried it again on some more laptops. Now it seems to work perfectly. Maybe it depended on the laptop design or something.

                    And also, I am trying to build a tiny pogo pin SPI adapter which might be much easier to operate.

                    Comment

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