Vertical lines, kdl-40lx900, i susect tcon

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  • Dogcatdog
    Senior Member
    • Sep 2015
    • 76
    • USA

    #21
    Re: Vertical lines, kdl-40lx900, i susect tcon

    just tried that, with a hairdryer, held it about 5 mins around there it was a bit hot like almost to hot to touch with the backside of my index finger but not that hot.
    i hope that was hot enough.
    there was no change what so ever

    thank you in advance

    Originally posted by freakaftr8
    Ok apply some heat to ic303 and ic300 then test.

    Comment

    • Dogcatdog
      Senior Member
      • Sep 2015
      • 76
      • USA

      #22
      Re: Vertical lines, kdl-40lx900, i susect tcon

      what else can i test?

      Comment

      • budwich
        Badcaps Legend
        • Jul 2015
        • 3097
        • Canada

        #23
        Re: Vertical lines, kdl-40lx900, i susect tcon

        Originally posted by mistertv
        have you checked the flat heat-sealed under the metal frame of the display?
        OP, I don't think you ever responded to this suggestion. It might be worth you time to look. Something might be touching somewhere it shouldn't.

        Comment

        • Dogcatdog
          Senior Member
          • Sep 2015
          • 76
          • USA

          #24
          Re: Vertical lines, kdl-40lx900, i susect tcon

          somehow i missed that, well i took it completely apart to the bondings and to check if the bonds are the problem, that took ages, but they are fine and dont have a problem at all, touching them applying pressure did not change anything at all in the picture. so i guess the problem is the t-con,or maybe the mainboard? i dont know how to make sure, the question remains what could be dead there and how to test it, i would like to fix it on the component level.

          thank you very much in advance
          Originally posted by budwich
          OP, I don't think you ever responded to this suggestion. It might be worth you time to look. Something might be touching somewhere it shouldn't.

          Comment

          • Dogcatdog
            Senior Member
            • Sep 2015
            • 76
            • USA

            #25
            Re: Vertical lines, kdl-40lx900, i susect tcon

            any other ideas?

            Comment

            • Dogcatdog
              Senior Member
              • Sep 2015
              • 76
              • USA

              #26
              Re: Vertical lines, kdl-40lx900, i susect tcon

              there is a chip marked MAX17079 http://pdf1.alldatasheet.com/datashe...17079_10.html_ on the tcon, is that the gamma chip?

              Comment

              • Dogcatdog
                Senior Member
                • Sep 2015
                • 76
                • USA

                #27
                Re: Vertical lines, kdl-40lx900, i susect tcon

                here are the Volt measurements i got for MAX17079
                Pin 01. - 1.70V
                Pin 02. - 0.00V
                Pin 03. - 1.70V
                Pin 04. - 0.00V
                Pin 05. - 1.70V
                Pin 06. - 0.00V
                Pin 07. - 1.70V
                Pin 08. - 0.00V
                Pin 09. - 1.70V
                Pin 10. - 0.00V
                Pin 11. - 1.70V
                Pin 12. to Pin 15 - 0.00V
                Pin 16. - 5.94V
                Pin 17. - 4.81V
                Pin 18. to Pin 32 - 6.08V
                Pin 33. - 0.00V
                Pin 34. - 8.12V
                Pin 35. - 7.39V
                Pin 36. - 15.35V
                Pin 37. - 0.00V
                Pin 38. - 3.41V
                Pin 39. - 3.26V
                Pin 40. - 0.00V

                Comment

                • Dogcatdog
                  Senior Member
                  • Sep 2015
                  • 76
                  • USA

                  #28
                  Re: Vertical lines, kdl-40lx900, i susect tcon

                  hrmm seems like this is the Gamma chip, i could not find the datasheet, its MAX9697A https://www.maximintegrated.com/en/p...l/MAX9697.html i attached a picture with the measured voltages, since i dont know which is pin 1.
                  so this is the best i came up with.

                  thank you in advance
                  Attached Files

                  Comment

                  • Dogcatdog
                    Senior Member
                    • Sep 2015
                    • 76
                    • USA

                    #29
                    Re: Vertical lines, kdl-40lx900, i susect tcon

                    i wonder what the other chip then is the MAX17079, i mean its function

                    Comment

                    • Dogcatdog
                      Senior Member
                      • Sep 2015
                      • 76
                      • USA

                      #30
                      Re: Vertical lines, kdl-40lx900, i susect tcon

                      i found something.
                      there is an smd part marked, 33300 K028F,

                      When i try to measure the Voltage the pattern changes and or the screen goes black but im not sure if that thing
                      is the reason. it happens also when i push with my finger in that area, but only while i touch ground (chassis)
                      but same happens when i try to measure "capacitors/resistors"? around there
                      not sure what they are, cause there are no markings i will point them out in the picture
                      Attached Files

                      Comment

                      • freakaftr8
                        Badcaps Legend
                        • Oct 2012
                        • 3743
                        • USA

                        #31
                        Re: Vertical lines, kdl-40lx900, i susect tcon

                        You're pushing a small signal current into those test points changing the pattern on the screen from obviously varying the voltage to the main Sony processor. I would be under the assumption that either the main processor which is that big Sony CXD9982GG either has a bad BGA connection to the board or its bad itself. I would try to heat it up and see if the pattern changes at all.

                        And yes that Maxim chip is the gamma processor. Sharp likes to use those for their panels
                        Last edited by freakaftr8; 11-20-2015, 12:10 PM.
                        Did I leave the soldering iron on?

