TCL TV Dead sort of ??

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  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA
    #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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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #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

        • CraigR
          Badcaps Veteran
          • Dec 2013
          • 959
          • USA
          #3
          Re: TCL TV Dead sort of ??

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

            Comment

            • CraigR
              Badcaps Veteran
              • Dec 2013
              • 959
              • USA
              #4
              Re: TCL TV Dead sort of ??

              Any other thoughts budm?

                Comment

                • ben7
                  Capaholic
                  • Jan 2011
                  • 4059
                  • USA
                  #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

                    • CraigR
                      Badcaps Veteran
                      • Dec 2013
                      • 959
                      • USA
                      #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

                        • Alastair E
                          Chief Womble
                          • Mar 2013
                          • 1963
                          • U.K.
                          #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

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA
                              #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

                                • CraigR
                                  Badcaps Veteran
                                  • Dec 2013
                                  • 959
                                  • USA
                                  #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

                                    • ben7
                                      Capaholic
                                      • Jan 2011
                                      • 4059
                                      • USA
                                      #10
                                      Re: TCL TV Dead sort of ??

                                      Originally posted by Alastair E
                                      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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