Element Elchw321 will not turn on

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  • Herbssat
    Senior Member
    • Sep 2011
    • 194

    #1

    Element Elchw321 will not turn on

    Have been working on this set off and on for about 2 months. After it came in stuck on standby I decided to immediately jump the power supply bypassing the mainboard. All voltages checked are spot on. However I noticed that the backlights would not turn on and if you were lucky you might get a sputter from one or more of the bulbs. Just to be sure I ordered more inverters from China as the originals were out of the 3 percent tolerance. Got the inverters and put them in finding 2 bad bulbs in the lower quadrant of the screen. I found this by using Bud's Cfl method. Have progressed to this point but cannot get the backlights to stay on even with all new cfl bulbs soldered to the inverters. Even tried to simulate the dim control with an AA battery to no avail. I will worry about the mainboard signals after I can get the backlights to stay on. Will definitely need some help on this. Thanks.
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: Element Elchw321 will not turn on

    Have you images of the boards used please ?
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment

    • Herbssat
      Senior Member
      • Sep 2011
      • 194

      #3
      Re: Element Elchw321 will not turn on

      Sorry Reecey. Somehow my initial thread got double posted. There is another thread that contains a picture of one board. I will try to get more pictures up asap. Thanks for the response.

      Comment

      • Herbssat
        Senior Member
        • Sep 2011
        • 194

        #4
        Re: Element Elchw321 will not turn on

        Here are some pics. SW voltage is still at 3.0 when backlights shut off and the backlight inverter ic is the Fan 7313. All inverters have been checked for tolerance.
        Attached Files

        Comment

        • Herbssat
          Senior Member
          • Sep 2011
          • 194

          #5
          Re: Element Elchw321 will not turn on

          Still need some suggestions . Anybody? Thanks.

          Comment

          • Herbssat
            Senior Member
            • Sep 2011
            • 194

            #6
            Re: Element Elchw321 will not turn on

            Still need some help on this set. Whatever you guys can suggest is greatly appreciated. The board model is RSAG7.820.1459. Thanks.

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8061
              • Canada

              #7
              Re: Element Elchw321 will not turn on

              maybe the inverter shuts down because of too much current being drawn (bad CCFLs), or it thinks there is too much current being drawn from the inverter?
              Maybe bypass the protection circuit on the inverter?

              Comment

              • Herbssat
                Senior Member
                • Sep 2011
                • 194

                #8
                Re: Element Elchw321 will not turn on

                Thanks for the response Capleaker. Will try to see if I can bypass the protection momentarily to see if I can keep the backlights on. Going to lookup the datasheet of the backlight ic.

                Comment

                • zape
                  Senior Member
                  • Jul 2017
                  • 176
                  • USA

                  #9
                  Re: Element Elchw321 will not turn on

                  Did you figure it out?
                  I'm working on the same board which also has no backlight.
                  Identified and replaced one dead FETs (V803 on schematic) driving the Backlight transformer but still nothing. The replacement has two times less RDS on though, not sure if it may be a problem
                  Never worked with CFL inverter before. Any help or links to troubleshooting methods appreciated.
                  The schematic is attached.
                  Attached Files
                  Last edited by zape; 03-03-2019, 10:28 AM.

                  Comment

                  • CapLeaker
                    Leaking Member
                    • Dec 2014
                    • 8061
                    • Canada

                    #10
                    Re: Element Elchw321 will not turn on

                    Are you saying you have ZERO back lights, or do they come on for 2 seconds and disappear?

                    Comment

                    • zape
                      Senior Member
                      • Jul 2017
                      • 176
                      • USA

                      #11
                      Re: Element Elchw321 will not turn on

                      Zero backlight. Everything else works - I can see the menu with a flashlight test.
                      Last edited by zape; 03-03-2019, 11:20 AM.

                      Comment

                      • R_J
                        Badcaps Legend
                        • Jun 2012
                        • 9535
                        • Canada

                        #12
                        Re: Element Elchw321 will not turn on

                        Identified and replaced one dead FETs (V803 on schematic)
                        What was wrong with the fet? if all leads were shorted, there is likely damage to the gate drive components.

                        Comment

                        • zape
                          Senior Member
                          • Jul 2017
                          • 176
                          • USA

                          #13
                          Re: Element Elchw321 will not turn on

                          Not all, but D-S Vdrop shows 0.15v both ways
                          I did not find any damaged components on the gate side

                          Comment

                          • CapLeaker
                            Leaking Member
                            • Dec 2014
                            • 8061
                            • Canada

                            #14
                            Re: Element Elchw321 will not turn on

                            Check the BLon signal from the main board to the PSU, maybe it is missing. If it is missing it MAY be an EEPROM problem.

                            Try forcing the PSU and the back lights on, with the main board unhooked. You need two 1k ohm resistors. Take one resistor and jump STBY to PSon. Take the other resistor and jump STBY to BLon. Plug the set in and the PSU should be on and the back lights on.

                            https://www.shopjimmy.com/element-e0...rom-only-1.htm
                            Last edited by CapLeaker; 03-03-2019, 11:54 AM.

                            Comment

                            • R_J
                              Badcaps Legend
                              • Jun 2012
                              • 9535
                              • Canada

                              #15
                              Re: Element Elchw321 will not turn on

                              Was it showing D-S short in circuit or out of circuit? The reason I ask is that is unlikely the fet was shorted and the main fuse did not blow also, If you charged the gate with your meter during testing it would have turned the fet ON, so it would have tested short between D-S.
                              Last edited by R_J; 03-03-2019, 12:25 PM.

                              Comment

                              • zape
                                Senior Member
                                • Jul 2017
                                • 176
                                • USA

                                #16
                                Re: Element Elchw321 will not turn on

                                Both in circuit and out. I'm aware of the FET charging.
                                Some strange things happened now. I was about to check the SW ON signal and it turned on and backlight works now.
                                No idea why it did not work the first time.
                                Could be some sort of intermittent problem still present.

                                Comment

                                • R_J
                                  Badcaps Legend
                                  • Jun 2012
                                  • 9535
                                  • Canada

                                  #17
                                  Re: Element Elchw321 will not turn on

                                  Check for poor solder connections on any components on heatsinks and also transformer connections

                                  Comment

                                  • zape
                                    Senior Member
                                    • Jul 2017
                                    • 176
                                    • USA

                                    #18
                                    Re: Element Elchw321 will not turn on

                                    Could this be the fact that I put in a different FET? So it is disbalanced now?
                                    Original was FDPF7N50U and I used 2SK3569 which I randomly scavenged off some other board.

                                    Comment

                                    • R_J
                                      Badcaps Legend
                                      • Jun 2012
                                      • 9535
                                      • Canada

                                      #19
                                      Re: Element Elchw321 will not turn on

                                      That could be.

                                      Comment

                                      • zape
                                        Senior Member
                                        • Jul 2017
                                        • 176
                                        • USA

                                        #20
                                        Re: Element Elchw321 will not turn on

                                        Can't turn it on again. It was just once when the backlight turned on.

                                        Comment

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