Bush PDP42TV006 Problem No Picture

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  • FritzCT
    Member
    • Nov 2013
    • 30
    • england

    #21
    Re: Bush PDP42TV006 Problem No Picture

    Tom

    I've run into a problem. The power lead is chased into the wall and the only other one I have powers the PC.

    I'll have to grab one from work tomorrow.

    I assume you mean the left most connection marked Vs and I stick the probe down into the connector where the wire connects - I can just see the end of the exposed internals of the connector

    Many thanks

    Fritz

    Comment

    • FritzCT
      Member
      • Nov 2013
      • 30
      • england

      #22
      Re: Bush PDP42TV006 Problem No Picture

      Hi Tom

      Well I'm not sure I'm doing this right but when I put the probe in either of the pins marked Vs I'm getting a reading of 20 v which gradually drops off to zero over about a minute. I can hear some clicking and various lights come on then some go off again. There's also a crackling sound when I push the probe in but guess that could be as the probe connects. It's just once, then it goes.

      Attached is a photo of how I'm testing; how the meter is set; and also a couple of photos of the sticker on the back of the panel that I think is telling me what voltages I should get.

      Many thanks

      fritz
      Attached Files

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Bush PDP42TV006 Problem No Picture

        Is the red probe in the VOLT jack, black probe in COM?

        The PSU looks likely to be the fault, but there are some other tests that can be done.

        That connector goes to a board on one side of the plasma panel.

        There will be a board on the other side too.

        You need to unplug both big thick power connections to these boards then measure Vs.

        If it rises to 175V, you should then get sound (though this depends on if the set is switched to a source with sound and if all is connected right.)

        This will mean one of these boards is defective. Through process of elimination you can locate which one is defective. (Note, only change the connectors after switching off the set by unplugging it, and leaving it alone for 5 minutes, or damage/arcing may occur when reconnecting.)
        Last edited by tom66; 11-15-2013, 01:21 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

        • FritzCT
          Member
          • Nov 2013
          • 30
          • england

          #24
          Re: Bush PDP42TV006 Problem No Picture

          Hi Tom

          Yes probes are connected correctly.

          I unplugged both connectors and re-tested all Vs pins and still get voltage dropping although it now peaks at about 50 v as the set is switched on but drops off much faster.

          Fritz

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: Bush PDP42TV006 Problem No Picture

            It would seem the fault is definitely with the power supply. It may have something to do with that bulged capacitor, so I would consider that first. What is the part # on power board (usually LJ44- or BN44-)? In many cases a new power board is cheaper than replacing parts, especially considering the time taken to diagnose and repair.
            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

            • FritzCT
              Member
              • Nov 2013
              • 30
              • england

              #26
              Re: Bush PDP42TV006 Problem No Picture

              Hi Tom

              The board number is LJ44-00068A. I can pick one up for about 50 pounds. I picked up a capacitor earlier for about two pounds. Do you think it's worth trying changing that to see what happens?

              Fritz

              Comment

              • newtothis
                Badcaps Legend
                • Mar 2013
                • 1556
                • england

                #27
                Re: Bush PDP42TV006 Problem No Picture

                I would certainly change the CAP before replacing the board at that cost

                Can you tell me what CAP you bought? Manufacturer... Will be written on the side.

                Comment

                • FritzCT
                  Member
                  • Nov 2013
                  • 30
                  • england

                  #28
                  Re: Bush PDP42TV006 Problem No Picture

                  Yep

                  Got it from RS

                  nichicon
                  33mF 450 v
                  CA(M)
                  105 C H1142

                  RS part no. is 7394589

                  I e-mailed them with the details off the blown one and that's what I got.

                  Many thanks

                  Fritz

                  Comment

                  • newtothis
                    Badcaps Legend
                    • Mar 2013
                    • 1556
                    • england

                    #29
                    Re: Bush PDP42TV006 Problem No Picture

                    Originally posted by FritzCT
                    Yep

                    Got it from RS

                    nichicon
                    33mF 450 v
                    CA(M)
                    105 C H1142

                    RS part no. is 7394589

                    I e-mailed them with the details off the blown one and that's what I got.

                    Many thanks

                    Fritz
                    Get that cap changed and see how you go.

                    I would suggest changing all caps on the board at some point though, generally if one has failed the others will follow suit shortly and its hassle and time wasting to keep opening the set up and ordering parts.. IMO anyway.

                    Good luck and keep us updated

                    Comment

                    • FritzCT
                      Member
                      • Nov 2013
                      • 30
                      • england

                      #30
                      Re: Bush PDP42TV006 Problem No Picture

                      Ok so I out the new cap in and still no picture. Basically the same symptoms BUT I now get 6 flashing LED instead of 7! If only I could reduce it to none I'd be laughing.

                      But seriously, I'm still getting the same voltage from Vs. 20 max and slowly dropping. with both VS plugs disconnected 50 V and reducing much faster.

                      Fritz

                      EDIT: Hold that thought, it's still 7 flashes. Is there a way I can check my soldering is good? Grasping at straws really though

                      EDIT 2: As it warms up I get 3 green LED very close to the power in connection and then when it trips 2 of those go out and I get a red LED on the other side of the board
                      Last edited by FritzCT; 11-15-2013, 05:54 PM.

                      Comment

                      • FritzCT
                        Member
                        • Nov 2013
                        • 30
                        • england

                        #31
                        Re: Bush PDP42TV006 Problem No Picture

                        Another update......

                        Couldn't sleep last night so I took the power board out and started testing components.

                        There is another cap that I'm getting no reading for . It's in the VE section of the board.

                        There might also be some blown resistors there and in the PFC section (where I changed the capacitor before) as well but I'm getting some really odd readings as in I check it once and get a reading, check it again a few minutes later and get no reading so I can't be sure which are blown and which are not. There's about 10 resistors like this.

                        Components cost I guess is about 12 pounds if I replaced everything that gives me no reading; second hand board 50 pounds; new set 300 pounds.

                        Not really sure which way to jump

                        Fritz

                        Comment

                        • newtothis
                          Badcaps Legend
                          • Mar 2013
                          • 1556
                          • england

                          #32
                          Re: Bush PDP42TV006 Problem No Picture

                          On my phone at the moment, will get back to you once I'm at my pc

                          Comment

                          • FritzCT
                            Member
                            • Nov 2013
                            • 30
                            • england

                            #33
                            Re: Bush PDP42TV006 Problem No Picture

                            Ok I found a used board for 42 pounds. The same model number but the Rev number is different.

                            Does that matter? If not I'm going to give the replacement board a run.

                            Fritz

                            Comment

                            • FritzCT
                              Member
                              • Nov 2013
                              • 30
                              • england

                              #34
                              Re: Bush PDP42TV006 Problem No Picture

                              So fitted the new psu and all seems ok.

                              Thanks for the help, much appreciated
                              Fritz

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: Bush PDP42TV006 Problem No Picture

                                Glad to hear, enjoy your TV.
                                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

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