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    JVC LT-40C860 stuck on logo

    Hi guys,
    I have a JVC LT-40C860 stuck on logo.
    I have tried all sorts of resets but nothing seems to help.
    I have checked the fuses on the main board and power supply and capacitors everything seems ok.

    From what i was reading on the forum I tend to believe it's a firmware problem.

    Now the question, is anyone who can give me the firmware so that i can put it on a usb drive and see if it solves my problem ?

    Tried contacting JVC but i got no reply.

    I've attached some pictures with the boards in case anyone wants any extra info.
    Thank you,
    Attached Files

    #2
    Re: JVC LT-40C860 stuck on logo

    Is U13 an MX25L512 EEPROM or equivalent. If so I would freeze it with freezer spray and make cerain it gets really cold (set powered off) and then attempt to reboot the TV. You may have a failing EEPROM
    Willing to help but I'm no expert.

    Comment


      #3
      Re: JVC LT-40C860 stuck on logo

      Originally posted by dick_barton View Post
      Is U13 an MX25L512 EEPROM or equivalent. If so I would freeze it with freezer spray and make cerain it gets really cold (set powered off) and then attempt to reboot the TV. You may have a failing EEPROM
      It is KH25L1606E. I'm just going to buy a spray and I'll give it a go

      Comment


        #4
        Re: JVC LT-40C860 stuck on logo

        I have frozen the EEPROM and it went over the logo but got reseted in a few seconds.

        Comment


          #5
          Re: JVC LT-40C860 stuck on logo

          if you cant find a firmware dump this maybe be your board maybe worth sending the seller a lower price offer
          https://www.ebay.co.uk/itm/234098833...EAAOSwpL5g-Jxy
          Last edited by vinceroger69; 08-09-2021, 09:58 AM.

          Comment


            #6
            Re: JVC LT-40C860 stuck on logo

            Try freezing it again and allow the EEPROM to get really cold. Give it several good blasts. Very often the inside of the IC hasn't become cold enough.
            Willing to help but I'm no expert.

            Comment


              #7
              Re: JVC LT-40C860 stuck on logo

              Originally posted by dick_barton View Post
              Try freezing it again and allow the EEPROM to get really cold. Give it several good blasts. Very often the inside of the IC hasn't become cold enough.
              I'll try gain, thank you

              Comment


                #8
                Re: JVC LT-40C860 stuck on logo

                I saved a tv like that. I desoldered the chip off the board and fit it in my eprom reader. Then i sprayed it ice cold and started the read process. During the read i sprayed it again. I got a data image. Saved it, and dumped it into a new blank chip and viola. It worked , tv went out back to customer, fixed.

                Comment


                  #9
                  Re: JVC LT-40C860 stuck on logo

                  Unfortunately the freezing didn't work for me and i don't think it's worth me buying a eeprom reader. I was looking for a firmware to use with an USB drive but no one seems to have one . I'm thinking on getting another main board.

                  Comment


                    #10
                    Re: JVC LT-40C860 stuck on logo

                    try this : https://yadi.sk/d/_zlpfQXu5tD28w
                    https://www.badcaps.net

                    Comment


                      #11
                      Re: JVC LT-40C860 stuck on logo

                      The EEPROM reader/writer is dead cheap and worth having in your tool box.
                      Willing to help but I'm no expert.

                      Comment


                        #12
                        Re: JVC LT-40C860 stuck on logo

                        Originally posted by arizanotlari View Post
                        Hi,
                        I have tried with this file but nothing happens, doesn't start updating

                        Comment


                          #13
                          Re: JVC LT-40C860 stuck on logo

                          Originally posted by dick_barton View Post
                          The EEPROM reader/writer is dead cheap and worth having in your tool box.
                          I have just ordered an EEPROM reader/writer . Thank you

                          Comment


                            #14
                            Re: JVC LT-40C860 stuck on logo

                            Originally posted by ioanban View Post
                            I have just ordered an EEPROM reader/writer . Thank you
                            Hi guys,
                            I have ordered an eeprom reader/writer but i couldnt get a working driver to be able to access the info on the eeprom so I bought a replacement main board and got it in. Tv is working perfect now.

                            If any of you has a reliable software for win10 that i can use with the eeprom reader/writer please share'it with me !

                            Regards,

                            Comment


                              #15
                              Re: JVC LT-40C860 stuck on logo

                              Which EEPROM reader/writer did you buy?
                              If it was the CH341A then here are a few progs that should work.
                              Attached Files
                              Last edited by dick_barton; 08-20-2021, 04:32 AM.
                              Willing to help but I'm no expert.

                              Comment


                                #16
                                Re: JVC LT-40C860 stuck on logo

                                Here is another program for CH341A.
                                Attached Files
                                Last edited by lotas; 08-20-2021, 05:06 AM.

                                Comment


                                  #17
                                  Re: JVC LT-40C860 stuck on logo

                                  Originally posted by dick_barton View Post
                                  Which EEPROM reader/writer did you buy?
                                  If it was the CH341A then here are a few progs that should work.
                                  I bought the CH341A.
                                  I'll try the progs you've given me.
                                  Thank you

                                  Comment

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