Soniq E40W13A-AU Backlight Problem. Help a noob out

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  • Kooda
    Member
    • Sep 2014
    • 15
    • Australia
    #1

    Soniq E40W13A-AU Backlight Problem. Help a noob out

    Hey guys! So yesterday my telly decided to pack it in. No signs of anything going wrong before hand. On startup it will play the startup sound and show the startup screen for a split second then fades to black. The image is then visible using the flashlight technique, so, definitely backlight I'm assuming? All caps etc. look to be in good enough condition and no discolouration anywhere. I've included a couple pics of the board arrangement etc. nt sure how much help they will be though. Please help, I'm gunna lose my mind without having a telly to come home to! TIA.
    Attached Files
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    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

      Suggest you read this, going to be fun to fix if your a beginner lol. My bet is Led backlight failure again:

      https://www.badcaps.net/forum/showth...light=Stacking
      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

        • Kooda
          Member
          • Sep 2014
          • 15
          • Australia
          #3
          Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

          Haha sounds fun. Am I wrong in thinking that because the backlight still functions, albeit for less than a second, that it isn't a failure of the LED's themselves? Is there a way I could mabye run a jumper wire and see if the LED circuit is still intact and potentially functional?

            Comment

            • Kooda
              Member
              • Sep 2014
              • 15
              • Australia
              #4
              Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

              Okay, so I measured 12v at the led pins when turned on, until the backlight flashes for that one second and it drops down to 0. Unplugged the led's and got the same result. Measured voltages a cable running from psu to main board. All seem to be okay barre one odd one out which was 4v (everything else was 5v or 12v)

                Comment

                • dick_barton
                  Badcaps Legend
                  • Aug 2015
                  • 6642
                  • Wales
                  #5
                  Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                  Your pictures are very fuzzy and hard to identify parts. 12V sounds far to low for an led supply which is often >100V mark. Is the LED voltage written on the power supply board?
                  Willing to help but I'm no expert.

                    Comment

                    • ReeceyBurger123
                      Never Give Up !
                      • May 2014
                      • 7325
                      • Britain
                      #6
                      Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                      Think theres a repair kit for the Psu for this for the Led drive area. Disconnect the Leds and retest the voltage.
                      Last edited by ReeceyBurger123; 05-15-2016, 11:20 AM.
                      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

                        • Kooda
                          Member
                          • Sep 2014
                          • 15
                          • Australia
                          #7
                          Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                          I'll definitely take some hq shots tomorrow as to give you a better idea of the components. I did measure the voltage with the led's disconnected and it remained at 12v, well at least what I think is the led power wiring ( 2 pairs of wires running through the chassis, didn't light up on startup when unplugged).

                          Also no, it doesn't appear to have marked voltages for the leds on the board, unless they're on the underside?
                          Last edited by Kooda; 05-15-2016, 11:35 AM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA
                              #8
                              Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                              BTW, please make sure it is straight shot pictures of the top and bottom side of the board and may good close up around the LED power supply/connector section too.
                              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

                                • Kooda
                                  Member
                                  • Sep 2014
                                  • 15
                                  • Australia
                                  #9
                                  Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                  Yep will do budm. Would have the capacitors discharged by now (10-12 hours or so)? If not is shorting the caps with a screwdriver generally frowned upon? Don't have any resistors etc on hand

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA
                                      #10
                                      Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                      Just measure the DCV right between the two legs of the cap, that is a sure way to find out if you still have lethal Voltage on the cap or not.
                                      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

                                        • Kooda
                                          Member
                                          • Sep 2014
                                          • 15
                                          • Australia
                                          #11
                                          Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                          So I'm fine to measure such high voltages with a standard DMM?

                                            Comment

                                            • martino
                                              Not so "senior"
                                              • Aug 2013
                                              • 997
                                              • canada
                                              #12
                                              Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                              If your dmm has a 1000vdc setting,yes.
                                              Proud owner of dozens of broken TV's and many,many,many boards.


                                              Our website and passion:http://hollenhundshepherds.com/

                                                Comment

                                                • Kooda
                                                  Member
                                                  • Sep 2014
                                                  • 15
                                                  • Australia
                                                  #13
                                                  Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                                  Okay, got some high res pics of the boards if anyone wants to see if anything stands out. Also, I'm assuming the led driver is built in to the power board, and the t-con board is the long board down the bottom? Would a faulty t-con cause backlight problems?
                                                  Attached Files

                                                    Comment

                                                    • Kooda
                                                      Member
                                                      • Sep 2014
                                                      • 15
                                                      • Australia
                                                      #14
                                                      Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                                      Okay so a tiny bit more progress so far. I've taken then panel apart to inspect the led's. Seems I was mistaken and only the bottom half of the backlight (two lengths/four individual strips) are lighting up momentarily on startup. Also, not sure if this means anything but, if i short the led terminals of each strip, it will light up different strips and different configurations. They are all able to be lit up besides one segment. Is it safe to say this is the culprit? Got a lil video if my explanation is a bit hard to understand. TIA

                                                        Comment

                                                        • ReeceyBurger123
                                                          Never Give Up !
                                                          • May 2014
                                                          • 7325
                                                          • Britain
                                                          #15
                                                          Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                                          Thats the issue then, have you watched my video ? If not it shows how to test them.
                                                          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

                                                            • Kooda
                                                              Member
                                                              • Sep 2014
                                                              • 15
                                                              • Australia
                                                              #16
                                                              Re: Soniq E40W13A-AU Backlight Problem. Help a noob out

                                                              It is done! So god damn happy. After following your tut,I managed to track down the faulty led and fix it, although I simply had to bridge it with solder as I have no spare led's and such, but there is no loss of brightness at all and it's operating perfectly! Happy days

                                                                Comment

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