Panasonic 65" VT20 10 blink code

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  • infrag
    Senior Member
    • Jun 2012
    • 89
    • australia

    #61
    Re: Panasonic 65" VT20 10 blink code

    Anyone know where I can buy that IC?
    MP2396ES

    C0DBAYY00727
    Last edited by infrag; 03-19-2017, 05:38 AM.

    Comment

    • infrag
      Senior Member
      • Jun 2012
      • 89
      • australia

      #62
      Re: Panasonic 65" VT20 10 blink code

      Originally posted by tn245
      What's the resistance between pin 2 and gnd on both boards?
      Bad board:
      8.1k

      Good :

      9.3k

      Comment

      • budwich
        Badcaps Legend
        • Jul 2015
        • 3097
        • Canada

        #63
        Re: Panasonic 65" VT20 10 blink code

        measure the same points in reverse as there is a diode in the circuit which maybe impacting measurements.... maybe. It doesn't look good for the IC based on some of your work to date. But possibly do some more resistance check comparison between the working board and non-working. This may give you some further pointers to either the IC or supporting / connnected circuit component issues.

        Comment

        • tn245
          Badcaps Veteran
          • Oct 2013
          • 530
          • UK

          #64
          Re: Panasonic 65" VT20 10 blink code

          Good progress anyway I think. I was mainly asking for resistance on pin 2 to see if there was a short in the circuit on the output side of the ic dropping the output down. Doesn't seem to be shorted as the 8v you supplied remained, though there is a difference in the resistance reading. I guess you could confirm if it's the ic or not by swapping them between the boards. Resistance readings on all the pins might give some direction too. If you do remove the ics take readings on pads while ics are off. Also a bit of freeze spray may just kick the bad ic into action - maybe try that first. Just throwing out ideas.

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #65
            Re: Panasonic 65" VT20 10 blink code

            Originally posted by infrag
            Bad board:
            8.1k

            Good :

            9.3k

            What value resistors are connected to pin 2 as in attached diagram marked as R1 & R2
            Attached Files
            Willing to help but I'm no expert.

            Comment

            • budwich
              Badcaps Legend
              • Jul 2015
              • 3097
              • Canada

              #66
              Re: Panasonic 65" VT20 10 blink code

              Originally posted by tn245
              Good progress anyway I think. I was mainly asking for resistance on pin 2 to see if there was a short in the circuit on the output side of the ic dropping the output down. Doesn't seem to be shorted as the 8v you supplied remained, though there is a difference in the resistance reading. I guess you could confirm if it's the ic or not by swapping them between the boards. Resistance readings on all the pins might give some direction too. If you do remove the ics take readings on pads while ics are off. Also a bit of freeze spray may just kick the bad ic into action - maybe try that first. Just throwing out ideas.
              I like the idea of "swapping IC" IF you are good at desoldering / soldering packages. It could an "easy" way out.... or not :-)

              Comment

              • infrag
                Senior Member
                • Jun 2012
                • 89
                • australia

                #67
                Re: Panasonic 65" VT20 10 blink code

                I dont mind to try desoldering/soldering the IC. However I'd like to find and order a backup one or 2 just in case and then try while the backup ones are on the way here.

                The problem is I cant find anywhere to order the things to send to Australia

                Comment

                • budwich
                  Badcaps Legend
                  • Jul 2015
                  • 3097
                  • Canada

                  #68
                  Re: Panasonic 65" VT20 10 blink code

                  but as suggested, do the "comparison resistive" measurement around the chip. This may give you an idea if the chip is indeed the culprit or a supporting circuit component is fried. The "re-chip" is somewhat of a "last resort".

                  Comment

                  • tw2005
                    Badcaps Legend
                    • Oct 2011
                    • 6458
                    • Australia

                    #69
                    Re: Panasonic 65" VT20 10 blink code

                    you could try utsource but check package and dimensions of what's currently fitted just in case there's more than one package size.

                    Datasheet has it as SOIC 8, 5mm x 4mm

                    UTSOURCE has SOP8, which could be an error

                    expect 3 weeks turnaround

                    Comment

                    • infrag
                      Senior Member
                      • Jun 2012
                      • 89
                      • australia

                      #70
                      Re: Panasonic 65" VT20 10 blink code

                      Originally posted by tw2005
                      you could try utsource but check package and dimensions of what's currently fitted just in case there's more than one package size.

