Can the CH341A chip be programmed?

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  • hadyshahat
    EGYPT
    • May 2023
    • 35
    • Egypt

    #1

    Can the CH341A chip be programmed?

    Is it possible to program the CH341A chip, because I bought a replacement part and replaced the damaged one, but the programmer does not read?
    Please help​
    Attached Files
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 31009
    • Albion

    #2
    ch341a does not contain any data - something else maybe wrong - check it's getting power

    Comment

    • SMDFlea
      Super Moderator
      • Jan 2018
      • 20763
      • UK

      #3
      Originally posted by hadyshahat
      Is it possible to program the CH341A chip, because I bought a replacement part and replaced the damaged one, but the programmer does not read?
      Please help​
      What chip are you trying to read. Which CH341A do you have, post a picture, and what software version are you using.
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

      Comment

      • harp
        Badcaps Veteran
        • Jun 2022
        • 598
        • Planet Earth

        #4
        You have to inspect every track for connections and voltages, according to schematic.
        What is the reason to chip die?
        Attached Files

        Comment

        • hadyshahat
          EGYPT
          • May 2023
          • 35
          • Egypt

          #5
          Originally posted by SMDFlea

          What chip are you trying to read. Which CH341A do you have, post a picture, and what software version are you using.
          I bought a new chip for the programmer because the old chip was damaged and the new one when I installed it did not read on the computer and it does not sense it at all and the program I am using is version 2.2.10 it is the best program and I have been working on it for a long time because it is a very good program but the programmer does not read on the computer

          Comment

          • hadyshahat
            EGYPT
            • May 2023
            • 35
            • Egypt

            #6
            Originally posted by harp
            You have to inspect every track for connections and voltages, according to schematic.
            What is the reason to chip die?
            The reason for the chip damage is that the IC was installed in the opposite direction, so the CH341A chip reached a high temperature and burned out.

            Comment

            • stj
              Great Sage 齊天大聖
              • Dec 2009
              • 31009
              • Albion

              #7
              post a picture of the board.

              Comment

              • Sparklingx
                Member
                • Jul 2024
                • 41
                • Bangladesh

                #8
                Originally posted by harp
                You have to inspect every track for connections and voltages, according to schematic.
                What is the reason to chip die?
                hi what is the job of "pin 25" ? In my programmer pin 25 is not soldered but mine works fine(read,erase,write,verify)

                Comment

                • hadyshahat
                  EGYPT
                  • May 2023
                  • 35
                  • Egypt

                  #9
                  Originally posted by stj
                  post a picture of the board.
                  These are pictures of the programmer.
                  Attached Files

                  Comment

                  • Sparklingx
                    Member
                    • Jul 2024
                    • 41
                    • Bangladesh

                    #10
                    Originally posted by hadyshahat

                    These are pictures of the programmer.
                    you can try one thing connect a capacitor from GND to VDD then try. your's and mine are same board and chip(CH341B not A)
                    Attached Files

                    Comment

                    • harp
                      Badcaps Veteran
                      • Jun 2022
                      • 598
                      • Planet Earth

                      #11
                      Originally posted by hadyshahat

                      The reason for the chip damage is that the IC was installed in the opposite direction, so the CH341A chip reached a high temperature and burned out.
                      In that case, check also fuse and vreg. The soldering job... I will redoing that, it not look promising. At least, check that you dont have mechanicaly loosing legs of IC (say... crucial pin#14 X0 looks like bumped by cold joint) by slightly pushing every pin by its side - it must staj firm, no any movement... and check to pin by pin do not touch by side eg pin#1 and #2... use flux in the proces.

                      Put back C2 also, it is 100nF on 3.3v rail.
                      Last edited by harp; 09-01-2024, 06:23 AM.

                      Comment

                      • hadyshahat
                        EGYPT
                        • May 2023
                        • 35
                        • Egypt

                        #12
                        Originally posted by Sparklingx

                        you can try one thing connect a capacitor from GND to VDD then try. your's and mine are same board and chip(CH341B not A)
                        The computer does not read the original programmer.

                        Comment

                        • harp
                          Badcaps Veteran
                          • Jun 2022
                          • 598
                          • Planet Earth

                          #13
                          Originally posted by hadyshahat

                          The computer does not read the original programmer.
                          If power led turn on when connecting to working USB, then check if you have 3.3v present.

                          If LED stay off while inserted into usb, you have
                          - not vorking usb or
                          - not working led circuit or
                          - blown fuse or
                          - short on pcb

                          Check all that and report back with info.

                          Comment

                          • SMDFlea
                            Super Moderator
                            • Jan 2018
                            • 20763
                            • UK

                            #14
                            Originally posted by hadyshahat

                            The computer does not read the original programmer.
                            The LED has green corrosion on one pad,and on the other its blackened. C1 looks like its metal ends are missing. The USB socket pins might have some corrosion on them. C2 is broken/missing. The soldering on the F1 fuse doesn`t look too good. Besides all that the 16 pin socket is very dirty inside.
                            Did you check the fuse,voltage regulator and xtal.​
                            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                            Comment

                            • stj
                              Great Sage 齊天大聖
                              • Dec 2009
                              • 31009
                              • Albion

                              #15
                              do you see the power led light up?
                              if not check the fuse-resistor,
                              if you do then look at the 12MHz crystal and it's 2 caps

                              Comment

                              • hadyshahat
                                EGYPT
                                • May 2023
                                • 35
                                • Egypt

                                #16
                                The measurements are correct for a working LED but my computer does not recognize it.
                                Attached Files

                                Comment

                                • lotas
                                  Badcaps Legend
                                  • Jan 2016
                                  • 4579
                                  • Russia

                                  #17
                                  Update your driver. https://www.wch-ic.com/downloads/CH341SER_EXE.html
                                  https://www.wch-ic.com/downloads/CH341PAR_ZIP.html
                                  Last edited by lotas; 09-01-2024, 03:53 PM.

                                  Comment

                                  • hadyshahat
                                    EGYPT
                                    • May 2023
                                    • 35
                                    • Egypt

                                    #18
                                    The problem is not in the definition, the problem is in the IC

                                    Comment

                                    • rogfanther
                                      Badcaps Veteran
                                      • Jul 2006
                                      • 458
                                      • Brazil

                                      #19
                                      Can you measure the voltages in U1 ? Also, please re-check the soldering of the usb connector.

                                      Comment

                                      • CuriousDave
                                        Member
                                        • Aug 2024
                                        • 11
                                        • USA

                                        #20
                                        I am just wondering how much the programmer cost where you live. Isn't it cheaper to buy the programmer instead of trying to fix it? I just bought a new one from Amazon to find out if it reads the T2 ROM and it cost about $12 with two TSOP adapters and cables.

                                        Comment

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