CH341A problem reading bios chip

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  • JPToadstool
    Member
    • May 2020
    • 19
    • United Kingdom

    #1

    CH341A problem reading bios chip

    Morning all,

    Trying to create a BIOS backup of a Winbond 25Q80DVIG chip. I bought the CH341A with test clip from Amazon (this one). I could not get it to read with the test clip, I assume the test clip was not making contact with the pins. I have de-soldered the chip and soldered it onto a breakout board included, but when trying to read the BIOS, I get a power surge warning in Windows and a too high power draw error on Mac.

    Is this likely to be bad soldering, or another issue?


    Last edited by JPToadstool; 05-16-2020, 03:53 AM. Reason: Missing pictures
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30967
    • Albion

    #2
    Re: CH341A problem reading bios chip

    do you get that error without the flash chip installed in the programmer?

    Comment

    • JPToadstool
      Member
      • May 2020
      • 19
      • United Kingdom

      #3
      Re: CH341A problem reading bios chip

      Originally posted by stj
      do you get that error without the flash chip installed in the programmer?
      No, only with it.

      Comment

      • luckydip
        Senior Member
        • Aug 2016
        • 159
        • uk

        #4
        Re: CH341A problem reading bios chip

        Did you insert the test clip correctly into the programmer (see pic)?

        Do you get a red light when you plug it in?

        Can you detect the chip in the software?
        Attached Files
        Last edited by luckydip; 05-16-2020, 05:06 AM.

        Comment

        • JPToadstool
          Member
          • May 2020
          • 19
          • United Kingdom

          #5
          Re: CH341A problem reading bios chip

          Hi, thanks for the responses. I am not using a test clip as it didn't seem to be making contact with the pins with soldered to the M/B. I have desoldered and soldered onto the breakout board. I have a red light on power when plugging in - running without the breakout board installed shows the first message in the Terminal window. Plugging in with the breakout board and BIOS chip results in the second message and the notification about disabling USB.
          Attached Files

          Comment

          • luckydip
            Senior Member
            • Aug 2016
            • 159
            • uk

            #6
            Re: CH341A problem reading bios chip

            Originally posted by JPToadstool
            Hi, thanks for the responses. I am not using a test clip as it didn't seem to be making contact with the pins with soldered to the M/B. I have desoldered and soldered onto the breakout board. I have a red light on power when plugging in - running without the breakout board installed shows the first message in the Terminal window. Plugging in with the breakout board and BIOS chip results in the second message and the notification about disabling USB.

            Sorry, I have no experience in using this with macbooks. Have you got a pc to test it with?

            Looks like a connection/communication issue

            Comment

            • JPToadstool
              Member
              • May 2020
              • 19
              • United Kingdom

              #7
              Re: CH341A problem reading bios chip

              Okay, I tried the CH341A on an old Thinkpad I had laying around, also had a 25xx chip, and it read this using the clip whilst attached to the board just fine. I'll try desoldering the chip to another breakout board and see how that goes.

              Comment

              • JPToadstool
                Member
                • May 2020
                • 19
                • United Kingdom

                #8
                Re: CH341A problem reading bios chip

                I re-soldered it to a new breakout board and it worked fine. Thanks for your help though

                Comment

                • SMDFlea
                  Super Moderator
                  • Jan 2018
                  • 20566
                  • UK

                  #9
                  Re: CH341A problem reading bios chip

                  Some of the ch341a black pcb versions need a volt mod - https://www.eevblog.com/forum/repair...er-supply-fix/
                  All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                  Comment

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