                      Datasheet has it as SOIC 8, 5mm x 4mm

                      UTSOURCE has SOP8, which could be an error

                      expect 3 weeks turnaround
                      Ordered a couple of them just in case.
                      Thanks heaps.
                      I'd never heard of utsource.

                      Cheapest other one I found was the same price but postage was minimum of $30.

                      Comment

                      • infrag
                        Senior Member
                        • Jun 2012
                        • 89
                        • australia

                        #71
                        Re: Panasonic 65" VT20 10 blink code

                        Originally posted by tw2005
                        Postage of what?

                        I'm thinking down the track a bit for the 65"

                        No manuals will make it hard but essentially if you think of the board as a processor then the only difference between any model is the firmware , data, program loaded on non volatile memory.

                        some of it is common. So either desolder and swapover or copy the data and overwrite the chips but you'd need a clip.

                        I've had some fun with a CH341 but the clips supplied are rubbish
                        Hey do you have a guide to the CH341? I bought one recently and figured I might as well have a play around while I'm waiting for parts

                        Cheers

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia

                          #72
                          Re: Panasonic 65" VT20 10 blink code

                          Originally posted by infrag
                          Hey do you have a guide to the CH341? I bought one recently and figured I might as well have a play around while I'm waiting for parts

                          Cheers
                          HERE.

                          has a link for downloads, not sure what'll you'll find

                          https://www.youtube.com/watch?v=L0ChYNwunUE

                          what sort of playing?

                          If you're playing with the A boards, copy and save the original contents , label so it can't get mixed up. Pay attention to whether it's a 24 or 25 series chip as the pinouts are different and how you set up the the CH341A too.

                          If it's wrong you'll see the led go dim, things get hot and then some of that smoky stuff starts to release.

                          I know the original clip and cable was rubbish, broke after a few uses,

                          Comment

                          • infrag
                            Senior Member
                            • Jun 2012
                            • 89
                            • australia

                            #73
                            Re: Panasonic 65" VT20 10 blink code

                            Originally posted by tw2005
                            HERE.

                            has a link for downloads, not sure what'll you'll find

                            https://www.youtube.com/watch?v=L0ChYNwunUE

                            what sort of playing?

                            If you're playing with the A boards, copy and save the original contents , label so it can't get mixed up. Pay attention to whether it's a 24 or 25 series chip as the pinouts are different and how you set up the the CH341A too.

                            If it's wrong you'll see the led go dim, things get hot and then some of that smoky stuff starts to release.

                            I know the original clip and cable was rubbish, broke after a few uses,
                            I was going to see if I could just download the eeprom from the A board just in case.

                            So did you get a clip with yours to clip onto the chip while its still soldered on the board?
                            Otherwise mine must have been too cheap and missed the whole clip idea...

                            Comment

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6458
                              • Australia

                              #74
                              Re: Panasonic 65" VT20 10 blink code

                              Originally posted by infrag
                              I was going to see if I could just download the eeprom from the A board just in case.

                              So did you get a clip with yours to clip onto the chip while its still soldered on the board?
                              Otherwise mine must have been too cheap and missed the whole clip idea...
                              yeah , came with a clip although it broke and now I can read, but not program so I just take the chip off and solder it onto the board that came with it.

                              So far I've fixed a corrupted eeprom with it and done a conversion on a new zealand board. Kinda fun transferring the DNA across.

                              3M and Pomona are 2 brands for those clips. Not cheap, I'll get one one day

                              Comment

                              • infrag
                                Senior Member
                                • Jun 2012
                                • 89
                                • australia

                                #75
                                Re: Panasonic 65" VT20 10 blink code

                                Well I have an update.
                                The replacement IC's came in. I soldered the chip in and turned the TV on. It worked!. I checked output voltage from the IC it was 8.5V. Then I turned the TV off.... and tried to turn it back on again. The relay clicked to turn on and then the TV turned off with the same blink code again. Bugger...

                                The other symptom is the IC does get hot while the TV is on.

                                Since I've tested most other parts in circuit I feel I'm chasing my tail.

                                I've done a non normal fix I guess and used a 5v relay to trigger when the 3.3V panel on comes through. This triggers a separate adjustable output voltage regulator which is powered by the 15V and changes it to the required 8V and feeds that back into the circuit.

                                The long and short of it is that this seems to work but theres obviously some other part in circuit thats not performing correctly. I've had the TV on for an hour and nothing seems to be getting hot.

                                If it dies I'll just have to get another board.

                                Thanks very much for the help in finding the faulty area!

                                Comment

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