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    #21
    Re: Samsung LE32M51B S black screen

    On the input side of the CP101 I have 0.24V WTF?! Soldering a temporary bridge on the CP101 didn't do the work.

    Comment


      #22
      Re: Samsung LE32M51B S black screen

      So do you get the 12V on the input side of the fuse? The TV is on when you make the measurement?
      If there is no 12V on the input side of the pin then the main board is not sending the Voltage to run the T-CON.
      On the input side of the CP101 I have 0.24V WTF?!
      I have this Tv and I found the fuse to give a reading of about 70 ohms, simply removing it and replacing with a temporary solder bridge rectified the issue, I'm not saying this will help you but your symptoms are pretty much what I was having.
      Soldering a temporary bridge on the CP101 didn't do the work.
      The blue s/n sticker to the left of the LVDS connector looks melted on one end, is there anything obvious around that area?
      It looks melted because I reballed this part of the PCB.

      Comment


        #23
        Re: Samsung LE32M51B S black screen

        I think you would have to say, if you have 0.25v @ V-in and 0.24v on the input side of the fuse, then this may point to an output problem with the main board, try to find which pins output the 12v feed and take some measurements, with both the LVDS cable connected and disconnected, let us know what you find, some close ups of both the front and rear of the main board would be useful.

        Comment


          #24
          Re: Samsung LE32M51B S black screen

          Just out of curiosity, what was it that you reballed and why?

          Comment


            #25
            Re: Samsung LE32M51B S black screen

            maybe try a different mainboard.

            Comment


              #26
              Re: Samsung LE32M51B S black screen

              I am stuck guys... obviously the mainboard is not sending 12V to the T-CON... I did some measurments from the mainboard to the T-CON and the voltage is 0.24V. Do you have any idea what can cause the problem?

              Just out of curiosity, what was it that you reballed and why?
              I was hoping there is a loose connection on the T-CON. That is why
              Last edited by intenzive; 02-04-2015, 04:59 PM.

              Comment


                #27
                Re: Samsung LE32M51B S black screen

                You will need to locate the switched MOSFET that supplies the 12V to the T-CON fuse when the processor sends out the on command to turn on the switched MOSFET.
                We will need really really good clear pictures around the LVDS connector on the main board to see if we can locate the MOSFET.
                You should also try removing the LVDS cable from the main board and check and see if the power pins on the LVDS will have 12V.
                You can also check the resistance between the chassis and the T-CON fuse to see if it shows very low resistance.
                Last edited by budm; 02-04-2015, 05:04 PM.
                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


                  #28
                  Re: Samsung LE32M51B S black screen

                  OK. Here are some good photos of the mainboard near LVDS connector front and back:
                  Attached Files

                  Comment


                    #29
                    Re: Samsung LE32M51B S black screen

                    What is the P/N of that IC 805 to the right of the LVDS connector?
                    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


                      #30
                      Re: Samsung LE32M51B S black screen

                      looks like you have 5 fuses there by the connector, did you check those?

                      Comment


                        #31
                        Re: Samsung LE32M51B S black screen

                        Those 5 'FT' are Ferrite beads.
                        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


                          #32
                          Re: Samsung LE32M51B S black screen

                          Originally posted by budm View Post
                          what is the p/n of that ic 805 to the right of the lvds connector?
                          ic 805 - 9933b w548

                          Comment


                            #33
                            Re: Samsung LE32M51B S black screen

                            MOSFET FDS9933.
                            Put the LVDS cable back in place then check the resistance between either end of the SMD fuse on the T-CON against pin 1 through pin 8 to see if any one of those pins have direct connection to the fuse on the T-CON.
                            Attached Files
                            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


                              #34
                              Re: Samsung LE32M51B S black screen

                              Originally posted by budm View Post
                              MOSFET FDS9933.
                              Put the LVDS cable back in place then check the resistance between either end of the SMD fuse on the T-CON against pin 1 through pin 8 to see if any one of those pins have direct connection to the fuse on the T-CON.
                              I have direct connection between the fuse on t-con and the MOSFET on pins 7 and 8 on both sides of the fuse.

                              Comment


                                #35
                                Re: Samsung LE32M51B S black screen

                                Originally posted by budm View Post
                                Those 5 'FT' are Ferrite beads.
                                oh, ok, didnt think they looked like fuses.

                                Comment


                                  #36
                                  Re: Samsung LE32M51B S black screen

                                  Oh, and someting else I measured the voltage on pins 1 and 2 and it's around 6.35V if this matters. On pins 7 and 8 which are directly connected with the fuse on the t-con I have the same voltage 0.24V
                                  Last edited by intenzive; 02-06-2015, 10:24 AM.

                                  Comment


                                    #37
                                    Re: Samsung LE32M51B S black screen

                                    OK so that FDS9933 DUAL P-CH MOSFET, and it is the switched MOSFET for feeding the B+ to the T-CON.
                                    You also need to take the reading without the LVDS cabel connected to the T-CON to see what you have on pin 7/8 (Drain D2).
                                    I need Voltage reading of all 8 pins when TV is OFF and when TV is ON.
                                    Per spec sheet of the LCD panel LTA320W2-L03, the typical DCV for the T-CON is 5VDC.
                                    Attached Files
                                    Last edited by budm; 02-06-2015, 10:57 AM.
                                    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


                                      #38
                                      Re: Samsung LE32M51B S black screen

                                      Well finally I took the measurments as you adviced me to do and here are the results:
                                      Attached Files

                                      Comment


                                        #39
                                        Re: Samsung LE32M51B S black screen

                                        up

                                        Comment


                                          #40
                                          Re: Samsung LE32M51B S black screen

                                          Originally posted by intenzive View Post
                                          up
                                          What does that mean?
                                          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

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