lcd19-229 stand by light on and off

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  • tonyuk
    Badcaps Veteran
    • Feb 2014
    • 238
    • uk

    #1

    lcd19-229 stand by light on and off

    hi got this small tv dvd tv that wont stay on when i switch on the light turns green then goes back to red see pic off layout
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: lcd19-229 stand by light on and off

    common fault on these is bad LDO regulators on main board.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • tonyuk
      Badcaps Veteran
      • Feb 2014
      • 238
      • uk

      #3
      Re: lcd19-229 stand by light on and off

      Originally posted by tom66
      common fault on these is bad LDO regulators on main board.
      whats that lol how can i test ?

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: lcd19-229 stand by light on and off

        https://www.badcaps.net/forum/showthread.php?t=22231
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • multimeter
          Badcaps Veteran
          • Jan 2011
          • 739
          • united kingdom

          #5
          Re: lcd19-229 stand by light on and off

          if its a technika one,it will be bad output caps also....
          fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

          ----------------------------------------------
          please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

          Comment

          • tonyuk
            Badcaps Veteran
            • Feb 2014
            • 238
            • uk

            #6
            Re: lcd19-229 stand by light on and off

            Originally posted by multimeter
            if its a technika one,it will be bad output caps also....
            it sure is technika caps look fine on main and psu ?

            Comment

            • multimeter
              Badcaps Veteran
              • Jan 2011
              • 739
              • united kingdom

              #7
              Re: lcd19-229 stand by light on and off

              Originally posted by tonyuk
              it sure is technika caps look fine on main and psu ?
              if i remember correctly the output caps are g-luxon?,these go bad but dont show symptoms,actually they aint bad !.

              id rule them out with capacitance and esr test just to be sure
              fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

              ----------------------------------------------
              please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

              Comment

              • tonyuk
                Badcaps Veteran
                • Feb 2014
                • 238
                • uk

                #8
                Re: lcd19-229 stand by light on and off

                pic im still reading up the link tom put but a little lost lol

                so far i know mine r 1117 Regulator
                Attached Files
                Last edited by tonyuk; 03-04-2014, 01:00 PM.

                Comment

                • tonyuk
                  Badcaps Veteran
                  • Feb 2014
                  • 238
                  • uk

                  #9
                  Re: lcd19-229 stand by light on and off

                  3 have 1117 b then under say 33 641

                  1 has 1117 b then under say ade11u

                  so im gues the top 3 r 3.3 volts ? and would test left to right
                  Last edited by tonyuk; 03-04-2014, 01:43 PM.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: lcd19-229 stand by light on and off

                    Top are 3.3V, bottom is 1.25V.

                    The voltages should be tested left to right, in the orientation in which the labelling on them reads the right way around i.e. you don't have to crane your neck
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • tonyuk
                      Badcaps Veteran
                      • Feb 2014
                      • 238
                      • uk

                      #11
                      Re: lcd19-229 stand by light on and off

                      Originally posted by tom66
                      Top are 3.3V, bottom is 1.25V.

                      The voltages should be tested left to right, in the orientation in which the labelling on them reads the right way around i.e. you don't have to crane your neck
                      ok and says you test on 20v setting yes ? even though i thought 2v would of been the way lol
                      Last edited by tonyuk; 03-04-2014, 01:56 PM.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: lcd19-229 stand by light on and off

                        20V, because that's the maximum range your meter can support. If you tried to read 3.3V on a 2V range, your meter would just show over-range ("OL" or single "1")
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

                        • tonyuk
                          Badcaps Veteran
                          • Feb 2014
                          • 238
                          • uk

                          #13
                          Re: lcd19-229 stand by light on and off

                          Originally posted by tom66
                          20V, because that's the maximum range your meter can support. If you tried to read 3.3V on a 2V range, your meter would just show over-range ("OL" or single "1")
                          ok thanks tom will check them and post

                          fitting kitchens or building engines is so much easier

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: lcd19-229 stand by light on and off

                            Haha, maybe for you, honestly I'd probably fit the kitchen upside down and have half the parts from the engine missing.
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • tonyuk
                              Badcaps Veteran
                              • Feb 2014
                              • 238
                              • uk

                              #15
                              Re: lcd19-229 stand by light on and off

                              ok so below is list

                              1st

                              =000
                              =3.31
                              =5.07

                              2dr

                              =000
                              =3.32
                              =4.98

                              3dr

                              =000
                              =3.31
                              =4.97

                              this is the 1.25v

                              =0.61
                              =1.86
                              =3.38

                              this is me testing with light stuck on red stand by black lead to screw red to each pin left to right lol
                              Last edited by tonyuk; 03-04-2014, 02:30 PM.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: lcd19-229 stand by light on and off

                                Can you try making the measurements as you turn the set on for the last three? You may have to turn it on and off a lot of times. A close picture of the power supply showing the label would help too.
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

                                • tonyuk
                                  Badcaps Veteran
                                  • Feb 2014
                                  • 238
                                  • uk

                                  #17
                                  Re: lcd19-229 stand by light on and off

                                  Originally posted by tom66
                                  Can you try making the measurements as you turn the set on for the last three? You may have to turn it on and off a lot of times. A close picture of the power supply showing the label would help too.
                                  ok re-done list above with green light on

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: lcd19-229 stand by light on and off

                                    Hmm, my error on the 1.25V. That is OK, it is just normal adjustable type. doh.
                                    Readings seem good, so there's little more to suggest.
                                    Can you see part U7 near one of those LDOs? What is the part # on it?
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • tonyuk
                                      Badcaps Veteran
                                      • Feb 2014
                                      • 238
                                      • uk

                                      #19
                                      Re: lcd19-229 stand by light on and off

                                      Originally posted by tom66
                                      Hmm, my error on the 1.25V. That is OK, it is just normal adjustable type. doh.
                                      Readings seem good, so there's little more to suggest.
                                      Can you see part U7 near one of those LDOs? What is the part # on it?
                                      yerp u7
                                      Attached Files

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: lcd19-229 stand by light on and off

                                        Part # printed on device U7 please?
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

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