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Samsung UE26D4003BW stand-by light blinking

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    Samsung UE26D4003BW stand-by light blinking

    Hi!


    I've had this TV collecting dust on shelf for a while now, thought i'd give it another look. When i last time worked on it, main board was suspected faulty.
    Thought i'd post this here to be sure.

    The symptoms are: stand-by light flashing 6 times when plugging the TV in. Nothing comes up and no reaction from the buttons. Caps on the SMPS board seem to be ok.
    Also backlight does turn on when mainboard is disconnected.
    Attached Files
    Last edited by Pappel; 11-10-2014, 08:59 AM. Reason: adding pictures

    #2
    Re: Samsung UE26D4003BW stand-by light blinking

    I want to try resetting the eeprom, but i'm having trouble identifying the eeprom chip, does seem like it's the "Winbond 25X40BVSIG 1143" (marked with red) or the "ATMLH142 2ECL Y 1G8213" that also seems to have 4 debugging connectors on top of it (marked with yellow).
    Attached Files
    Last edited by Pappel; 11-10-2014, 10:13 AM.

    Comment


      #3
      Re: Samsung UE26D4003BW stand-by light blinking

      That is not an EEPROM, it's an SPI flash. It cannot be "reset"
      With main board power cable out, check PSU voltages, all good?
      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


        #4
        Re: Samsung UE26D4003BW stand-by light blinking

        Whoops! wrong thread! (edited)

        If you are getting back lights with the main disconnected then its either mainboard or t-con, but this unit looks like the T-con is built into the panel itself so I would bet its a bad mainboard.


        Also blinking power LED on Samsungs means nothing :P
        Last edited by Shinju; 11-10-2014, 11:40 AM.

        Comment


          #5
          Re: Samsung UE26D4003BW stand-by light blinking

          measured the voltages:

          1. B13V - 12.81V _____ 2. PWM_DIM - 3.01V
          3. B13V - 12.81V _____ 4. N. C/LCD : H -- Sync - 0V
          5. Vamp - 12.81V _____ 6. BLU On/Off - 2.1V
          7. Vamp 12.81V _____ 8. GND
          9. GND _____ 10. GND
          11. B5V - 5.18V _____ 12. A5V - 5.18V
          13. B5V - 5.18V _____ 14. Power On/Off - 3.07V

          Comment


            #6
            Re: Samsung UE26D4003BW stand-by light blinking

            Well, the BL ON/OFF command is there... so the backlight SHOULD turn on.
            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


              #7
              Re: Samsung UE26D4003BW stand-by light blinking

              yes, psu was disconnected from the mainboard and the backlight was on

              Comment


                #8
                Re: Samsung UE26D4003BW stand-by light blinking

                Does the back light come on with the main connected but the lvds cable
                disconnected.
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment


                  #9
                  Re: Samsung UE26D4003BW stand-by light blinking

                  if by lvds cable you mean the one from mainboard to t-con, then disconnecting this and leaving mainboard connected to psu doesn't make a difference, same blinks, no backhlight or any sign of life

                  Comment


                    #10
                    Re: Samsung UE26D4003BW stand-by light blinking

                    Originally posted by Pappel View Post
                    measured the voltages:

                    1. B13V - 12.81V _____ 2. PWM_DIM - 3.01V
                    3. B13V - 12.81V _____ 4. N. C/LCD : H -- Sync - 0V
                    5. Vamp - 12.81V _____ 6. BLU On/Off - 2.1V
                    7. Vamp 12.81V _____ 8. GND
                    9. GND _____ 10. GND
                    11. B5V - 5.18V _____ 12. A5V - 5.18V
                    13. B5V - 5.18V _____ 14. Power On/Off - 3.07V
                    Are these Voltage readings taken without the cable connected between the power supply board and the main 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


                      #11
                      Re: Samsung UE26D4003BW stand-by light blinking

                      yes, that cable was disconnected

                      Comment


                        #12
                        Re: Samsung UE26D4003BW stand-by light blinking

                        At this point then we know the power supply and the backlights are OK, but when you have the main board connected the PS_ON is not HI anymore, so you do have main board problem.
                        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


                          #13
                          Re: Samsung UE26D4003BW stand-by light blinking

                          Bud, don't Samsung boards use inverted PS ON so a LOW signal is ON, and a HIGH signal is OFF? (Of course Samsung could have changed it for these models...)
                          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


                            #14
                            Re: Samsung UE26D4003BW stand-by light blinking

                            Measured the voltages of the regulators on mainboard:


                            1. 1117Z 1139DG (pin1 - 0.26V, pin2 - 1.51V, pin3 - 3.26V)
                            2. N434 950T45 (pin1 - 3.27V, pin2 - 0V, pin3 - 2.5V)
                            3. 78M09A (pin1 - 12.75V, pin2 - 0V, pin3 - 8.85V)
                            4. KIA 7805AF 127 (pin1 - 8.84V, pin2 - 0V, pin3 - 4.98V)
                            Attached Files

                            Comment


                              #15
                              Re: Samsung UE26D4003BW stand-by light blinking

                              Can you do the voltage tests on the power supply to main again with everything connected.
                              Please upload pictures using attachment function when ask for help on the repair
                              http://www.badcaps.net/forum/showthread.php?t=39740

                              Comment


                                #16
                                Re: Samsung UE26D4003BW stand-by light blinking

                                measured with everything connected:

                                1. B13V - 12.82V _____ 2. PWM_DIM - 0.08V
                                3. B13V - 12.82V _____ 4. N. C/LCD : H -- Sync - 0V
                                5. Vamp - 12.83V _____ 6. BLU On/Off - 0.04V
                                7. Vamp - 12.83V _____ 8. GND
                                9. GND _____ 10. GND
                                11. B5V - 5.17V _____ 12. A5V - 5.17V
                                13. B5V - 5.17V _____ 14. Power On/Off - 3.30V
                                Last edited by Pappel; 11-11-2014, 05:00 AM. Reason: typo

                                Comment


                                  #17
                                  Re: Samsung UE26D4003BW stand-by light blinking

                                  Ok, could you use a resistor from 100-470 ohms in value and connect PS-ON to GND? Then see if 13V/5V go away.
                                  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


                                    #18
                                    Re: Samsung UE26D4003BW stand-by light blinking

                                    yes they disappear, only A5V stays at 5.18V

                                    Also the standby light blinking pattern is different

                                    Comment


                                      #19
                                      Re: Samsung UE26D4003BW stand-by light blinking

                                      I noticed the heatsink on the vpu gets very hot, is it suppose to get that hot?

                                      Comment


                                        #20
                                        Re: Samsung UE26D4003BW stand-by light blinking

                                        It's late but if someone still needs a solution then they should know that the led bar is broken and the circuit breaker protection is working. It is difficult to find the led bar for this size 26 ".

                                        Comment

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