Panasonic TX-L42U3B dead screen and blinking standby lights

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  • smallprint
    Senior Member
    • Nov 2010
    • 86
    • UK

    #1

    Panasonic TX-L42U3B dead screen and blinking standby lights

    I'm currently looking at a Panasonic TX-L42U3B with a dead screen and just a blinking standby light 7 flashes a pause then 7 flashes anyone got any thoughts what the problem could be ?
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: Panasonic TX-L42U3B dead screen and blinking standby lights

    Can you take pictures of all the boards inside the tv please and what test equpitment do you have like multimeter ect cheers ?
    Last edited by ReeceyBurger123; 06-25-2015, 08:08 AM. Reason: Wrong information.
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment

    • smallprint
      Senior Member
      • Nov 2010
      • 86
      • UK

      #3
      Re: Panasonic TX-L42U3B dead screen and blinking standby lights

      Not yet i'm either gonna be picking it up tonight or tomorrow

      Comment

      • smallprint
        Senior Member
        • Nov 2010
        • 86
        • UK

        #4
        Re: Panasonic TX-L42U3B dead screen and blinking standby lights

        the woman who is after getting rid of it says they had a new tcon board fitted and it still doesn't work. She also said they still have the original board that they replaced. So for £30 i'm just wondering if it's worth a punt as the parts for it seem quite cheap enough on flat tv parts website

        Comment

        • ReeceyBurger123
          Never Give Up !
          • May 2014
          • 7325
          • Britain

          #5
          Re: Panasonic TX-L42U3B dead screen and blinking standby lights

          Originally posted by smallprint
          the woman who is after getting rid of it says they had a new tcon board fitted and it still doesn't work. She also said they still have the original board that they replaced. So for £30 i'm just wondering if it's worth a punt as the parts for it seem quite cheap enough on flat tv parts website
          What about backlight is that on ?
          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

          https://www.facebook.com/Telford-Tel...7894576335359/

          Comment

          • smallprint
            Senior Member
            • Nov 2010
            • 86
            • UK

            #6
            Re: Panasonic TX-L42U3B dead screen and blinking standby lights

            she says the only activity she getting is the flashing standby light

            Comment

            • smallprint
              Senior Member
              • Nov 2010
              • 86
              • UK

              #7
              Re: Panasonic TX-L42U3B dead screen and blinking standby lights

              i'm presuming that it's the 7 light flashes although she says it's 14 she didn't say there was a pause in between. I've also read elsewhere to try and hold the power button in for up to 30 seconds as a fix too !

              Comment

              • smallprint
                Senior Member
                • Nov 2010
                • 86
                • UK

                #8
                Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                deffo not the TCON board and deffo 14 flashes on the standy led no activity on the lcd screen either !

                Comment

                • ReeceyBurger123
                  Never Give Up !
                  • May 2014
                  • 7325
                  • Britain

                  #9
                  Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                  Right so there is no backlight ?
                  Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                  https://www.facebook.com/Telford-Tel...7894576335359/

                  Comment

                  • smallprint
                    Senior Member
                    • Nov 2010
                    • 86
                    • UK

                    #10
                    Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                    nope nothing at all i've tried changing the fuse on the power supply board too
                    and still nothing not even a flicker and still the 14 flashing lights on the front panel

                    Comment

                    • smallprint
                      Senior Member
                      • Nov 2010
                      • 86
                      • UK

                      #11
                      Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                      here's some pics of the back of the set

                      Comment

                      • smallprint
                        Senior Member
                        • Nov 2010
                        • 86
                        • UK

                        #12
                        Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                        Again

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                          I don't trust a word when someone says, "it just needs XYZ", they very rarely know what they are talking about.
                          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

                          • smallprint
                            Senior Member
                            • Nov 2010
                            • 86
                            • UK

                            #14
                            Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                            it won't let me post attachments at the moment. The guy i spoke to said he'd had it in at a tv repair shop nearby and he'd had a look at it (Alledgedly) he had it for 6 weks and he reckoned it was the tcon board. The guy went out and bought a tcon board from ebay and the repair guy reckoned he couldn't fit it and give him a warranty on on the repair if the part was second hand. Sounds to me he was just fobbing him off any how o've just tried the said part and there's no difference at all with either board. My guess is either the power supply or the inverter or maybe the mainboard. I can't see any burst caps on the power supply and none of them seem to be bulging or leaking.

                            Comment

                            • smallprint
                              Senior Member
                              • Nov 2010
                              • 86
                              • UK

                              #15
                              Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                              here's the pics
                              Attached Files

                              Comment

                              • smallprint
                                Senior Member
                                • Nov 2010
                                • 86
                                • UK

                                #16
                                Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                                and some more
                                Attached Files

                                Comment

                                • smallprint
                                  Senior Member
                                  • Nov 2010
                                  • 86
                                  • UK

                                  #17
                                  Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                                  and the rest
                                  Attached Files

                                  Comment

                                  • smallprint
                                    Senior Member
                                    • Nov 2010
                                    • 86
                                    • UK

                                    #18
                                    Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                                    Can't find a service manual anywhere for this set even on elktrotanya

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                                      This is the training guide for the US models in the 2011 "30" series, it should be roughly similar:


                                      Error codes on page 44/46.
                                      Last edited by tom66; 06-26-2015, 04:13 PM.
                                      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

                                      • smallprint
                                        Senior Member
                                        • Nov 2010
                                        • 86
                                        • UK

                                        #20
                                        Re: Panasonic TX-L42U3B dead screen and blinking standby lights

                                        According to that it says 14 blinks is the mainboard faulting IROM SOS

                                        Comment

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