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Wharfedale LTF37K1CB Power Issue

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    #21
    Re: Wharfedale LTF37K1CB Power Issue

    Hi Budm, Can you point me in the right direction to get the right Voltage Regulator.. everywhere I've tried has not got them.

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      #22
      Re: Wharfedale LTF37K1CB Power Issue

      Originally posted by budm View Post
      3.3V regulator, right now the input voltage is too low for it to work
      Variable regulator pin 1 voltage of 0.70V + 1.25V ref then the output should be 1.95v but you are getting 3.22V, so it is bad. Variable regulator pin 1 voltage of 0.70V + 1.25V ref then the output should be 1.95v but you are getting 3.22V, so it is bad. The voltage between pin 1 and pin 2 should always be 1.25V for 1117 series variable regulator.
      )11 8CW -> line 1 of the IC
      1117L -> line 2 of the IC
      pin 1 = 0.70
      pin 2 = 3.22
      pin 3 = 5.03

      Now changed this regulator and getting

      Pin 1 = 0.71
      Pin 2 = 1.37
      Pin 3 = 0.84

      Still not turning on.

      Comment


        #23
        Re: Wharfedale LTF37K1CB Power Issue

        Pin 1 = 0.71
        Pin 2 = 1.37
        Pin 3 = 0.84

        That cannot be right, you were getting 5.03V input voltage and now you are getting 0.84V input and the output is higher than the input, so that is not right at all. 1.25 +.71 = 1.96V, you are getting 1.37V.
        Last edited by budm; 09-21-2013, 11:41 AM.
        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


          #24
          Re: Wharfedale LTF37K1CB Power Issue

          http://www.ebay.co.uk/itm/1110761250...84.m1497.l2649

          Thats what I ordered.

          Comment


            #25
            Re: Wharfedale LTF37K1CB Power Issue

            That is the right one, you need to find out why you are not getting the 5V on pin 3 (last pin on the right as shown on EBAY).
            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


              #26
              Re: Wharfedale LTF37K1CB Power Issue

              Comment


                #27
                Re: Wharfedale LTF37K1CB Power Issue

                Bah ballsed up on my original numbers.... dont know where the last one came from.

                Heres the correct details from my paper that I wrote the values down.

                )11 8CH -> line 1 of the IC
                17-33L -> line 2 of the IC
                pin 1 = 0.00
                pin 2 = 0.14
                pin 3 = 0.85


                LD18 -> line 1 of the IC
                Y437 -> line 2 of the IC
                pin 1 = 0.00
                pin 2 = 0.00
                pin 3 = 0.14


                L780SC2T -> line 1 of the IC
                GK1BN VW -> line 2 of the IC
                CHN 815 -> line 3 of the IC
                pin 1 = 0.39
                pin 2 = 0.00 Cut pin
                pin 3 = 0.00


                )11 8CH -> line 1 of the IC
                17-33L -> line 2 of the IC
                pin 1 = 0.00
                pin 2 = 0.10
                pin 3 = 0.85


                AZ10845 -> line 1 of the IC
                -3.3E1 -> line 2 of the IC
                751K99 -> line 3 of the IC
                pin 1 = 0.00
                pin 2 = 3.30
                pin 3 = 5.03


                )11 8CH -> line 1 of the IC
                17-33L -> line 2 of the IC
                pin 1 = 0.00
                pin 2 = 3.22
                pin 3 = 5.03


                )11 8CW -> line 1 of the IC
                1117L -> line 2 of the IC
                pin 1 = 0.70
                pin 2 = 1.35
                pin 3 = 0.82

                Gah dont know why I wrote that down before wrong...

                Comment


                  #28
                  Re: Wharfedale LTF37K1CB Power Issue

                  Replaced the cap next to it too, No change.

                  Comment


                    #29
                    Re: Wharfedale LTF37K1CB Power Issue

                    RIght, got a 2nd hand main AV board from ebay and fitted it today.

                    The set now turns on but before it does the blue LED at the front of the set blinks red a few times then the back light comes on. I however dont get any display from the menu or a source.

                    Any ideas?

                    Comment


                      #30
                      Re: Wharfedale LTF37K1CB Power Issue

                      Have just received the same model.Different fault,in that it took a long time to come on,LED flashing then going back to Standby.All the caps looked good,But using my ESR meter, the Capxon one( where the Green one is shown in the photo)was 47uF @35v,but with an ESR of 18Ω.Replaced and now excellent.
                      Attached Files

                      Comment


                        #31
                        Re: Wharfedale LTF37K1CB Power Issue

                        Ahh will check that out tomorrow Rtech. Hope this is it

                        Comment


                          #32
                          Re: Wharfedale LTF37K1CB Power Issue

                          Right update on this, Replaced all the caps on the power board and still the same issue. The board powers up and back lights fire up but no picture.

                          /me thinks it will be the av board that I got from Ebay is faulty

                          Comment


                            #33
                            Re: Wharfedale LTF37K1CB Power Issue

                            Got some spare time jumped back on this.

                            Checked the board that I got from eBay and here are the values for the fets. Set turns on but no display. Back lights fire up.

                            8FL-> line 1 of the IC
                            17-33L -> line 2 of the IC
                            pin 1 = 0.00
                            pin 2 = 3.27
                            pin 3 = 4.81


                            6H8L -> line 1 of the IC
                            17-18L -> line 2 of the IC
                            pin 1 = 0.00
                            pin 2 = 1.79
                            pin 3 = 3.27


                            CHN -> line 1 of the IC
                            L780SC2T-> line 2 of the IC
                            pin 1 = 10.25
                            pin 2 = 0.00 Cut pin
                            pin 3 = 5.05


                            8FL -> line 1 of the IC
                            17-33L -> line 2 of the IC
                            pin 1 = 0.00
                            pin 2 = 3.28
                            pin 3 = 4.79


                            AZ1084S -> line 1 of the IC
                            -3.3E1 -> line 2 of the IC
                            744k76 -> line 3 of the IC
                            pin 1 = 0.00
                            pin 2 = 3.28
                            pin 3 = 4.93


                            8FL -> line 1 of the IC
                            17-33L -> line 2 of the IC
                            pin 1 = 0.00
                            pin 2 = 3.28
                            pin 3 = 4.92


                            8DK -> line 1 of the IC
                            1117L -> line 2 of the IC
                            pin 1 = 1.37
                            pin 2 = 2.62
                            pin 3 = 4.81

                            Caps look fine could be a Con
                            issue now?

                            Comment


                              #34
                              Re: Wharfedale LTF37K1CB Power Issue

                              Got a tcon board yesterday. Same outcome..

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