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LCR T7 tester problem

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    #21
    Re: LCR T7 tester problem

    Don't have one but I'll see if I can find one in town

    Comment


      #22
      Re: LCR T7 tester problem

      Hi all.

      Feel I should update the situation...

      Stj's original suggestion regarding upgrading the crystal whilst installing two resistors and reflashing the Atmel was surely advice which I should have followed, however...

      Considering that the flashing kit was almost the same price as the 'latest' TC2 ESR tester, I took the lazy route and just before Xmas received the TC2.
      There are already three dead variations of the MK328 component tester in my 'to fix' bin, so I was über careful measuring caps with this one.

      After less than three weeks, whilst testing germanium diodes and transistors in an old radio, the TC2 just switched off. I didn't think much of it, as it had been doing that since it had arrived.

      But that is the state it is still in to this day!

      I have had a quick peek and found two dead zeners, and shall open up a new thread about this tester in the near future, with more detailed photos and explanation.
      To be honest, it is a pretty crap tester, but that's another story too.

      Thought it was a bit rude to not have given an ending to this thread..

      Cheers
      Attached Files

      Comment


        #23
        Re: LCR T7 tester problem

        ...
        saves a lot of messing around with patch wires...

        Just interesting... stj

        I have also a simmilar LCR-T5 the red one with two button, and... acidently testing a charged cap... offcorse
        The tester at this point shows wiered things, mostly like mosfets or so... it boots up normaly... so, I thinking, maybe is burned some input thingy inside uC but maybe lucky enough to extract firmware from it? I realy like it original chinese firmware.

        Question is, can I read and write atmega328 with ch341a programmer throu spi header, and what prearrangement have to be done before that?
        I do not any experiance about that, so please explain step by step
        Can be done in circuit somehow?
        Attached Files
        Last edited by harp; 03-04-2023, 07:59 PM.

        Comment


          #24
          Re: LCR T7 tester problem

          that looks like the old "fish" tester i think - very early design style.
          firstly, if it's not dead check if it has the input protection diode-pack.
          if it does then remove it and try again.
          Attached Files

          Comment


            #25
            Re: LCR T7 tester problem

            I dont see any protection diode pack...
            Attached Files

            Comment


              #26
              Re: LCR T7 tester problem

              under the board?

              Comment


                #27
                Re: LCR T7 tester problem

                No, on back side there is no any component.
                This 6-leg smd package nor multiple diodes is not on the pcb.
                I look even under zif socket.
                Last edited by harp; 03-05-2023, 04:01 PM.

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                  #28
                  Re: LCR T7 tester problem

                  then check the 6 resistors on the sensing likes, if they are good your atmel is damaged.
                  on the bright side - it has a programming header.

                  Comment


                    #29
                    Re: LCR T7 tester problem

                    Check R1 till R6 in circuit, all is still ok... 680R and 470K
                    Check for shorts and nothing find.
                    Input pins 1, 2 and 3 from zif socket are also directly connected to atmega328 pin #23, #24 and #25.

                    So, can I try to read this chip with CH341A, is connection direct or crossover some pin... what power... what is next step?

                    Comment


                      #30
                      Re: LCR T7 tester problem

                      i have never used a ch341 to read the spi bus, so i dont know.
                      99% chance they set the lock bits though, or the firmware would be online somewhere.
                      unless it's here:
                      https://disk.yandex.com/d/yW8xa5NJgUo5z

                      Comment


                        #31
                        Re: LCR T7 tester problem

                        Ok, if we pretended to I have USBasp programmer with all needed wires what is next to do to try to read atmega328?
                        I accept a 1% chance for success if you can guide me
                        I just read MX25L3205D with it, so it does SPI as well.

                        Comment


                          #32
                          Re: LCR T7 tester problem

                          download AVRdude and it's pdf
                          then if it supports your programmer use it to read the flash, eeprom and fuses in 3 seperate passes
                          https://github.com/avrdudes/avrdude
                          https://avrdudes.github.io/avrdude/7.1/avrdude.html

                          or try the factory software for the ch341?

