JVC LT-40C860 stuck on logo

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  • ioanban
    Member
    • Dec 2020
    • 47
    • uk

    #1

    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
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #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

    • ioanban
      Member
      • Dec 2020
      • 47
      • uk

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

      Originally posted by dick_barton
      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

      • ioanban
        Member
        • Dec 2020
        • 47
        • uk

        #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

        • vinceroger69
          Badcaps Legend
          • Mar 2012
          • 6714
          • uk

          #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

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #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

            • ioanban
              Member
              • Dec 2020
              • 47
              • uk

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

              Originally posted by dick_barton
              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

              • angelos
                Badcaps Veteran
                • Dec 2012
                • 562
                • South Africa

                #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

                • ioanban
                  Member
                  • Dec 2020
                  • 47
                  • uk

                  #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

                  • arizanotlari
                    Senior Member
                    • Nov 2014
                    • 158
                    • Turkiye

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

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

                    Comment

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6642
                      • Wales

                      #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

                      • ioanban
                        Member
                        • Dec 2020
                        • 47
                        • uk

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

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

                        Comment

                        • ioanban
                          Member
                          • Dec 2020
                          • 47
                          • uk

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

                          Originally posted by dick_barton
                          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

                          • ioanban
                            Member
                            • Dec 2020
                            • 47
                            • uk

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

                            Originally posted by ioanban
                            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

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales

                              #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

                              • lotas
                                Badcaps Legend
                                • Jan 2016
                                • 4479
                                • Russia

                                #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

                                • ioanban
                                  Member
                                  • Dec 2020
                                  • 47
                                  • uk

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

                                  Originally posted by dick_barton
                                  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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