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42lg3000-za No Picture but got sound

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    #81
    Re: 42lg3000-za No Picture but got sound

    master
    test1=0.00
    test2=0.00
    test3=0.00
    test4=0.00
    slave
    test5=0.00
    test6=0.00
    test7=0.00
    test8=0.00

    And the same results with probes in reverse order.
    Have not got to take the cover of t-con as yet, seems a bit tricky. will do tho
    Attached Files
    Last edited by Jahson; 06-03-2012, 01:18 PM.

    Comment


      #82
      Re: 42lg3000-za No Picture but got sound

      can you post a pic of the t con and cover we may have some ideas on how they come off.
      was the readings taken with the meter set on 20kohms?

      Comment


        #83
        Re: 42lg3000-za No Picture but got sound

        ok got the cover of, cable a bit more harder
        Attached Files

        Comment


          #84
          Re: 42lg3000-za No Picture but got sound

          yea meter was on 20k ohm

          Comment


            #85
            Re: 42lg3000-za No Picture but got sound

            Can you see the fuse on the tcon - small white 3A

            Think you have tested transformers incorrectly
            Put on 2000ohms (Not 20k) and put one probe on pin12 then the other probe onto each of the other 3 pins on that end in turn
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment


              #86
              Re: 42lg3000-za No Picture but got sound

              meter set to 2k
              Master
              Transformer T1
              test 1 = .000
              test 2 = .000
              test3 = .000

              Transformer T2
              test 1 = .000
              test 2 =-1 on left side
              test 3 = 1 on left side

              Slave
              transformer T200
              test 1 = .000
              test 2 = .000
              test 3 = .000

              tranformer T201
              test 1 = .000
              test 2 =-1 on left side
              test 3 = 1 on left side
              Attached Files
              Last edited by Jahson; 06-03-2012, 02:15 PM.

              Comment


                #87
                Re: 42lg3000-za No Picture but got sound

                Yea fuse on T-con checks as ok

                Comment


                  #88
                  Re: 42lg3000-za No Picture but got sound

                  i have not tested this type of invertor tranformer myself before i was just going by toms post 65? so not sure but at least you have posted the readings so someone should be able to comfirm for us.

                  Comment


                    #89
                    Re: 42lg3000-za No Picture but got sound

                    Im really thankful for you guys help, i know its still early, in the diagnostic stages.

                    Comment


                      #90
                      Re: 42lg3000-za No Picture but got sound

                      Originally posted by Jahson View Post
                      Yea fuse on T-con checks as ok
                      I was hoping it wasnt.

                      Still dont think we have the correct test for the Transformers. They usually measure 400 -1500 ohms Some of them have one end of the secondary at one end and the other at the opposite end of the transformer. I have looked on line but cant find much on these transformers - but it is good I can read the part numbers in your pics.
                      The likelyhood of all secondaries being sorted or open is like winning the lottery.

                      Is there a problem with pics of the backs of the inverter boards
                      Attached Files
                      Last edited by selldoor; 06-03-2012, 02:55 PM. Reason: Each end like this one
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment


                        #91
                        Re: 42lg3000-za No Picture but got sound

                        Theres nothing on the backs of inverters , sorry im not at the same place as the TV now.

                        Comment


                          #92
                          Re: 42lg3000-za No Picture but got sound

                          Aint given up yet, im not at the same place as the tv, be greatful if someone can get me a close up of (vit71053.54 master) just yesday i had a real close look on mines aint sure but theres an area on my board that just dont seems right. Like someone tried soldering or them lil black rectangle bits missing.

                          I just want compare, my board with a good close up image.

                          Comment


                            #93
                            Re: 42lg3000-za No Picture but got sound

                            Which area are you talking about - give the board part designations - like Qxxx.
                            Not all positions are populated - they are just put on the board at design stage in case of need. Its easy to not use a position but difficult to add one later.
                            We are unlikely to find a picture if you cant - now you see why we ask for good clear pictures?
                            Last edited by selldoor; 06-09-2012, 08:35 AM.
                            Please upload pictures using attachment function when ask for help on the repair
                            http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment


                              #94
                              Re: 42lg3000-za No Picture but got sound

                              selldoor you see the pix in post#86

                              If you look in the center of board, it looks like bits of solder all over the gaff.
                              I know whot you saying but this looks kinda unprofessional.
                              Attached Files
                              Last edited by Jahson; 06-09-2012, 10:10 AM.

                              Comment


                                #95
                                Re: 42lg3000-za No Picture but got sound

                                Post #6
                                "pin 1 is a blue wire should be 24v
                                pin 2 is grey 24v
                                pin 3 is grey 24v
                                pin 4 is grey 24v
                                pin 5 is grey 24v

                                Then the next 6 to 10 are GND
                                pin 11 =BR1
                                pin 12 =on/off
                                pin 13 =pwd dim
                                pin 14 =error"

                                So do you get 2.9VDC (as indicated in post11) at the pin 12,
                                Pin 14?
                                By the way, what is the P/N of the Inverter controller IC?
                                Last edited by budm; 06-09-2012, 02:50 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


                                  #96
                                  Re: 42lg3000-za No Picture but got sound

                                  Budm
                                  post #11
                                  pin 10 on/off meter reads 2.9
                                  pin 11 pwm dim meter reads 0
                                  pin 12 n.c meter reads 0

                                  Comment


                                    #97
                                    Re: 42lg3000-za No Picture but got sound

                                    Originally posted by Jahson View Post
                                    selldoor you see the pix in post#86

                                    If you look in the center of board, it looks like bits of solder all over the gaff.
                                    I know whot you saying but this looks kinda unprofessional.
                                    Ones I have looked at are just the same

                                    Here is one example
                                    http://flattvparts.co.uk index.php?main_page=product_info&products_id=7884

                                    - google the board number and you can find others
                                    Please upload pictures using attachment function when ask for help on the repair
                                    http://www.badcaps.net/forum/showthread.php?t=39740

                                    Comment


                                      #98
                                      Re: 42lg3000-za No Picture but got sound

                                      Please see the redlined test points with reference to the chassis ground.
                                      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


                                        #99
                                        Re: 42lg3000-za No Picture but got sound

                                        By the way, do you see this?
                                        http://www.ohmsupplies.co.uk/REPAIR-...T7105354-LG-42
                                        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


                                          Re: 42lg3000-za No Picture but got sound

                                          Oops: duplicate
                                          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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