                          Comment


                            #33
                            Re: LCR T7 tester problem

                            actually i think NeoProgrammer can do it with ch341
                            https://www.badcaps.net/forum/showpo...postcount=2373

                            Comment


                              #34
                              Re: LCR T7 tester problem

                              Thank you very much, I need some time to setting up wires and program...
                              I downloads a bounch of random software who claim to can comunicate with avr from ch341... we will see...

                              Comment


                                #35
                                Re: LCR T7 tester problem

                                ok, here is update

                                For reference I working with winxp sp2... 32bit.
                                I aim to download program for programing avr via ch341:

                                neoprogramer 2.1.0.19 - work ok, but fuse tab is no description and it is confusing for beginers. Still it is good interface and work great. Neo 2.2 I download from past link but I cant extract. I guess there is no big diference.

                                avrdude with gui is a basic and it is... basic
                                I can start this gui, but indeed it is not user friendly, only graphicaly presented cmd line... unknown purpose for doing that... presume that I already know all about microcontrolers to save me some space on screen - no description and meaning at all whatsoever. So... next!

                                avrdudess 2.14 - from pictures look user friendly with some description, but I can not start it because of missing some crucial component who isnt preinstalled on my os and it isnt in the same package within too...

                                avr-ch341 is a look good small program (3 files) that work out of the box and have description with any option. I will use this program at the moment till not find a basic failure or so. It is yet simply and neat, and it is still free

                                So... I build a small adapter, basicly original male-female jumper wires glued on some wooden cube... it is handy because I can use it via zif socket. I test it with through arduino icsp connector and can read a flash, eprom and fuses. But when I conected it with LCR-T5 it pulls all FF FF FF FF on screen... and say that device is disabled for future programing and verification...
                                So... is there is a way to overcome this, to anyway read firmware from chip, or at least erase it for reusing it?

                                In meantime I was try to download firmware from yandex link but I cant due to old browser. Please can you do (or somebody else) to download a firmware pack for me, my tester and upload it here?

                                It is fish8840 design version 2.1, with two button,
                                atmega328p, 8MHz, monochrome (green) dot matrix display 12864LCD

                                And... before I mess up with future chip desoldering and ripping up a bunch of pads, is any precautions, sugestions, procedure that I must know or deal with before programing it?
                                Attached Files
                                Last edited by harp; 03-12-2023, 09:16 AM.

                                Comment


                                  #36
                                  Re: LCR T7 tester problem

                                  install peazip
                                  https://peazip.com/

                                  install the final version of opera
                                  Attached Files

                                  Comment


                                    #37
                                    Re: LCR T7 tester problem

                                    Wow! thank you very much, i must study this now... but before one question: the fuses is program before or after flash memory?

                                    Comment


                                      #38
                                      Re: LCR T7 tester problem

                                      fuses last - because if you accidentally protect the chip you cant verify it.
                                      and you dont want to screw up the clock setting while programming either.

                                      first the flash,
                                      then thr eeprom,
                                      fuses last.

                                      Comment


                                        #39
                                        Re: LCR T7 tester problem

                                        Here is avrdudess portable program, with CH341A support.
                                        Attached Files

                                        Comment


                                          #40
                                          Re: LCR T7 tester problem

                                          So yeah, some progress is done

                                          1. desoldering the chip... ok
                                          2. buying new... ok
                                          3. soldering new chip... ok
                                          4. connecting with ch341a... ok
                                          5. load and program original hex... ok
                                          6. verify flash... error at address 0x2? but it looks identical, maybe some bug? I can read the flash.
                                          7. load and program original eep... ok
                                          8. verify eeprom... ok
                                          9. confused with fuses, waiting for help...

                                          it has some picture for fuses in folder Fish-8840/Firmware/Original(ver2.1) but it is all different to me... russian notes... I dont know what to choose.

                                          on original "destroyed" ic, I got fuses reading of
                                          extended 0x05
                                          high 0xD9
                                          low 0xF7

                                          I put attached photo of new chip fuses, and AVRCH341A interface.
                                          I didnt touch anything yet

                                          help... what to enter?

                                          P.S. can you point me where to look for 0x2 address?
                                          Attached Files
                                          Last edited by harp; 03-18-2023, 05:42 PM.

                                          Comment

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