No Picture on Samsung LE46A55P4f

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  • Mikeyboy2007
    Badcaps Veteran
    • Mar 2013
    • 745
    • Scotland

    #1

    No Picture on Samsung LE46A55P4f

    hi guys got another one of samsungs tvs here with yet another fault. the tv switches on etc so do the backlights, but is not displaying any picture whatsoever has anyone else had same problem with this tv as a google search turned up no results at all...
  • Caleb
    Smokin IC's
    • Feb 2013
    • 645
    • USA

    #2
    Re: No Picture on Samsung LE46A55P4f

    Have you checked the fuse on the tcon?
    Liberating magic smoke one part at a time

    Comment

    • Mikeyboy2007
      Badcaps Veteran
      • Mar 2013
      • 745
      • Scotland

      #3
      Re: No Picture on Samsung LE46A55P4f

      no i will check just now and post result.

      Comment

      • Mikeyboy2007
        Badcaps Veteran
        • Mar 2013
        • 745
        • Scotland

        #4
        Re: No Picture on Samsung LE46A55P4f

        with multimeter on 20v one way reads -0.01v and other reads 0.02v

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: No Picture on Samsung LE46A55P4f

          So there is no 12V on either end of the fuse on the T-CON then, the main board supplies the 12V through a switched MOSFET close to the pin on the LVDS cable that supplies the voltage.
          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

          • Mikeyboy2007
            Badcaps Veteran
            • Mar 2013
            • 745
            • Scotland

            #6
            Re: No Picture on Samsung LE46A55P4f

            is it the thing i have circled ? am i better off replacing this then ?.
            Attached Files

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: No Picture on Samsung LE46A55P4f

              It could be that, or any number of devices..
              What is correct model # as there needs to be an additional digit after "55".
              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

              • Mikeyboy2007
                Badcaps Veteran
                • Mar 2013
                • 745
                • Scotland

                #8
                Re: No Picture on Samsung LE46A55P4f

                sorry Tom66 its LE46A559P4F

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: No Picture on Samsung LE46A55P4f

                  Can you post well focused picture of that section again? see post 6.
                  You can check the resistance between the fuse on the T-CON board to one of the 3 pins of that device, one of the 3 pins should have less than one Ohm reading if it is the switched MOSFET for the B+ feeding the T-CON board.
                  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

                    #10
                    Re: No Picture on Samsung LE46A55P4f

                    Try and see if you can get sound from TV - could be bad main board.
                    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

                    • Mikeyboy2007
                      Badcaps Veteran
                      • Mar 2013
                      • 745
                      • Scotland

                      #11
                      Re: No Picture on Samsung LE46A55P4f

                      Tom66 i am getting sound. also when i switch it to that channel its as if there is trying to display on screen but just see lines streaming from top and dimming further down screen

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: No Picture on Samsung LE46A55P4f

                        When you get those lines check the tcon voltages.
                        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

                        • Mikeyboy2007
                          Badcaps Veteran
                          • Mar 2013
                          • 745
                          • Scotland

                          #13
                          Re: No Picture on Samsung LE46A55P4f

                          tom66 i will make short video and upload to youtube and post link so you can see what i am meaning.

                          Comment

                          • Mikeyboy2007
                            Badcaps Veteran
                            • Mar 2013
                            • 745
                            • Scotland

                            #14
                            Re: No Picture on Samsung LE46A55P4f

                            Tom66 made this short video for you to see, i also have a 32" toshiba displaying same content which i have quickly shown..

                            http://www.youtube.com/watch?v=dsmLZ...ature=youtu.be

                            Comment

                            • Mikeyboy2007
                              Badcaps Veteran
                              • Mar 2013
                              • 745
                              • Scotland

                              #15
                              Re: No Picture on Samsung LE46A55P4f

                              Tom66 how do i check the T-Con voltages

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: No Picture on Samsung LE46A55P4f

                                The fuse voltage.

                                Looks to me like you were not testing fuse voltage correct - that looks like (another) bad panel to me. You can't get that with zero voltage at the T-con board. Small chance of tab bonds fault.

                                You can try checking VGH/VGL or VONE/VOFFE voltages, but for that, a pic of T-con is necessary.
                                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

                                • Mikeyboy2007
                                  Badcaps Veteran
                                  • Mar 2013
                                  • 745
                                  • Scotland

                                  #17
                                  Re: No Picture on Samsung LE46A55P4f

                                  tom camera is shit. the board installed is T460HW02 V0 CTRL BD

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: No Picture on Samsung LE46A55P4f

                                    Don't wish to sound rude but if you fix a lot of TVs buy a decent camera. I bought a Samsung PL120 at a CeX for £45.00; it takes excellent macro stills for a compact. Good lighting and use of sunlight can help too. I'm also impressed with how good the camera is on my old-generation smartphone, a Galaxy S2.

                                    Problem with online board photos is we can't spot obvious faults (burn components/cold joints - selldoor is excellent at this) or there are minor differences between boards/layouts/components.
                                    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

                                    • Mikeyboy2007
                                      Badcaps Veteran
                                      • Mar 2013
                                      • 745
                                      • Scotland

                                      #19
                                      Re: No Picture on Samsung LE46A55P4f

                                      Originally posted by tom66
                                      Don't wish to sound rude but if you fix a lot of TVs buy a decent camera. I bought a Samsung PL120 at a CeX for £45.00; it takes excellent macro stills for a compact. Good lighting and use of sunlight can help too. I'm also impressed with how good the camera is on my old-generation smartphone, a Galaxy S2.

                                      Problem with online board photos is we can't spot obvious faults (burn components/cold joints - selldoor is excellent at this) or there are minor differences between boards/layouts/components.
                                      hi will get a camera. i got samsung galaxy tab 3 and a lenovo tab both with camera but pretty crap lighting

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: No Picture on Samsung LE46A55P4f

                                        There's a pretty powerful light available between the hours of 7 am and 5 pm most days. Works quite well.
                                        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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