Element ELCHW321 Catastrophic Failure

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #61
    Re: Element ELCHW321 Catastrophic Failure

    Yes, that is correct, just do not let the probe slip.
    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

    • Agent24
      I see dead caps
      • Oct 2007
      • 4913
      • New Zealand

      #62
      Re: Element ELCHW321 Catastrophic Failure

      Originally posted by budm
      do not let the probe slip.
      I also advise against any wandering probes - I already did that once myself.

      The resultant fireworks may give a good adrenaline rush but they are brief and expensive compared to contemporary gunpowder types and not really worth the lasting headache.
      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
      -David VanHorn

      Comment

      • mmartell
        Badcaps Legend
        • Oct 2013
        • 3189
        • Canada

        #63
        Re: Element ELCHW321 Catastrophic Failure

        I'm fairly confident I can do this with the probes as it's an 8-pin ic and only pin 4 is the gate. What kind of results am I looking for exactly ?

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #64
          Re: Element ELCHW321 Catastrophic Failure

          To see if it draw at 0.5A or more, you may see the current surge at the beginning then it should drop down below 0.5A.
          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

          • mmartell
            Badcaps Legend
            • Oct 2013
            • 3189
            • Canada

            #65
            Re: Element ELCHW321 Catastrophic Failure

            Well I'm not sure what to make of that test. I had the lamps disconnected as it's the only way I can get to the bottom of the board.

            With a voltage reading about 1.3v on the 5v line I switched the probe over to AMPs and switched the meter into the amp range as well.

            I was reading 0.00 so I switched to mA scale and now it would read a peak that varied (max about 125ma) but would settle to zero in a matter of seconds. Could only get a reading by removing one of the probes and retouching. Always returned to zero soon thereafter.

            What's up with that ?

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #66
              Re: Element ELCHW321 Catastrophic Failure

              OK, I would solder the wires to the S and D, connect everything back together, turn on the TV, then short the two wires together to simulate MOSFET on condition, if the switched 5V is OK, then the TV should function, then you will know that the MOSFET is bad.
              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

              • mmartell
                Badcaps Legend
                • Oct 2013
                • 3189
                • Canada

                #67
                Re: Element ELCHW321 Catastrophic Failure

                I like that idea

                Comment

                • mmartell
                  Badcaps Legend
                  • Oct 2013
                  • 3189
                  • Canada

                  #68
                  Re: Element ELCHW321 Catastrophic Failure

                  Well yoda, you nailed it. Soldered a wire from S to D and set works beautifully.

                  Since the 5v supply is switched by the 12v supply do you see any reason why I shouldn't just leave the jumper in ?

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #69
                    Re: Element ELCHW321 Catastrophic Failure

                    That switched 5V must be sequenced on after the 12V is on, otherwise they would not have designed the circuit that way. If you leave the wires connected, the switched 5V will always be present even when the TV is turned off.
                    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

                    • mmartell
                      Badcaps Legend
                      • Oct 2013
                      • 3189
                      • Canada

                      #70
                      Re: Element ELCHW321 Catastrophic Failure

                      Actually it has no problems with the on/off sequence as it is now, but if you're saying it could damage something down the road I will swap out the mosfet.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #71
                        Re: Element ELCHW321 Catastrophic Failure

                        You need to make it turns on after the 12V is on, we do not want the surprise later and I do not think it is good idea to have the switched 5V be on all the time, they have it turned off when in standby for reason.
                        Last edited by budm; 05-09-2014, 02:52 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

                        • mmartell
                          Badcaps Legend
                          • Oct 2013
                          • 3189
                          • Canada

                          #72
                          Re: Element ELCHW321 Catastrophic Failure

                          Roger roger I will swap out the mosfet in question.

                          Comment

                          • mmartell
                            Badcaps Legend
                            • Oct 2013
                            • 3189
                            • Canada

                            #73
                            Re: Element ELCHW321 Catastrophic Failure

                            Mosfet V813 has been replaced and full voltage to the 5v line has been restored. Set works as it should now.

                            Much thanks budm !!

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #74
                              Re: Element ELCHW321 Catastrophic Failure

                              Thanks for the feedback. That was fast, you have the MOSFET in stock? Started on Nov 2013, fixed in May 2014, I am glad you did not give up on it.
                              Also really to have thanks newtothis for providing the SCH, otherwise we may not have gotten this far.
                              Attached Files
                              Last edited by budm; 05-09-2014, 05:15 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

                              • mmartell
                                Badcaps Legend
                                • Oct 2013
                                • 3189
                                • Canada

                                #75
                                Re: Element ELCHW321 Catastrophic Failure

                                Well I let it sit for a long while until I bought this power supply instead of attempting to fix the train wreck that the original one was. Thanks again and here's a pic of the landfill "escapee"

                                As an aside Diane Sawyer just refuses to age !
                                Attached Files

                                Comment

                                • mmartell
                                  Badcaps Legend
                                  • Oct 2013
                                  • 3189
                                  • Canada

                                  #76
                                  Re: Element ELCHW321 Catastrophic Failure

                                  Yes of course, thanks newtothis !! To clarify I had the old power supply which I harvested the mosfet from.

                                  This was the first tv I bought to repair after I fixed my neighbours by replacing the main board so I feel sorta like I've come full circle )

                                  Comment

                                  • Repler
                                    New Member
                                    • Dec 2016
                                    • 1
                                    • Usa

                                    #77
                                    Re: Element ELCHW321 Catastrophic Failure

                                    I'm working on this exact board, looking to replace C810, C834, and C808. The schematic shows different specs than the capacitors physically on the board - does that matter?

                                    For example, C810 is on the schematic as 220uF/450V and what's physically on the board is 150uF/450V.

                                    The TV used to work just fine, and these look to me to be the original caps. Should I follow the schematic or just replace what's there?

                                    Comment

                                    • Agent24
                                      I see dead caps
                                      • Oct 2007
                                      • 4913
                                      • New Zealand

                                      #78
                                      Re: Element ELCHW321 Catastrophic Failure

                                      The original design would follow the schematic, but likely they found later they could use cheaper parts in production and get away with it.

                                      You can probably follow either\or. But copying what was already there is probably cheaper.
                                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                      -David VanHorn

                                      Comment

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