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TCL Model 55S405 - No Pic, No Backlight, No Sound - HELP!!!

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    TCL Model 55S405 - No Pic, No Backlight, No Sound - HELP!!!

    Hi guys.. I got a tcl tv model 55S425 with no picture, no backlight and no sound. Do you think its an led or main board issue? What do you suggest I buy to fix it?

    #2
    Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

    So no indicator light on the front of the tv at all?

    Comment


      #3
      Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

      Originally posted by nomoresonys View Post
      So no indicator light on the front of the tv at all?
      The screen is dark but you can still make out the menu if you look hard enough. It's a backlight issue to my knowledge.

      Comment


        #4
        Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

        Please attach good clear pictures of the whole backside of the TV using 'Go Advanced' so we can see all the boards.
        What Voltage testing have you done so far?
        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


          #5
          Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

          Originally posted by budm View Post
          Please attach good clear pictures of the whole backside of the TV using 'Go Advanced' so we can see all the boards.
          What Voltage testing have you done so far?
          Hi budman. I havent done any voltage testing since I'm not versed in that field of electronics. What do you suggest?

          Comment


            #6
            Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

            1) Well, right now we have no idea what we are dealing with since we do not have the TV in front of us to look at.
            2) You need to have digital mutli meter and know how to use it to perform some Voltage testing, if you do not have any tools then all you can do is visual inspection or just start buying boards to see if it will fix the problem or not but if you have bad backlights problem then buying boards will be useless, that is why Voltage testing is needed to help narrowing down the problems.
            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


              #7
              Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

              Originally posted by budm View Post
              1) Well, right now we have no idea what we are dealing with since we do not have the TV in front of us to look at.
              2) You need to have digital mutli meter and know how to use it to perform some Voltage testing, if you do not have any tools then all you can do is visual inspection or just start buying boards to see if it will fix the problem or not but if you have bad backlights problem then buying boards will be useless, that is why Voltage testing is needed to help narrowing down the problems.
              Hi budm. I have a friend who might have a multimeter. If I do get it, will you help me test which components to zero in on on my tv?

              Comment


                #8
                Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                Make sure to read the meter manual first, and the TV needs to be plugged into GFCI outlet for safety then we can go from there.
                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 Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                  Originally posted by budm View Post
                  Make sure to read the meter manual first, and the TV needs to be plugged into GFCI outlet for safety then we can go from there.
                  Hi bud.. I did reset the tv through my roku remote while the it was dark. After that I'm able to see "TCL Roku TV" flash once for a split sec but thats it. I can repeat this many times but the tv still wont turn on. Given this do you still think its an led strip issue or something else?

                  Btw I'm trying to get that multimeter.

                  Also if its an led strip issue and I buy led strips, do I have to solder them onto the tv?
                  Last edited by koolx; 07-01-2020, 04:02 PM.

                  Comment


                    #10
                    Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                    Can pick up a basic multimeter for about 10 bucks at the big box stores.

                    Comment


                      #11
                      Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                      Originally posted by koolx View Post
                      Hi bud.. I did reset the tv through my roku remote while the it was dark. After that I'm able to see "TCL Roku TV" flash once for a split sec but thats it. I can repeat this many times but the tv still wont turn on. Given this do you still think its an led strip issue or something else?

                      Btw I'm trying to get that multimeter.

                      Also if its an led strip issue and I buy led strips, do I have to solder them onto the tv?
                      1) We cannot tell anything until we do some measurement first.
                      2) If it is bad LED strips, then you will need to dissemble the LCD panel to get to the LED strips. Are good at mechanical assembly/disassembly? This is large panel so a very good chance of breaking it if you have no experience.
                      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


                        #12
                        Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                        Originally posted by budm View Post
                        Make sure to read the meter manual first, and the TV needs to be plugged into GFCI outlet for safety then we can go from there.
                        Hy bud.. ok so my super gave me his sperry mulitmeter. He also gave me a "pen" to check for other measurements. I assume the pen will be used to check the led strips. Let me know if both these devices will suffice and how to start fixing my tv.. thanks bud.
                        Attached Files
                        Last edited by koolx; 07-03-2020, 03:12 PM.

                        Comment


                          #13
                          Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                          That pen is for probing for active AC for electrician, not going to be use for trouble shooting the TV.
                          I hope you get the user manual for that meter, it looks like it is made for Electrician.
                          Please read the manual.
                          https://www.sperryinstruments.com/en...s-DM2A-Digital
                          Attached Files
                          Last edited by budm; 07-03-2020, 03:22 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


                            #14
                            Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                            Originally posted by budm View Post
                            Please attach good clear pictures of the whole backside of the TV using 'Go Advanced' so we can see all the boards.
                            What Voltage testing have you done so far?
                            So where are the pictures?
                            You do have GFCI outlet to plug the TV into, correct?
                            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


                              #15
                              Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                              Originally posted by budm View Post
                              Make sure to read the meter manual first, and the TV needs to be plugged into GFCI outlet for safety then we can go from there.
                              Originally posted by budm View Post
                              So where are the pictures?
                              You do have GFCI outlet to plug the TV into, correct?
                              Hey bud.. I read the manual that youve attached. Although I'm no techie I get the gist of it.

