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42lg3000-za No Picture but got sound

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    #21
    Re: 42lg3000-za No Picture but got sound

    The fuses on the master & slave inverters are ok, the same as touching the two probes together.

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      #22
      Re: 42lg3000-za No Picture but got sound

      I did try taking new pictures outdoors but thing even worst.

      the camera is a vivitar vivicam 7025 ( a waste of money )

      Outdoor shots
      Attached Files
      Last edited by Jahson; 06-02-2012, 11:54 AM.

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        #23
        Re: 42lg3000-za No Picture but got sound

        in above pics number 1 by the two yellow toped transformers there are some orange items i think these are some type of fuses cant zoom in on the pics to read board part numbers but if these items start with a f number test all of these items 11 i think
        better pictures will help us all.

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          #24
          Re: 42lg3000-za No Picture but got sound

          Yea i see them, part numbers first been under left most transformer

          fb603 ,fb606 ,fb604, fb605, fb607, fb608

          then under the heatsink in the middle fb101, then to the right next to the other transormer fb502,

          in the center of board fb500,

          bottom left hand side fb102, fb105, fb104, fb103,

          then to the very far right next to were the writing is about input-output is fb203.

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            #25
            Re: 42lg3000-za No Picture but got sound

            My suggestion would be an old Nikon Coolpix or Canon Powershot, I got my Coolpix for £35 and it takes superb macro photos of PCBs.

            But anyway I can see one fuse, it's the white object next to the power connector on the inverter board, what does this measure at? (On 200 ohms.)
            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.

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              #26
              Re: 42lg3000-za No Picture but got sound

              Those orange objects are ferrite beads not fuses. They are used to suppress interference generated by some parts of the board. Unlikely to be the fault. If you want, check them all for ohms, they should measure the same as touching probes together.
              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.

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                #27
                Re: 42lg3000-za No Picture but got sound

                All checked all ok

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                  #28
                  Re: 42lg3000-za No Picture but got sound

                  cheers tom i always wondered what the orange items were so am i rigt in thinking f on a board item fuse fb ferrite bead? and i also have just got a nikon coolpix camera of ebay £15.00 good bargain takes great pics.
                  Last edited by vinceroger69; 06-02-2012, 12:26 PM.

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                    #29
                    Re: 42lg3000-za No Picture but got sound

                    On the inverter boards master is part number f2 its ok reads same as touching both probes together 00.3, slave is part number f200 also the same reading.

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                      #30
                      Re: 42lg3000-za No Picture but got sound

                      Those fb's (ferrite beads) read same as touching probes

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                        #31
                        Re: 42lg3000-za No Picture but got sound

                        Are you getting good 24V to the inverters? Test with one end on the fuse (either end) and one end on the case, set meter to 200V DC.
                        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.

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                          #32
                          Re: 42lg3000-za No Picture but got sound

                          wrong post ignore please

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                            #33
                            Re: 42lg3000-za No Picture but got sound

                            Also found 2 more marked fb just above the fuse in the middle of board black looking, fb501, fb505, they both ok.

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                              #34
                              Re: 42lg3000-za No Picture but got sound

                              Do you want me to connect all the boards back up to tv, and check. Or just the powerboard.

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                                #35
                                Re: 42lg3000-za No Picture but got sound

                                Originally posted by Jahson View Post
                                Do you want me to connect all the boards back up to tv, and check. Or just the powerboard.
                                Connect everything up like the TV would be normally and check. Certain LG TVs (and in general those using the LG.Philips display panels) of this generation have a problem with the inverter driver IC failing. If you have good 24V it could be this IC which has failed.
                                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.

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                                  #36
                                  Re: 42lg3000-za No Picture but got sound

                                  yea master & slave inverters getting 24v, on pins 1, 2, 3, 4, 5.

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                                    #37
                                    Re: 42lg3000-za No Picture but got sound

                                    Originally posted by Jahson View Post
                                    yea master & slave inverters getting 24v, on pins 1, 2, 3, 4, 5.
                                    Okay you see those black two-leg plus tab devices? They look like this:
                                    http://media.digikey.com/photos/STMi...PAK,TO-252.jpg

                                    Can you read off the part # on the device?
                                    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


                                      #38
                                      Re: 42lg3000-za No Picture but got sound

                                      tom66 which board im looking for these parts on?

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                                        #39
                                        Re: 42lg3000-za No Picture but got sound

                                        Originally posted by Jahson View Post
                                        tom66 which board im looking for these parts on?
                                        Inverters.
                                        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


                                          #40
                                          Re: 42lg3000-za No Picture but got sound

                                          ok i got dismantle, 5 mins i know from before theres like 8 on each, but its somthing like 150 on 4 of them, & 250 on the other 4. i dismantle now.

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