phillips lcd keeps blowing fuse

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #121
    Re: phillips lcd keeps blowing fuse

    Not 100% for sure since bad lamp (one or more may not be on) can also cause shutdown.
    Also, you have indicated earlier that you still cannot turn the TV off per post 81, unless I read it wrong.
    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

    • TimT
      Badcaps Veteran
      • Nov 2012
      • 268
      • us

      #122
      Re: phillips lcd keeps blowing fuse

      The Tv does turn off. I was responding to a question someone asked if the TV turned off " on it's own " . the Tv functions correctly menu, volume, channels, ect. turns off and on with power button. everything works except backlight.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #123
        Re: phillips lcd keeps blowing fuse

        I would try new inverter board at this point if it is cheap enough.
        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

        • TimT
          Badcaps Veteran
          • Nov 2012
          • 268
          • us

          #124
          Re: phillips lcd keeps blowing fuse

          found one on ebay for $35 shipped! will install and report back thanks for your help!!!

          Comment

          • TimT
            Badcaps Veteran
            • Nov 2012
            • 268
            • us

            #125
            Re: phillips lcd keeps blowing fuse

            install the new inverter board still the same issue

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #126
              Re: phillips lcd keeps blowing fuse

              That is not good news, sorry to hear that. I do not see what else it can be, since it has all the required voltages and signals. Inspecting the lamp assembly will be the next thing to do. Not sure if it will be worth it at this point.
              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

              • TimT
                Badcaps Veteran
                • Nov 2012
                • 268
                • us

                #127
                Re: phillips lcd keeps blowing fuse

                it will be a learning experience for me so I will do this in the morning. I love to tinker! Even when I don't know what I'm doing
                Last edited by TimT; 01-05-2013, 09:22 PM.

                Comment

                • TimT
                  Badcaps Veteran
                  • Nov 2012
                  • 268
                  • us

                  #128
                  Re: phillips lcd keeps blowing fuse

                  ok I got the screen removed. the bulbs " look " good. if one was bad would that cause this issue? and if so how do i test them?

                  Comment

                  • TimT
                    Badcaps Veteran
                    • Nov 2012
                    • 268
                    • us

                    #129
                    Re: phillips lcd keeps blowing fuse

                    I put the inverter and t-con back in and attached power. I can confirm the all bulbs do light up. still a quick flash of light

                    Comment

                    • selldoor
                      Slow Learner
                      • Dec 2010
                      • 7870

                      #130
                      Re: phillips lcd keeps blowing fuse

                      Originally posted by TimT
                      ok I got the screen removed. the bulbs " look " good. if one was bad would that cause this issue? and if so how do i test them?
                      Yes - one bad could cause them all to cut out.

                      Not conclusive perhaps rig a couple of Budms test lamps?
                      https://www.badcaps.net/forum/showthread.php?t=19987
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment

                      • TimT
                        Badcaps Veteran
                        • Nov 2012
                        • 268
                        • us

                        #131
                        Re: phillips lcd keeps blowing fuse

                        can I hook up a 9v battery to test the lamps?

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870

                          #132
                          Re: phillips lcd keeps blowing fuse

                          Pretty certain the answer is NO. The lamps usually run at something like 1200vAC
                          provided by the inverter transformers. - If you meant to power the inverter transformers?
                          the answer is still no. You can get bulb testers - (basically an inverter) or even an inverter board on ebay - but I am not sure if they will power those tubes as they will be quite long?
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                          Comment

                          • Dgtech
                            E. Technician
                            • Apr 2009
                            • 1462
                            • Steeler

                            #133
                            Re: phillips lcd keeps blowing fuse

                            You started working on this TV exactly a month ago. A lot of man hours went into this thing and it's only a 40 Inch LCD TV. I know it's hard to give up on things but there are a lot easier repairs out there just waiting for you. Set this one aside and move on, if you can. I've even put them back together and sold them as non working sets the same way that I bought them off of CL. I would end up getting the same amount of money that I bought it for in the same condition. Minimize your losses.

