LCD TV won't turn on. LED keeps blinking

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  • sahan14
    Senior Member
    • Oct 2016
    • 52
    • sri lanka

    #41
    Re: LCD TV won't turn on. LED keeps blinking

    do i test the 450v cap again?

    Comment

    • vinceroger69
      Badcaps Legend
      • Mar 2012
      • 6714
      • uk

      #42
      Re: LCD TV won't turn on. LED keeps blinking

      yes put the psu back in the tv connect it all up as how it should be and carfully test voltage across that capacitor again

      Comment

      • sahan14
        Senior Member
        • Oct 2016
        • 52
        • sri lanka

        #43
        Re: LCD TV won't turn on. LED keeps blinking

        320v in 450v cap
        is it bad?

        Comment

        • sahan14
          Senior Member
          • Oct 2016
          • 52
          • sri lanka

          #44
          Re: LCD TV won't turn on. LED keeps blinking

          GND of primary and secondary circuits are not connected. Is it a fault ?

          Comment

          • vinceroger69
            Badcaps Legend
            • Mar 2012
            • 6714
            • uk

            #45
            Re: LCD TV won't turn on. LED keeps blinking

            i would of thought it should be slighty higher when the pfc circuit boosts the voltage up although the 450v on the capacitor is the maximum it can take it does not mean it should be 450v ive been trying to find a service manual for the tv but no luck as yet hopefully budm will have a read of this thread and have a idea what too check next as im still learning myself too ive attached a data sheet for one of the ics in your previous posts but cant find a data sheet for the other on, so bear with us im sure a more experienced members will advise on some more tests you can run soon.

            Comment

            • culcuhain
              Senior Member
              • May 2016
              • 186
              • U$@

              #46
              Re: LCD TV won't turn on. LED keeps blinking

              make sure you are using the legs of the capacitor to check the voltages for the large caps.

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #47
                Re: LCD TV won't turn on. LED keeps blinking

                Originally posted by vinceroger69
                so you have fitted the new correct fuse to the psu then used the dim bulb tester and buld flashed and went off? if thats the case we can start testing voltages again we need to see why the boosted voltage is not there i have found a data sheet for the larger ic but cant seem to find one for the 230d6 ic
                I believe that these are the data sheets needed.
                Attached Files
                Willing to help but I'm no expert.

                Comment

                • dick_barton
                  Badcaps Legend
                  • Aug 2015
                  • 6642
                  • Wales

                  #48
                  Re: LCD TV won't turn on. LED keeps blinking

                  Are you able to confirm the DC voltage across the large capacitor when switched on out of standby.
                  Willing to help but I'm no expert.

                  Comment

                  • vinceroger69
                    Badcaps Legend
                    • Mar 2012
                    • 6714
                    • uk

                    #49
                    Re: LCD TV won't turn on. LED keeps blinking

                    im sure he tested that a few posts back now hes repaired the blown fuse it was 320v ive never worked on the pfc circuit so im still learning too from you guys as what too test next etc

                    Comment

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6642
                      • Wales

                      #50
                      Re: LCD TV won't turn on. LED keeps blinking

                      Test the voltage on the VCC pin of the L6559 very carefully.
                      The DC voltage between Pin12 (VCC) and ground (negative leg of large capacitor) should be 10 -11.5V at turn on with a maximum voltage of 16V
                      Attached Files
                      Last edited by dick_barton; 10-13-2016, 11:31 AM.
                      Willing to help but I'm no expert.

                      Comment

                      • sahan14
                        Senior Member
                        • Oct 2016
                        • 52
                        • sri lanka

                        #51
                        Re: LCD TV won't turn on. LED keeps blinking

                        I checked the ic
                        Last edited by sahan14; 10-14-2016, 01:51 AM.

                        Comment

                        • sahan14
                          Senior Member
                          • Oct 2016
                          • 52
                          • sri lanka

                          #52
                          Re: LCD TV won't turn on. LED keeps blinking

                          yes i checked the legs of the cap.

                          Comment

                          • sahan14
                            Senior Member
                            • Oct 2016
                            • 52
                            • sri lanka

                            #53
                            Re: LCD TV won't turn on. LED keeps blinking

                            thank you barton for the files

                            Comment

                            • sahan14
                              Senior Member
                              • Oct 2016
                              • 52
                              • sri lanka

                              #54
                              Re: LCD TV won't turn on. LED keeps blinking

                              i checked the output pins and there is no voltage. (white pins)
                              Attached Files
                              Last edited by sahan14; 10-14-2016, 01:47 AM.

                              Comment

                              • sahan14
                                Senior Member
                                • Oct 2016
                                • 52
                                • sri lanka

                                #55
                                Re: LCD TV won't turn on. LED keeps blinking

                                Originally posted by dick_barton
                                Are you able to confirm the DC voltage across the large capacitor when switched on out of standby.
                                yes i switched on and tested the voltage. its around 325v

                                Comment

                                • sahan14
                                  Senior Member
                                  • Oct 2016
                                  • 52
                                  • sri lanka

                                  #56
                                  Re: LCD TV won't turn on. LED keeps blinking

                                  Originally posted by dick_barton
                                  Test the voltage on the VCC pin of the L6559 very carefully.
                                  The DC voltage between Pin12 (VCC) and ground (negative leg of large capacitor) should be 10 -11.5V at turn on with a maximum voltage of 16V
                                  i checked the ic
                                  VCC and the GND are connected (both are GND) :o
                                  there are some issues i checked the board
                                  a diode and transistor connected to GND line. (both sides)
                                  i cant find, where is the short or the bad component.

                                  Comment

                                  • sahan14
                                    Senior Member
                                    • Oct 2016
                                    • 52
                                    • sri lanka

                                    #57
                                    Re: LCD TV won't turn on. LED keeps blinking

                                    both pins are GND
                                    Attached Files
                                    Last edited by sahan14; 10-14-2016, 03:03 AM.

                                    Comment

                                    • vinceroger69
                                      Badcaps Legend
                                      • Mar 2012
                                      • 6714
                                      • uk

                                      #58
                                      Re: LCD TV won't turn on. LED keeps blinking

                                      im not sure what your checking you need to test the ic by putting negitive multi meter lead onto negitive side of the large capacitor and then the red multimeter lead onto pin 12 of the ic and take the voltage reading be carfull not too let the probe slip as can short out small pins easily ive marked the ic you should be checking with a yellow outline
                                      Attached Files
                                      Last edited by vinceroger69; 10-14-2016, 03:13 AM.

                                      Comment

                                      • sahan14
                                        Senior Member
                                        • Oct 2016
                                        • 52
                                        • sri lanka

                                        #59
                                        Re: LCD TV won't turn on. LED keeps blinking

                                        is it okay, VCC and the GND in the IC..... are both connected to common ground line?

                                        Comment

                                        • vinceroger69
                                          Badcaps Legend
                                          • Mar 2012
                                          • 6714
                                          • uk

                                          #60
                                          Re: LCD TV won't turn on. LED keeps blinking

                                          see above edit ive made is that the ic your testing?

                                          Comment

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