Sony KDL-37S550 - bad image - not gamma chip but same effect

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  • noledud
    Badcaps Veteran
    • Dec 2013
    • 413
    • united kingdom

    #1

    Sony KDL-37S550 - bad image - not gamma chip but same effect

    Sony KDL-37S550

    Hi all got the above and after seeing the image i thought it was gamma chip on tcon - ( i didnt check just sent the board for repair )

    when it came back the fault was still there so my guy replaced the gamma chip again and he said it definitely tests good however i still have the fault

    my question is is there anything else that can fail on the tcon to cause this or could it even be the main ? or worse the panel ?

    My guy who replaces the gamma chip says there is another on the buffer that could be at fault ?
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

    You should take the DC Voltage of the GAMMA Voltage test points on the T-CON to se if they are normal or not. Your on screen user menu seems to look normal though.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

      My guy who replaces the gamma chip says there is another on the buffer that could be at fault ?
      I am not aware of any second chip.

      The fault looks identical to any gamma issue. I can't think of anything else that can cause it. The menus are two-tone, so maybe they don't show the effect well?

      It is possible the guy had a bad gamma chip twice. There are quite a few bad ones. Did you ask if he checked gamma voltages? Because that is really the only way to test it.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • noledud
        Badcaps Veteran
        • Dec 2013
        • 413
        • united kingdom

        #4
        Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

        Well I have just received another tcon and same issue so I doubt it's 3 different ones well 2 but replaced the gamma chip twice so in fact 4 tcon shave been tested

        What would you look at next ?

        I've tried gamma chips another tcon, moved all cables and freeze spray can't get the picture to change at all.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

          But have you tested the gamma voltages?
          That will tell you for sure.
          If you don't know how, post a picture of the T-con board.
          A surprising number of T-con boards are DOA with this fault.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • noledud
            Badcaps Veteran
            • Dec 2013
            • 413
            • united kingdom

            #6
            Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

            hi all

            ok im checking voltages now here are what i have on the full replacement TCON from fleebay (GRR or GRR_Price_attack)

            1 - 15.43
            2 - 15.18
            3 -
            4 - 12.56
            5 -
            6 - 10.81
            7 -
            8 - 10.12
            9 -
            10 -
            11 - 7.75
            12 - 6.81
            13 - 7.02
            14 -
            15 - 4.90
            16 -
            17 - 4.26
            18 -
            19 - 2.94
            20 -
            21 - 0.55
            22 - 0.31

            Now i cant find all the test point unless its me being blind - i have attached 2 pics if anyone can point out the rest

            but even with the missing results from what i have there is at least 1 spike so thats a bad gamma chip then i guess
            Attached Files

            Comment

            • noledud
              Badcaps Veteran
              • Dec 2013
              • 413
              • united kingdom

              #7
              Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

              Here is the original tcon that first had the fault and since had 2 gamma chips

              1 - 15.34
              2 - 14.94
              3 -
              4 - 12.73
              5 -
              6 - 10.85
              7 -
              8 - 9.91
              9 -
              10 - 7.95
              11 - 7.59
              12 - 6.51
              13 - 6.88
              14 -
              15 - 3.13
              16 -
              17 - 3.12
              18 -
              19 - 3.12
              20 -
              21 - 3.12
              22 - 0.29

              But while testing the points i caught the gamma chip and it sparked and burnt a hole in it now white screen ( it just gets better ! )

              When i first sent him the board he said he found some resistors with low values so he replaced them as well

              My theory is gamma chip burnt out / went bad as they do on these tcons

              i bought the set and sent the tcon for gamma chip when he also replaced "some resistors"

              I received it back and fault still there so sent it back to him to redo he sent it back again with another chip still tested bad - this is when he said it must be the buffer ?

              so i started the thread - after seeing tom agreed with me and its most likley gamma i decided to order another tcon

              then i was just unfortunate to receive DOA

              im thinking replacing the gamma on the new tcon should resolve does the above sound about right to you guys also ?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                Yes, that seems right.
                Replacing the chip, I found it was very difficult and I had to do it twice, had an overblown image both times.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • noledud
                  Badcaps Veteran
                  • Dec 2013
                  • 413
                  • united kingdom

                  #9
                  Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                  thanks tom , its turning into one of those TV's Β£10 here Β£15 there its creeping up not had any for a while then this so swings and roundabouts

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                    It is why I suggest replacing it yourself if you have the ability. No telling what the guy does, or if he tests his work.
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • noledud
                      Badcaps Veteran
                      • Dec 2013
                      • 413
                      • united kingdom

                      #11
                      Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                      It's the equipment I've got no hot hair station, do I need a uber expensive one or will a cheap ebay job do the trick ?