                            Like I said before, there are a lot of easy repairs out there of larger TV's. You will do fine with those.
                            The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                            Comment

                            • MisterD
                              Badcaps Veteran
                              • Oct 2012
                              • 668
                              • United States

                              #134
                              Re: phillips lcd keeps blowing fuse

                              Okay, originally you had a power supply problem with it blowing the line fuse, you replaced the power supply board, do you still have the old board? please verify that the white barcode stickers match on both boards, these stickers are the correct part number, the number on the actual board is the part number of the bare board without any components, I'm just wondering if you have a replacement power supply board that mounts and connects and looks the same but could be different in some respect and is causing then inverter power ( high voltage to shut down) I may be wrong but it doesn't hurt to check it out, also has anyone else worked on this set prior to you? Make sure your replacement inverter and power supply boards are in fact the correct ones.
                              Last edited by MisterD; 01-06-2013, 11:36 AM.

                              Comment

                              • MisterD
                                Badcaps Veteran
                                • Oct 2012
                                • 668
                                • United States

                                #135
                                Re: phillips lcd keeps blowing fuse

                                Originally posted by TimT
                                I put the inverter and t-con back in and attached power. I can confirm the all bulbs do light up. still a quick flash of light
                                Can you see where the bulbs plug into their sockets? maybe one or more is not seated all the way in?

                                Comment

                                • TimT
                                  Badcaps Veteran
                                  • Nov 2012
                                  • 268
                                  • us

                                  #136
                                  Re: phillips lcd keeps blowing fuse

                                  MisterD I still have the old board I will check the stickers. DJtech you are correct. This is more of a hobby to me I dont do this for the money.

                                  I pulled the inverter board and reinstalled with inverter " contact clips " resting on the plastic fittings. then installed the mounting screws. this way the inverter was not in contact with the bulbs. tested this and the same issue..so im lost! pulled T-con & tested still the same. pulled cable from inverter and retested BL_sw jumps to 3v when blacklight " should kick in "

                                  Comment

                                  • TimT
                                    Badcaps Veteran
                                    • Nov 2012
                                    • 268
                                    • us

                                    #137
                                    Re: phillips lcd keeps blowing fuse

                                    bulbs seem to be seated tight!

                                    Comment

                                    • TimT
                                      Badcaps Veteran
                                      • Nov 2012
                                      • 268
                                      • us

                                      #138
                                      Re: phillips lcd keeps blowing fuse

                                      That may be it! ordered this part. http://www.encompassparts.com/item/8...on-returnable) should have got this.
                                      http://www.encompassparts.com/item/8...wer_Supply_Cba

                                      all the voltage out of boards are the same.. did not see the YA1/YA3 in serial #

                                      Comment

                                      • selldoor
                                        Slow Learner
                                        • Dec 2010
                                        • 7870

                                        #139
                                        Re: phillips lcd keeps blowing fuse

                                        Doesnt matter which board you ordered when you plug it in it should not go Bang.

                                        UNLESS you had it standing on a conductive surface?

                                        In any case its says both are compatible with your set. Power boards - if the connectors are right ar less fussy than main boards.

                                        EDIT

                                        By the way did you read the service note - does your board have that diode?
                                        Last edited by selldoor; 01-06-2013, 01:39 PM.
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

                                        • MisterD
                                          Badcaps Veteran
                                          • Oct 2012
                                          • 668
                                          • United States

                                          #140
                                          Re: phillips lcd keeps blowing fuse

                                          I have a 40" Emerson with a cracked LCD Panel/Screen,it powers on with everything working, I can actually make out part of the picture on the screen, it was given to me and I have not disassembled it as of yet, attached picture of chassis with back removed, it appears to be very similar to your philips, I believe that Philips/Magnavox and Emerson are all made by the same Company, I'm wondering if there are any voltages I can check on mine (working) to compare with yours (no backlights) that would actually help in your diagnosis, maybe Bud or Tom can advise.
                                          The middle darker picture is the sticker for the LCD Panel.
                                          Attached Files

                                          Comment

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