                        Comment

                        • Dogcatdog
                          Senior Member
                          • Sep 2015
                          • 76
                          • USA

                          #32
                          Re: Vertical lines, kdl-40lx900, i susect tcon

                          so... shove it in the oven for like 5 mins at ca. 200 Celsius? or higher and or longer?


                          Originally posted by freakaftr8
                          You're pushing a small signal current into those test points changing the pattern on the screen from obviously varying the voltage to the main Sony processor. I would be under the assumption that either the main processor which is that big Sony CXD9982GG either has a bad BGA connection to the board or its bad itself. I would try to heat it up and see if the pattern changes at all.

                          And yes that Maxim chip is the gamma processor. Sharp likes to use those for their panels

                          Comment

                          • freakaftr8
                            Badcaps Legend
                            • Oct 2012
                            • 3743
                            • USA

                            #33
                            Re: Vertical lines, kdl-40lx900, i susect tcon

                            well if you put enough time into it and you've got nothing left for it when I say go for it 450 degrees Fahrenheit for exactly 8 minutes. Then open the oven door turn the oven off let it cool for another 15 minutes before you touch it. And of course prop it up on something so the bottom of the board is not touching any metal surfaces
                            Did I leave the soldering iron on?

                            Comment

                            • Dogcatdog
                              Senior Member
                              • Sep 2015
                              • 76
                              • USA

                              #34
                              Re: Vertical lines, kdl-40lx900, i susect tcon

                              well i can set the oven for 230 Celsius which is 446 Fahrenheit will that do?
                              i can just set the temperature in 10C increments on my oven, so either 220C, 230C or if 230C is not enough then 240C which is then 464 Fahrenheit, and i can set the time for exact 8 mins. on my oven, more or less concerning question: there are some components on the bottom side, so i wonder wont those just fall off the board when i try to reflow the solder? or will the surface tension keeps those on the board?

                              thank you in advance

                              Originally posted by freakaftr8
                              well if you put enough time into it and you've got nothing left for it when I say go for it 450 degrees Fahrenheit for exactly 8 minutes. Then open the oven door turn the oven off let it cool for another 15 minutes before you touch it. And of course prop it up on something so the bottom of the board is not touching any metal surfaces
                              Last edited by Dogcatdog; 11-20-2015, 01:21 PM.

                              Comment

                              • Dogcatdog
                                Senior Member
                                • Sep 2015
                                • 76
                                • USA

                                #35
                                Re: Vertical lines, kdl-40lx900, i susect tcon

                                ah one more thing, i can preheat the oven to the specific temperature, the question is should i shove the board in once the target temperature is reached,? or put it in from the beginning when i turn on the oven and let it get to 230C or 240C and then once it reached that, let it run for 8 mins, im asking because it takes a good 10 mins to reach the 230C i mean to preheat the oven. that would then mean the board is in for around 18 mins. so im not sure thats to long or not.

                                Comment

                                • jeffecor
                                  Senior Member
                                  • Sep 2014
                                  • 78
                                  • kent

                                  #36
                                  Re: Vertical lines, kdl-40lx900, i susect tcon

                                  No heat the oven up first! Then 8 mins

                                  Comment

                                  • Dogcatdog
                                    Senior Member
                                    • Sep 2015
                                    • 76
                                    • USA

                                    #37
                                    Re: Vertical lines, kdl-40lx900, i susect tcon

                                    so... shoved it in the oven for 8 mins. the tcon board, and thought well lets see, and well no change at all, then i thought, well lets try the mainboard, and hrmm still same no change at all in any kind, the symptoms are exactly the same, so i wonder, can it be caused by the power supply??? i cant imagine but who knows? what do you guys say? and if it is the SMPS what part of it could it be? what to test and what to test for?

                                    Comment

                                    • budwich
                                      Badcaps Legend
                                      • Jul 2015
                                      • 3097
                                      • Canada

                                      #38
                                      Re: Vertical lines, kdl-40lx900, i susect tcon

                                      You should try and trace the tracks going to and from the component in question. That might provide some clues (ie. are they going to grounds, power, interconnection to other ics, connection to resistors, etc?

                                      Comment

                                      • Dogcatdog
                                        Senior Member
                                        • Sep 2015
                                        • 76
                                        • USA

                                        #39
                                        Re: Vertical lines, kdl-40lx900, i susect tcon

                                        which component are we talking about? "33300 K028F?" ? im not even sure what it is, i know that 2 terminals lead to ground of that and 2 lead somewhere into the processor since its a BGA i cant check where
                                        Originally posted by budwich
                                        You should try and trace the tracks going to and from the component in question. That might provide some clues (ie. are they going to grounds, power, interconnection to other ics, connection to resistors, etc?

                                        Comment

                                        • Dogcatdog
                                          Senior Member
                                          • Sep 2015
                                          • 76
                                          • USA

                                          #40
                                          Re: Vertical lines, kdl-40lx900, i susect tcon

                                          btw. i am still not sure if the problem is from the tcon or on the mainboard, maybe somebody can help me to check the mainboard, somehow, there are schematics of the mainboard in the PDF from post #10 https://www.badcaps.net/forum/showpo...5&postcount=10 the actiual PDF> https://www.badcaps.net/forum/attach...8&d=1447079878 i dont really understand it and if it is even possible to test somehow

                                          Comment

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