                      Comment

                      • noledud
                        Badcaps Veteran
                        • Dec 2013
                        • 413
                        • united kingdom

                        #12
                        Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                        Got the 2 tcons back

                        tried the first one last night ( ebay one tested bad gamma chip )

                        fault still there

                        didnt have time to check voltages but will post later after work

                        now my guy who replaces the gamma chips has never sent me a dud befor i got this set

                        i cant belive that all have been bad and done incorrectly, there must be something else effecting the picture and also the voltages on the tcon as i bet when i check later they will be out

                        now im thinking its the main as that feeds the tcon but what do you think ?

                        Comment

                        • flocko
                          Badcaps Legend
                          • Nov 2012
                          • 1121
                          • uk

                          #13
                          Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                          Hi Do all the T.con boards show the same bar code number ? the one shown in post 6 shows the part number (bar code) 5537T04C29 and is for the T315HW02 V7 panel your panel sticker shows it to be a T315HW02 V8 it could be a compatibility problem that you have Flocko

                          Comment

                          • noledud
                            Badcaps Veteran
                            • Dec 2013
                            • 413
                            • united kingdom

                            #14
                            Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                            Originally posted by flocko
                            Hi Do all the T.con boards show the same bar code number ? the one shown in post 6 shows the part number (bar code) 5537T04C29 and is for the T315HW02 V7 panel your panel sticker shows it to be a T315HW02 V8 it could be a compatibility problem that you have Flocko
                            It might be slightly different but should still be ok to use, however i have the original that was fitted in the TV and that gamma chip has been replaced but that also still has the fault

                            im really thinking main board but can that make the voltages read bad on the gamma ic ?

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                              No, a bad main board cannot cause the gamma voltages to read low on Sony LCD. Only Sharp LCD lets you adjust gamma voltages from service menu.

                              I suppose there's the modicum of a chance that it's panel related - but I really doubt it, as after seeing hundreds of gamma chip faults, they have all been fixed by a new AS15 or AS19 IC.

                              There isn't really anything more to suggest -- bad gamma voltages ultimately means something is wrong on the T-con and 99.9% of the time it'll be the gamma IC... the 0.1% is other odd faults but I would not even know where to start with those.
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                              Comment

                              • Andrew F. Ali
                                Badcaps Legend
                                • Jan 2014
                                • 2450
                                • Trinidad & Tobago

                                #16
                                Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                                Other important T-con typical dc voltages include:
                                1. vin (vcc) 5V or 12V
                                2. vdd (vlogic, vddd) 3.3V
                                3. vda (vs, vsource, vdda, avdd) 14V-20V
                                4. vgh (vgon, von, vddg) 20v-30v
                                5. vgl (vgoff, voff, veeg) 5V-7V
                                All five (5) dc voltages must be present on the T-con board for it to work properly.

                                Upon further investigation it was noted that there are a lot of cheaper chinese AS15 and AS19 Gamma chips on the market and that they aren't reliable. So your Tech and you by extension could be a victim of these cheaper unreliable chips.
                                My suggestion is to replace the T-con board all together.
                                Last edited by Andrew F. Ali; 09-10-2014, 11:43 AM. Reason: Further investigation

                                Comment

                                • noledud
                                  Badcaps Veteran
                                  • Dec 2013
                                  • 413
                                  • united kingdom

                                  #17
                                  Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                                  iv have done that, so i have 2 tcons both had bad gamma voltages so replaced gamma chips ( on of them has been done 3 times with differnt chip suppliers )

                                  but i still have the fault, to be the gamma chip on both and after a few replacments the odds would be massive

                                  has any one got a set that i could send them the tcons to test ? that way i rule them and the panel out ?

                                  Comment

                                  • noledud
                                    Badcaps Veteran
                                    • Dec 2013
                                    • 413
                                    • united kingdom

                                    #18
                                    Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                                    also will know more when i get new voltages tonight when home

                                    Comment

                                    • noledud
                                      Badcaps Veteran
                                      • Dec 2013
                                      • 413
                                      • united kingdom

                                      #19
                                      Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                                      hi all update tried the origianl tcon ( the one that has now had 3 gamma replacments )

                                      ITS WORKING

                                      so this is down to my tech doing the gamma chip incorrectly the first 2 times

                                      can some on give me a list of items / tools i need to buy so i can replace these my self ? as im not wanting to trust someone else again

                                      Cheers

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: Sony KDL-37S550 - bad image - not gamma chip but same effect

                                        Hmm. Or the chip was bad.

                                        I use a hot air gun to take them off... I believe you can get a decent one for about Β£70.

                                        Solder, flux, wick and a steady hand to put them on again.
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

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