Sony KDL-40SL140 way too bright

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  • billydanger
    Member
    • Feb 2014
    • 15
    • USA
    #1

    Sony KDL-40SL140 way too bright

    Ok, stay with me:

    1. originally had solarized picture and so I replaced the TCON board.
    2. After replacement I got nothing but a blank screen. Backlight was on but that was all.
    3. after much searching and probing I found an open fuse on the mainboard that I must have popped somehow.
    4. Replaced fuse and all functionality returned EXCEPT the screen is now really bright. Not like I have a supercharged backlight but more like the brightness is turned all the way up (which it isn't). Picture is not solarized like before TCON replacement, just too bright.

    Eventually (10-15 minutes) screen will fade back down to near-normal brightness level and then return to high brightness after a few more minutes. Process repeats until I get sick of looking at it.

    The mainboard fuse was F4001 (24V, 5A) and is in-line with IC number Q4018 (UPA1716G-E2). The schematic is shown in service manual page 44.

    Thoughts?
    Attached Files
    Tags: None
    • Andrew F. Ali
      Badcaps Legend
      • Jan 2014
      • 2450
      • Trinidad & Tobago
      #2
      Re: Sony KDL-40SL140 way too bright

      Adjusting the Contrast and Brightness did not help?....There might be a Backlight adjustment in the Main Menu. too....Turn them down.

        Comment

        • billydanger
          Member
          • Feb 2014
          • 15
          • USA
          #3
          Re: Sony KDL-40SL140 way too bright

          Adjusting the usual options doesn't seem to help much. I can get it close to something resembling a decent picture but it just returns to the "super bright" display after a few minutes.

          Also, I wiggled cables and TCON ribbon cables, as well as used a heat gun around the edge of the screen to look for bonding issues but I was never able to find anything.

            Comment

            • billydanger
              Member
              • Feb 2014
              • 15
              • USA
              #4
              Re: Sony KDL-40SL140 way too bright

              I tried to take a little video with my phone but naturally the TV is playing just fine right now. Maybe later...

                Comment

                • billydanger
                  Member
                  • Feb 2014
                  • 15
                  • USA
                  #5
                  Re: Sony KDL-40SL140 way too bright

                  I replaced the AS15 chip on the "new" TCON board that I bought and that seems to have done the trick. Colors are still a little bit off but I think that can be fixed with proper adjustments.

                  So. Fixed. Bad TCON board as was the original diagnosis.

                    Comment

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6642
                      • Wales
                      #6
                      Re: Sony KDL-40SL140 way too bright

                      Disappointing that you had to repair the replacement Tcon but looks as though you've nailed it. Well done
                      Willing to help but I'm no expert.

                        Comment

                        • Hamie
                          Badcaps Legend
                          • Apr 2014
                          • 1383
                          • UK
                          #7
                          Re: Sony KDL-40SL140 way too bright

                          You may still have an issue with the gamma chip. Maybe one leg not quite soldered properly.

                          Many people including myself have had issues with brand new chips being faulty straight out the box.

                          Check your gamma voltages.

                            Comment

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