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Samsung UE22ES5000 Led tv no standby

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    #1

    Samsung UE22ES5000 Led tv no standby

    Hi, I have limited knowledge of electronics and have no access to an oscilloscope. I am trying to fix my samsung tv, and would really appreciate any help I can get.
    So the board I am having trouble with is the BN44-00505B Power board. I have between 1.8 to 2.3 volts at the 5v reference points. I have detected and changed a faulty diode (DM861). I have also replaced any bad capacitors and the IC (ice3br1065jf). I am getting 330v from the rectifier. The output header pins are as follows:
    1-B13v
    2-EPWM
    3-B13v
    4-NC
    5-VAMP
    6-B-ON
    7-VAMP
    8-GND
    9-GND
    10-GND
    11-B5V
    12-A5V 1.8 TO 2.3
    13-B5V
    14-P-ON

    I am not getting any voltages from the pins except pin 12
    The chip on the back is a MAP3204C which I think is a LED driver.
    Any help would be very much appreciated.
    Alan.



    Attached Files
    Last edited by datalore44; 11-22-2018, 08:25 AM.
    Tags: None
    #2
    Re: Samsung UE22ES5000 Led tv no standby

    Wonder if you need RM859 resistor in place, did you have this tv working or did you receive it not working? you know history?
    Last edited by nomoresonys; 11-22-2018, 09:32 AM.

    Comment

      #3
      Re: Samsung UE22ES5000 Led tv no standby

      Hi. This is my tv. It was working fine then just died.

      Comment

        #4
        Re: Samsung UE22ES5000 Led tv no standby

        "12-A5V 1.8 TO 2.3"
        If you run the power supply board by itself and not connected to anything else, is A5V stable @5V?
        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

          #5
          Re: Samsung UE22ES5000 Led tv no standby

          No, it is exactly the same.

          Comment

            #6
            Re: Samsung UE22ES5000 Led tv no standby

            Check your diodes, go ahead and check m in circuit, if any don't check right, take it out of circiut and recheck it. https://www.youtube.com/watch?v=BXOS5czCb3Q
            Last edited by nomoresonys; 11-22-2018, 06:38 PM.

            Comment

              #7
              Re: Samsung UE22ES5000 Led tv no standby

              Already checked all diodes and replaced 1 faulty one. Also checked and changed any faulty caps.

              Comment

                #8
                Re: Samsung UE22ES5000 Led tv no standby

                Oops my bad, I see you did it in first post. Did you check your mosfets?
                Last edited by nomoresonys; 11-23-2018, 12:21 PM.

                Comment

                  #9
                  Re: Samsung UE22ES5000 Led tv no standby

                  I have checked the 3 mosfets on back of the board. I am confused by the small 3 pin packages marked ZDM, Q and QQ.

                  Comment

                    #10
                    Re: Samsung UE22ES5000 Led tv no standby

                    Anyone else have any ideas? Also I cannot find a circuit diagram anywhere. Does anyone know where else I could find one please.
                    Last edited by datalore44; 11-26-2018, 09:09 AM.

                    Comment

                      #11
                      Re: Samsung UE22ES5000 Led tv no standby

                      Did you replace CM808 capacitor?
                      What number diode did you use to replace DM861?
                      Check that QM861 is not shorted

                      Also what is the voltage measured at the cathode of DM861
                      Last edited by R_J; 11-26-2018, 11:51 AM.

                      Comment

                        #12
                        Re: Samsung UE22ES5000 Led tv no standby

                        What dc Voltage do you get if you measure between cold side circuit ground and the Cathode of DM861, 852, 881?
                        Last edited by budm; 11-26-2018, 01:46 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

                          #13
                          Re: Samsung UE22ES5000 Led tv no standby

                          Originally posted by R_J View Post
                          Did you replace CM808 capacitor?
                          What number diode did you use to replace DM861?
                          Check that QM861 is not shorted

                          Also what is the voltage measured at the cathode of DM861
                          Checked CM808 showing 50uf esr 0.14ohm vloss 0.8% I assume that is within tolerances.
                          The diode DM861 was a direct replacement SR320
                          There is no short at QM861 (seems to test ok)

                          Comment

                            #14
                            Re: Samsung UE22ES5000 Led tv no standby

                            Originally posted by budm View Post
                            What dc Voltage do you get if you measure between cold side circuit ground and the Cathode of DM861, 852, 881?
                            DM861 5.4 to 6v
                            DM852 1.6 to 2.3v
                            DM881 9.1 to 9.4v

                            Comment

                              #15
                              Re: Samsung UE22ES5000 Led tv no standby

                              Thank you all very much for your help.
                              There seems to be a lot of unstable voltages changes going on.

                              Comment

                                #16
                                Re: Samsung UE22ES5000 Led tv no standby

                                If you remove one end of dm861, does your A5V come up? Was the original DM861 shorted (both directions)
                                Last edited by R_J; 11-26-2018, 04:12 PM.

                                Comment

                                  #17
                                  Re: Samsung UE22ES5000 Led tv no standby

                                  Originally posted by R_J View Post
                                  If you remove one end of dm861, does your A5V come up? Was the original DM861 shorted (both directions)
                                  Hi. If I remove the cathode end of the diode there is no voltage at the diode to ground. There is 1.18v on the pcb track where the diode connects and cold ground. The old diode was shorted in both directions.

                                  Comment

                                    #18
                                    Re: Samsung UE22ES5000 Led tv no standby

                                    The voltage I wanted you to check with DM861 removed was the A5V (cathode of DM852) By removing DM861, that will eliminate anything after that diode, so the A5v should come up. If it does'nt there could also be a high load on one of the other secondary lines or the primary side is not operating properly.
                                    have you checked RM803, DM802, ZDM803 & ZDM802? Also check JP831 0Ω near the cnm803 plug
                                    Last edited by R_J; 11-27-2018, 01:23 PM.

                                    Comment

                                      #19
                                      Re: Samsung UE22ES5000 Led tv no standby

                                      Originally posted by R_J View Post
                                      The voltage I wanted you to check with DM861 removed was the A5V (cathode of DM852) By removing DM861, that will eliminate anything after that diode, so the A5v should come up. If it does'nt there could also be a high load on one of the other secondary lines or the primary side is not operating properly.
                                      have you checked RM803, DM802, ZDM803 & ZDM802? Also check JP831 0Ω near the cnm803 plug
                                      So checked the voltage with diode removed and it is stable at 5.22v.
                                      0 ohm across the resistor jp831
                                      all components seemed to check out ok. I assume ZDM803 and 802 are a zener diode?
                                      Thank you for taking the time with this.

                                      Comment

                                        #20
                                        Re: Samsung UE22ES5000 Led tv no standby

                                        Those zeners are likely ok, if the A5V standby is working with DM861 removed, then I suspect there is something loading the circuit After the DM861.
                                        What is the resistance measured across CM864 and CM867?
                                        Last edited by R_J; 11-27-2018, 03:46 PM.

                                        Comment

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