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TCL TV Dead sort of ??

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    #1

    TCL TV Dead sort of ??

    I have a TCL TV and from what I can find out I think it's a L40FHDF11TATBAA but not positive as the sticker on the back is missing. Anyway this TV came in dead totally but I found a bad mosfet and a bad diode so I changed those and now it still looks dead except there is a LED on the power board that gives 3 long flashes and one short over and over. The set still shows nothing on the front for signs of life. I have 365v at the big cap and I only have 3.5v standby otherwise no 24v or nothing at PS_ON or BL_ON. I was wondering if I ran a 1k resistor from the 3.5 to the ps_on and bl_on if it would force backlights on?? Not sure how to go about this one since I never heard of TCL and can't find any guides. The power board is 08-LS182C0-PW200AA Much appreciated for any advice.
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    #2
    Re: TCL TV Dead sort of ??

    Are you sure you do not have PS-ON? You do have 365VDC between the two legs of the main filter cap, for you to have that boosted Voltage the main board must be sending out the PS-ON signal to turn on the PFC Voltage booster section. Please verify again.
    Unless the circuit uses Active LOW signal (LO = ON).
    Disconnect the cable between the power supply/inverter and the main board to see if you will still get 365VDC on the main filter cap.
    BTW, 365VDC is kind of low, I expect it to be closer to 400VDC.
    Last edited by budm; 12-07-2015, 05:59 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

      #3
      Re: TCL TV Dead sort of ??

      Confirmed, no voltage at PS_ON then big cap drops to nothing with the wire unplugged.

      Comment

        #4
        Re: TCL TV Dead sort of ??

        Any other thoughts budm?

        Comment

          #5
          Re: TCL TV Dead sort of ??

          I see a chip on the mainboard that has a chunk blown out of it.
          It's at the middle of the left hand side of the picture, by the HDMI ports.

          Edit: Looks like there might be an 8 pin chip that is burnt as well, on the far right side of the image (on the mainboard pic). It has a little bump on it ... might just be dust or flux, but I just wanted to point that out.
          Last edited by ben7; 12-09-2015, 12:16 PM.
          Muh-soggy-knee

          Comment

            #6
            Re: TCL TV Dead sort of ??

            Good eyes ben7 you are correct. Don't know why I did not see that, must be my old eyes.

            Comment

              #7
              Re: TCL TV Dead sort of ??

              That chip with hole--looks to be HDMI Controller....

              Typical issue when people plug/unplug HDMI's when the things are powered up! HDMI ISNT HOT Plug/Play--No matter WHAT they say!

              Prob not worth sourcing/replacing the chip--there'll be other damage I guess too. New Mainboard time...
              TELEFIX

              How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
              http://www.irf.com/technical-info/appnotes/an-1088.pdf
              PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

              Comment

                #8
                Re: TCL TV Dead sort of ??

                http://www.shopjimmy.com/catalogsear...40FHDF11TATBAA
                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

                  #9
                  Re: TCL TV Dead sort of ??

                  Yep, out of stock and only 1 on ebay out of the country and the TV is not worth the repair so another one hits the scrap heap. Thanks for the help guys!! Always appreciated!

                  Comment

                    #10
                    Re: TCL TV Dead sort of ??

                    Originally posted by Alastair E View Post
                    That chip with hole--looks to be HDMI Controller....

                    Typical issue when people plug/unplug HDMI's when the things are powered up! HDMI ISNT HOT Plug/Play--No matter WHAT they say!

                    Prob not worth sourcing/replacing the chip--there'll be other damage I guess too. New Mainboard time...
                    Sounds like poor design to me!
                    The HDMI spec actually says it is hot-pluggable...
                    So basically, if a device fails like that when hot-plugged, then it doesn't fully comply with HDMI specs...
                    Muh-soggy-knee

                    Comment

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