Sony KDL46S4100 backlight not working

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  • horn1991
    Member
    • Jul 2012
    • 12
    • USA
    #1

    Sony KDL46S4100 backlight not working

    This TV was given to me by my brother. It quit working on him one day, and he just went and bought a new one.

    I've searched and researched quite a bit so far. I decided to go for it and try a new main A board.

    With it all hooked up, still no picture. I turn the TV on, and the green power light is solid.

    If I unplug CN303 with the power on, the TV cycles through a green screen, a blue screen, a red screen, and then a striped screen. The striped screen is one quarter red horizontally, one quarter blue, one quarter green, and one quarter gray.

    When I plut the connector in, the backlight goes off.

    Any advice, thanks.

    Dave
    Tags: None
    • anmol
      Senior Member
      • Mar 2012
      • 73
      • India
      #2
      Re: Sony KDL46S4100 backlight not working

      check inverter board

        Comment

        • tibimakai
          Badcaps Legend
          • Jan 2012
          • 3680
          • USA
          #3
          Re: Sony KDL46S4100 backlight not working

          No blinking LED?

            Comment

            • horn1991
              Member
              • Jul 2012
              • 12
              • USA
              #4
              Re: Sony KDL46S4100 backlight not working

              nope, no blinking LED.

              Not sure how to check the inverter board. I'll need to look that up.

                Comment

                • Mr Bill
                  Badcaps Veteran
                  • Nov 2011
                  • 648
                  • USA
                  #5
                  Re: Sony KDL46S4100 backlight not working

                  If you get everything hooked up where it will turn on (solid led), take a flashlight and shine it directly on the screen in a very dark room and see if you can find "no signal". I usually shine the light towards the bottom of the screen and hit the volume key in the keyboard.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: Sony KDL46S4100 backlight not working

                      The inverter is working, otherwise you will not see it cycles through the RED/BLUE/GREEN screen.
                      It sounds like it's stucked in the test mode.
                      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

                        • horn1991
                          Member
                          • Jul 2012
                          • 12
                          • USA
                          #7
                          Re: Sony KDL46S4100 backlight not working

                          yeah...it can definitely create a picture of some sort. The main board was damaged from a small water leak. just a few drops, but enough to foul several components.

                          I bought a new main board online...TSM electronics or something. Anyway, the cycling RGB occurred with the new board. But upon further inspection, I think they sent me the wrong part.

                          I've since sent it back, and hope to have the correct board sometime next week. Hopefully that will get it back to working.

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Sony KDL46S4100 backlight not working

                              With the old board, does it cycle test patterns as well? Accessing the service manual may give an option for turning off the test mode, or you can try resetting the EEPROM, a similar trick done on Samsung LCD TVs.
                              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

                                • horn1991
                                  Member
                                  • Jul 2012
                                  • 12
                                  • USA
                                  #9
                                  Re: Sony KDL46S4100 backlight not working

                                  no...the old board did not cycle anything. With the CN303 plugged in, the screen was dark. Unplugging CN303 on the old board would bring up the backlight, but not any color cycling.

                                    Comment

                                    • Silviyius
                                      Member
                                      • Jun 2012
                                      • 29
                                      • US
                                      #10
                                      Re: Sony KDL46S4100 backlight not working

                                      You might be able to program the board if its the wrong one. might be a pain but you could do it. assuming you have the tools. What board is it?
                                      Last edited by Silviyius; 07-14-2012, 06:08 PM.

                                        Comment

                                        • horn1991
                                          Member
                                          • Jul 2012
                                          • 12
                                          • USA
                                          #11
                                          Re: Sony KDL46S4100 backlight not working

                                          appreciate the offer...but I already sent it back. Found the correct board somewhere else (hopefully, if they send what I ordered). Cheaper, too.

                                          I am a firm believer that the simplest explanation is the solution. I have a damaged Main Board from a water. No other damage is apparent. The correct main board should heal the TV. :-)

                                            Comment

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