LN-32A550P3F No screen and squealing

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  • dcapper
    Badcaps Veteran
    • Dec 2013
    • 496
    • Canada
    #1

    LN-32A550P3F No screen and squealing

    The blue Samsung led in the center at the bottom lights up and the red power light blinks but no backlight. Then after a few seconds, it starts to squeal. I changed all the power supply caps even though they were not bulged. I metered the coils on the inverter board, and all reading fine. So I found another mainboard that I had. I installed it and went into the service menu to change it to the model I that I am working on. Well now the tv turns on, it doesn't squeal and I get video except the video is red. Is the tcon bad?
    Attached Files
    Last edited by dcapper; 03-16-2020, 12:38 AM.
    Tags: None
    • neilc6
      Badcaps Legend
      • Nov 2015
      • 1550
      • Canada
      #2
      Re: LN-32A550P3F No screen and squealing

      Search C102 in the forums since this cap on the main board can cause squealing and green screen.

        Comment

        • dcapper
          Badcaps Veteran
          • Dec 2013
          • 496
          • Canada
          #3
          Re: LN-32A550P3F No screen and squealing

          But I replaced the main board and now I have a red screen. Should I find an old Samsung mainboard and replace C102 on the board I pulled out?

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9535
              • Canada
              #4
              Re: LN-32A550P3F No screen and squealing

              It could be a mismatch between the main board and t-con, or it could be a service menu setting that is still wrong. Check the other settings in the service menu IE: LVDS OUT Format, Panel Option.

              The cap at location C102 is only on a certain main boards, not all of them.

              This thread has pictures of the main board and the model: https://www.badcaps.net/forum/showth...highlight=c102
              Attached Files
              Last edited by R_J; 03-16-2020, 11:43 AM.

                Comment

                • dcapper
                  Badcaps Veteran
                  • Dec 2013
                  • 496
                  • Canada
                  #5
                  Re: LN-32A550P3F No screen and squealing

                  I wish I knew what the original settings were. I'm going to look at some old Samsung mainboards I have laying around and change the cap on the original board.

                    Comment

                    • dcapper
                      Badcaps Veteran
                      • Dec 2013
                      • 496
                      • Canada
                      #6
                      Re: LN-32A550P3F No screen and squealing

                      Do these settings look right? Maybe I'm missing something.
                      Attached Files

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12141
                          • U.S.
                          #7
                          Re: LN-32A550P3F No screen and squealing

                          Too hard to see the settings, it's sideways.

                            Comment

                            • dcapper
                              Badcaps Veteran
                              • Dec 2013
                              • 496
                              • Canada
                              #8
                              Re: LN-32A550P3F No screen and squealing

                              I know I'm trying to set it straight. Let me repost.
                              Attached Files
                              Last edited by dcapper; 03-16-2020, 04:23 PM.

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12141
                                  • U.S.
                                  #9
                                  Re: LN-32A550P3F No screen and squealing

                                  Maybe the LVDS out format, make note of what it is now, see if you can change it, on some when you change it the picture clears up and you can see it right then.

                                    Comment

                                    • dcapper
                                      Badcaps Veteran
                                      • Dec 2013
                                      • 496
                                      • Canada
                                      #10
                                      Re: LN-32A550P3F No screen and squealing

                                      I ended up doing Budm's mod on the original board from the other thread. The tv is working perfectly now! The only difference I see is the 32A CV vs. 32A C and Gamma .95 vs. .90
                                      Attached Files

                                        Comment

                                        • R_J
                                          Badcaps Legend
                                          • Jun 2012
                                          • 9535
                                          • Canada
                                          #11
                                          Re: LN-32A550P3F No screen and squealing

                                          So are you saying that your main board DID have the cap at C102?

                                            Comment

                                            • dcapper
                                              Badcaps Veteran
                                              • Dec 2013
                                              • 496
                                              • Canada
                                              #12
                                              Re: LN-32A550P3F No screen and squealing

                                              Yes the original one had the cap so I did the Budm mod. I tried replacing the mainboard originally with one I had but I got the red screen. I couldn't get rid of the red screen so I tried the mod and it worked.

                                                Comment

                                                • budm
                                                  Badcaps Legend
                                                  • Feb 2010
                                                  • 40746
                                                  • USA
                                                  #13
                                                  Re: LN-32A550P3F No screen and squealing

                                                  Just for FYI about NEC Tantalum caps used on Samsung main board:
                                                  https://www.badcaps.net/forum/showth...sung+LN52A650A
                                                  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

                                                    • nomoresonys
                                                      Badcaps Legend
                                                      • Jan 2013
                                                      • 12141
                                                      • U.S.
                                                      #14
                                                      Re: LN-32A550P3F No screen and squealing

                                                      Oh, ok, I read it as neither of your boards had c 102.

                                                        Comment

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