LCD TV 26 Stay in Standby mode Red led

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  • flosers
    Senior Member
    • Jun 2014
    • 63
    • France

    #1

    LCD TV 26 Stay in Standby mode Red led

    Hello,
    I have a problem with my LCD TV 26" "VD TECH TQT26AVD.She stay in standby.
    All capacitor seem to be good, I have checked the output of the PSU board and all voltage are good just the last "the standby connector" have 3,78v I ‘don't know if it is good or not?
    In some LCD it is the EEPROM component who need to be change but I haven't this component...
    Thanks in advance
    (Sorry for my English, I'm French)
    Attached Files
    Last edited by flosers; 07-19-2014, 12:04 PM.
  • selldoor
    Slow Learner
    • Dec 2010
    • 7870

    #2
    Re: LCD TV 26 Stay in Standby mode Red led

    Oh No ! you say its him again. Well only a small thing - TQT26AVD doesnt come up on google - that rarely happens are you sure the number is correct
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

    • flosers
      Senior Member
      • Jun 2014
      • 63
      • France

      #3
      Re: LCD TV 26 Stay in Standby mode Red led

      Sorry I don't undersand? Yes it is the right number but it is a low cost TV so maybe it's because its a rare tv?

      Comment

      • selldoor
        Slow Learner
        • Dec 2010
        • 7870

        #4
        Re: LCD TV 26 Stay in Standby mode Red led

        Ok -it is still usual to get some sort of "Hit"
        As there is nothing you will need to to post pictures of the back of the set
        showing the generl layout then pictures of the individual boards and also give the board numbers - they may come up on a search.
        Try and find a small 50v cap on the Primary HOT side of the power supply
        and CAREFULLY test the voltage on it do not touch any other componnents or heatsinks in that area.
        I have to go make dinner now so catch up later.
        Please upload pictures using attachment function when ask for help on the repair
        http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • flosers
          Senior Member
          • Jun 2014
          • 63
          • France

          #5
          Re: LCD TV 26 Stay in Standby mode Red led

          Good diner!
          I test it, I have a inexact value between 0 and 3v in AC mode.

          Comment

          • flosers
            Senior Member
            • Jun 2014
            • 63
            • France

            #6
            Re: LCD TV 26 Stay in Standby mode Red led

            Good diner!
            I test it, I have a inexact value between 0 and 3v in AC mode.

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #7
              Re: LCD TV 26 Stay in Standby mode Red led

              Ah! teo dinners and you have tested it twice
              Meter should be on DC to test voltage on a cap.
              Got me there - dont think I have heard of those boards either.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • flosers
                Senior Member
                • Jun 2014
                • 63
                • France

                #8
                Re: LCD TV 26 Stay in Standby mode Red led

                Ok sorry, now I have 256V.

                Comment

                • flosers
                  Senior Member
                  • Jun 2014
                  • 63
                  • France

                  #9
                  Re: LCD TV 26 Stay in Standby mode Red led

                  I would like to test the PSU board without the logic board with a 3v battery but the psu board don't have on/off pin... Have you any sugestion?

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #10
                    Re: LCD TV 26 Stay in Standby mode Red led

                    Originally posted by flosers
                    Ok sorry, now I have 256V.


                    No you havent - at least not on a 50v cap!!
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • flosers
                      Senior Member
                      • Jun 2014
                      • 63
                      • France

                      #11
                      Re: LCD TV 26 Stay in Standby mode Red led

                      I have check again I have! I have 320v (check 4 time)
                      Last edited by flosers; 07-19-2014, 02:22 PM.

                      Comment

                      • stj
                        Great Sage 齊天大聖
                        • Dec 2009
                        • 30964
                        • Albion

                        #12
                        Re: LCD TV 26 Stay in Standby mode Red led

                        possible,
                        if it's a startup cap then it's charged through a resistor from the rectified mains.

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870

                          #13
                          Re: LCD TV 26 Stay in Standby mode Red led

                          Originally posted by stj
                          possible,
                          if it's a startup cap then it's charged through a resistor from the rectified mains.
                          What 300V on a 5Ov cap???

                          @Floser

                          Which cap are you testing -Its not a blue one so that leaves 3 C2F C25F or C20F
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                          Comment

                          • flosers
                            Senior Member
                            • Jun 2014
                            • 63
                            • France

                            #14
                            Re: LCD TV 26 Stay in Standby mode Red led

                            It's the big one Horysontal.The C1 have 24V (at the right of the big caps),13,6V for the C2F
                            Last edited by flosers; 07-19-2014, 03:18 PM.

                            Comment

                            • selldoor
                              Slow Learner
                              • Dec 2010
                              • 7870

                              #15
                              Re: LCD TV 26 Stay in Standby mode Red led

                              Yes I thought so - that hardly fits the description small 50v cap!!

                              Its the biggest cap in the machine and is probably 400v or 450v.

                              I cant see if either of the other 2 are 50v so you must tell me.
                              Please upload pictures using attachment function when ask for help on the repair
                              http://www.badcaps.net/forum/showthread.php?t=39740

                              Comment

                              • flosers
                                Senior Member
                                • Jun 2014
                                • 63
                                • France

                                #16
                                Re: LCD TV 26 Stay in Standby mode Red led

                                C2f and c25f are 50v capacitor and the C1 is a 35v

                                Comment

                                • selldoor
                                  Slow Learner
                                  • Dec 2010
                                  • 7870

                                  #17
                                  Re: LCD TV 26 Stay in Standby mode Red led

                                  Ok one or both of the 50v caps are start up caps - if you can get to them it would be useful to know what voltage they are at on standby and what if anything changes when you press the on button. Another idea I just seen mentioned on another thread is to pre heat those two caps with a hairdrier for a minute or two before switching on.
                                  I am still thinking about jump starting. There seems to be more cables than usual and I cant see all the pin details - example what is on the two pins next to 24v? What is that
                                  cable with just 2 wires - perhaps pictures of each connector would help and also look
                                  on the back to see if any more descriptions.
                                  Do you get any voltage on the 24v pins?
                                  Probably a tomorrow job now as I guess its midnight there.
                                  Please upload pictures using attachment function when ask for help on the repair
                                  http://www.badcaps.net/forum/showthread.php?t=39740

                                  Comment

                                  • flosers
                                    Senior Member
                                    • Jun 2014
                                    • 63
                                    • France

                                    #18
                                    Re: LCD TV 26 Stay in Standby mode Red led

                                    The tv is On! But I'm afraid that if I shut off the tv she don't start after.

                                    Comment

                                    • flosers
                                      Senior Member
                                      • Jun 2014
                                      • 63
                                      • France

                                      #19
                                      Re: LCD TV 26 Stay in Standby mode Red led

                                      24v pin are good, 24v on It.The TV after some restart still on but I have tried to do the test on 50v caps but I did a short circuit .
                                      So tomorow I change the fuse and I will continue the test.
                                      Thanks for you help,I appreciate
                                      Attached Files

                                      Comment

                                      • selldoor
                                        Slow Learner
                                        • Dec 2010
                                        • 7870

                                        #20
                                        Re: LCD TV 26 Stay in Standby mode Red led

                                        Originally posted by flosers
                                        The tv is On! But I'm afraid that if I shut off the tv she don't start after.
                                        Unfortunately you cant keep it on for ever - but its always nice to see it might
                                        work eventually.

                                        Hopefully it is just a popped fuse - I did say "CAREFULLY test the voltage on it do not touch any other components or heatsinks in that area"

                                        It is looking like a loose connection/bad solder joint so pictures of the backs of the boards may help us spot something.
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

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