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Sony KDL-55W809C - solarization + brightness

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    Sony KDL-55W809C - solarization + brightness

    I have Sony KDL-55W809C TV and here is short history of problem that I have:
    - 10 months ago, when TV was 5 months old it started to have solarization problem when cold. Blacks were green, lots of purple, some inverted colors.
    It was sent to service under warranty (very complicated procedure that lasts 2 months, due to the fact the TV was bought in another country) but as they said they could not replicate the problem when the set arrived there. When they returned it, it was working fine. I thought it was some loose contact, which most likely was.
    - 30 days ago, the issue returned and it gradually got worse, first solarization was for only 1-2 minutes from turning on and in 10 days it stayed for 1 hour, maybe even more.
    - Due to the complicated procedure of sending the TV to service center which will accept it under warranty and with previous experience (possibly bad contact) I've disassembled it and reseated TCon cables (all 3). Problem disappeared and TV was working OK again (no solarization).
    - Then I've noticed that edges of the screen are very bright and that in area of cca 4cm (1,5 inch) there is some burn-in from previous content. Also the entire screen is very bright, even with brightness turned all the way down, as well as gamma in settings.
    - Service mode/WB setting says 512 on all 6 points.
    - After the TV was off for about 4 days (we were not at home), on first start there were darker vertical lines/areas of cca 10cm (5 inches) flashing, where the image would seem as it should (not so bright). Those lines appeared and disappeared for about 15 minutes when finally they were all gone and the screen was bright again.
    - I've ordered and installed new main board to TCon board cable, because the old one did not look so good (picture of TCon with it in attachment), but the screen is still bright.
    - I've also ordered used TCon board which is currently on route (before reseating the cables). The board is the same (code printed on the board itself), but the barcode is not the same as on my board, so my question is will it work? It is from the same model of TV, as the seller stated.

    Also, what can cause burn-in and those darker vertical areas and in general those problems that I've described?
    Attached Files

    #2
    Re: Sony KDL-55W809C - solarization + brightness

    Any thoughts from anyone?

    Comment


      #3
      Re: Sony KDL-55W809C - solarization + brightness

      No one still?

      Comment


        #4
        Re: Sony KDL-55W809C - solarization + brightness

        Did t-con fix problem?
        I assume no responsibility for any stupid suggestions I might post.

        Comment


          #5
          Re: Sony KDL-55W809C - solarization + brightness

          It may well be that the PWM signal controlling the backligh level is at fault.
          Have you measured it and also if you adjust the backlight level does the PWM signal change?
          Last edited by dick_barton; 07-12-2017, 12:26 PM.
          Willing to help but I'm no expert.

          Comment


            #6
            Re: Sony KDL-55W809C - solarization + brightness

            Originally posted by dskall View Post
            Did t-con fix problem?
            New (used) one did not arrive still. Seller refunded the cost and because there were no tracking info, so I'm still waiting for a few days and then will be ordering another.

            Originally posted by dick_barton
            It may well be that the PWM signal controlling the backligh level is at fault.
            Have you measured it and also if you adjust the backlight level does the PWM signal change?
            I did not measure it and to be honest I'm not sure I could without some detailed explanation, but I am willing to try of course.
            The thing I noticed that brightness setting as well as gamma have very little impact when turned all the way down.


            Forgot to mention that the picture is quite OK when TV is just booted, but as it warms up it gradually gets worse (brighter). Also if the content has dark stripes on top/bottom edges there is no light bleeding there. Also, after warming up image retention problem appears.
            Last edited by voonica; 07-13-2017, 03:50 AM. Reason: added last paragraph

            Comment


              #7
              Re: Sony KDL-55W809C - solarization + brightness

              Originally posted by voonica View Post
              New (used) one did not arrive still. Seller refunded the cost and because there were no tracking info, so I'm still waiting for a few days and then will be ordering another.



              I did not measure it and to be honest I'm not sure I could without some detailed explanation, but I am willing to try of course.
              The thing I noticed that brightness setting as well as gamma have very little impact when turned all the way down.


              Forgot to mention that the picture is quite OK when TV is just booted, but as it warms up it gradually gets worse (brighter). Also if the content has dark stripes on top/bottom edges there is no light bleeding there. Also, after warming up image retention problem appears.
              Hi , can't help you with fault finding this one. got a 50W700B I'm battling and looks very much like bad / shorted panel for me.

              With the TCon though, I made a mistake and got one from a W800B and mainboard rejected it with a blinking green/amber light.

              I would try and be sure the numbers match. My original had FX-5550T20C08, replacement was FX-5550T20C01.

              Apart from that the board was very similar. I found swapping the eeproms, in particualar the small 8 pin next to the TCON LVDS cable input got it going and produced an image for a moment and then failed, suspect panel damaged the TCON.

              This info may prove handy if you replace the tCON and it does not turn on with that amber / green blink.

              good luck

              Comment


                #8
                Re: Sony KDL-55W809C - solarization + brightness

                T-con voltages (typical)
                1. Vin (Vcc): 12Vdc or 5Vdc
                2. Vlogic,LCM, Vddd,VCC): 3.3Vdc
                3. Vda (Vs, Vsource,VDD, Vdda,Avdd): 14Vdc~20Vdc
                4. Vgh (Vgon,VGHR, Von, Vddg): 20Vdc~30Vdc
                5. Vgl (Vgoff,VST,VGHF,VGHEVEN, Voff,Veeg): -5Vdc~-7Vdc
                6. HVDD about 8v
                7. DVDD,VDDC 3.3v, 1.2v
                8. VCOM about 5~10vd
                If you want to check t-con voltages
                I assume no responsibility for any stupid suggestions I might post.

                Comment


                  #9
                  Re: Sony KDL-55W809C - solarization + brightness

                  Update for future similar problems:

                  I changed T-Con (bought used one, same numbers on printed board and first 2+10 on bar code sticker) and everything is fine once again. No solarization, no image retention and brightness is working as it should once again.
                  Thanks everyone.

                  Comment


                    #10
                    Re: Sony KDL-55W809C - solarization + brightness

                    Thanks for update
                    I assume no responsibility for any stupid suggestions I might post.

                    Comment

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