                              As for a GFCI outlet, I can possibly get one from my super. I'll ask though I doubt he has one.

                              Below are the pics as you've requested...

                              ***CORRECTION*** My tv is TCL model 55S405. Sorry for the typo in my original post.. I'll change it!

                              .
                              Attached Files
                              Last edited by koolx; 07-03-2020, 05:38 PM.

                              Comment


                                #16
                                Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                                1) You should try setting meter to read DC V and measuring some battery Voltage such as AA, car battery to see what it shows on the meter just to get to know your meter because correct DATA of your measurement is very important for us.
                                2) Your bath room outlet should be protected by the GFCI so you can use the outlet with extension cord. https://www.dfliq.net/blog/what-is-gfci-outlet/
                                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


                                  #17
                                  Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                                  Originally posted by budm View Post
                                  1) You should try setting meter to read DC V and measuring some battery Voltage such as AA, car battery to see what it shows on the meter just to get to know your meter because correct DATA of your measurement is very important for us.
                                  2) Your bath room outlet should be protected by the GFCI so you can use the outlet with extension cord. https://www.dfliq.net/blog/what-is-gfci-outlet/
                                  Sure I'll have the super help me with that. But fyi I'm not sure you read the last part of my last reply. I edited it after posting it. Just wanted you to know that I made a typo in the title of my thread. The correct model of my unit is 55S405, NOT 55S425. I sent a note of this to the mod and hopefully he should correct it.

                                  I'll let you know when I'm ready for your instruction. Thanks bud!

                                  .

                                  Comment


                                    #18
                                    Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                                    Please verify the TV full model number.
                                    According to shopjimmy, the boards for the 55S425 do not show the power supply used in your TV, your power supply board is P/N 08-L14TWA2-PW220AL
                                    There are many versions of the same TV model.
                                    https://www.shopjimmy.com/tcl-08-l14...wer-supply.htm
                                    According to SJ, your power supply board is used in 49S405TDAA and 55S405LGAA.
                                    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


                                      #19
                                      Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                                      Originally posted by koolx View Post
                                      Sure I'll have the super help me with that. But fyi I'm not sure you read the last part of my last reply. I edited it after posting it. Just wanted you to know that I made a typo in the title of my thread. The correct model of my unit is 55S405, NOT 55S425. I sent a note of this to the mod and hopefully he should correct it.

                                      I'll let you know when I'm ready for your instruction. Thanks bud!

                                      .
                                      OK, these are the boards used in your TV model 55S405.
                                      https://www.shopjimmy.com/catalogsea.../?q=55S405LGAA
                                      Last edited by budm; 07-03-2020, 06:11 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


                                        #20
                                        Re: TCL Model 55S425 - No Pic, No Backlight, No Sound - HELP!!!

                                        OK, as you can see, Red connector P2 of the power supply board has pin names located on the bottom side of the board. The exposed pin on the top side of the board are ODD number pins that you can carefully check the Voltage of each pin easily, the EVEN number pins, you will need to use skinny probe to probe the pins from the wire entrance side side of the connect, all the Voltage testing has to be done with all connectors in place.

                                        Turn the TV on and then check the Voltage on each pin, Black probe of the meter connected to the metal chassis of the TV for meter ground reference:
                                        Report the reading as shown in the format below. Make sure to count the pin correctly.
                                        PIN 1: PDIM (PWM Dimming control) = xxx V
                                        PIN 2: BL-ON = xxx V
                                        PIN 3: GND = xxx V
                                        PIN 4: P-ON (PS-ON:mpower supply turn on control signal) = xxx V
                                        PIN 5: N.C. (NO CONNECTION)
                                        PIN 6: A_DIM (Analog Diming control) = xxx V
                                        PIN 7: GND = xxx V
                                        PIN 8: GND = xxx V
                                        PIN 9: 12VDC = xxx V
                                        PIN 10: 12VDC = xxx V
                                        PIN 11: 12VDC = xxx V
                                        PIN 12: 12VDC = xxx V
                                        PIN 13: 12VDC = xxx V
                                        PIN 14: 3D_EN (3D MODE Enable) = xxx V

                                        Pictures provided by shopjimmy.
                                        Attached Files
                                        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

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