phillips 32pfl5522d/05 no video backlight working

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  • shaunbt123
    Senior Member
    • Nov 2012
    • 119
    • uk

    #1

    phillips 32pfl5522d/05 no video backlight working

    hi there
    can someone give me some advice regarding this set ,the problem was lines down the screen,so i changed the tcon board and now i get nothing at all,not even the menu screen.i have tried re-seating the ribbon cables from the tcon but no luck.
    when i power it up i can see the backlight is working,i have also connected this set to a second set using scart lead and the picture is fine through the second set,i have also measured the voltage at both sides of tcon fuse which is 11.97v.
    i have tested all caps on power supply board and esr is fine on all of them.
    the tcon board is a sharp tw10794v-0
    thank you.
    Last edited by shaunbt123; 06-26-2014, 08:03 AM. Reason: adding information
  • selldoor
    Slow Learner
    • Dec 2010
    • 7870

    #2
    Re: phillips 32pfl5522d/05 no video backlight working

    wrong tcon? any fuses on it? try the old one back in?
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

    • shaunbt123
      Senior Member
      • Nov 2012
      • 119
      • uk

      #3
      Re: phillips 32pfl5522d/05 no video backlight working

      all fuses on both tcon boards ok, i put the old tcon back in but all i have is backlight and no images on screen.
      thanks.

      Comment

      • MrTrollsten
        New Member
        • Jun 2014
        • 1
        • Australia

        #4
        Re: phillips 32pfl5522d/05 no video backlight working

        I had an lg tv from around 2008 with a very similar problem, the backlight would turn on and it would play sound but it would either display no picture at all or picture with green lines on the right side. It ended up being a bad solder joint on a bga chip on the sub-tcon board. What i did to find the problem was to warm up each board that had a bga chip individually with a hairdryer and watch the display. This may not be your issue, but is worth a shot.

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870

          #5
          Re: phillips 32pfl5522d/05 no video backlight working

          Is there a voltage on the tcon fuse? - Is there a fuse at the other end of the cable on the main board. Try another lvds cable - check that one for shorts/opens
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

          • shaunbt123
            Senior Member
            • Nov 2012
            • 119
            • uk

            #6
            Re: phillips 32pfl5522d/05 no video backlight working

            yes there is 11.97 volts on both sides of tcon fuse.i dont have a lvds cable so cant try that.ill have a look to see if theres a fuse on mainboard.
            thanks.


            cannot see any fuse on mainboard.
            Last edited by shaunbt123; 06-26-2014, 09:34 AM.

            Comment

            • shaunbt123
              Senior Member
              • Nov 2012
              • 119
              • uk

              #7
              Re: phillips 32pfl5522d/05 no video backlight working

              anyone else have any ideas on this one please.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: phillips 32pfl5522d/05 no video backlight working

                Try having the ribbon cable between the T-CON and the LCD panel connected one at a time to see what happen.
                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

                • shaunbt123
                  Senior Member
                  • Nov 2012
                  • 119
                  • uk

                  #9
                  Re: phillips 32pfl5522d/05 no video backlight working

                  thanks budm.
                  i have tried having one cable at a time plugged in,but the screen stays the same,, backlight on and all the screen looks the same.i have tried reseating the ribbon cables but no luck,i also know i have 11.97v at both sides of the tcon fuse.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: phillips 32pfl5522d/05 no video backlight working

                    OK, you will need the scope to see if the main board is sending the LVDS signals tot eh T-CON or not. I will lean toward bad T-CON.
                    Which one of these is your board?
                    http://www.shopjimmy.com/catalogsear.../?q=tw10794v-0
                    Last edited by budm; 06-30-2014, 11:25 AM.
                    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

                    • shaunbt123
                      Senior Member
                      • Nov 2012
                      • 119
                      • uk

                      #11
                      Re: phillips 32pfl5522d/05 no video backlight working

                      hi again budm
                      it looks like the first one at the top of the page.thank you.
                      ps i have swapped the tcon for another one but its just the same.
                      Last edited by shaunbt123; 06-30-2014, 11:43 AM.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: phillips 32pfl5522d/05 no video backlight working

                        OK, check the DC voltage of the legs (pads) of the inductors L1, L2, L4 located at the left side of the 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

                        • shaunbt123
                          Senior Member
                          • Nov 2012
                          • 119
                          • uk

                          #13
                          Re: phillips 32pfl5522d/05 no video backlight working

                          as soon as i have time i will check those voltages and get back to you with the results .thanks

                          Comment

                          • shaunbt123
                            Senior Member
                            • Nov 2012
                            • 119
                            • uk

                            #14
                            Re: phillips 32pfl5522d/05 no video backlight working

                            hi again
                            just to let you know i have tried again with the other tcon board i bought, and i now have sort of a picture except a blue band running from top to bottom in the centre of screen and the tv now goes off after about 10 seconds and comes back on by itself.this one is puzzling me now.

                            Comment

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