42px5d-eb no picture

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #1

    42px5d-eb no picture

    hi all
    I have here a 42px5d
    the set powers up with no picture not sure on sound as the imput wont switch to hdmi only idtv

    opened the set up up all voltages from psu are fine check out ok
    vs va etc all as it should be

    so I checked fuses on x and y board

    x fuses are fine
    y fuse isn't the one closest to the ipm is blown this is a 250v 4a fuse
    thing is I replaced it with a 250v 3a fuse but set wont turn on turnson clicks the relay then back to standby

    do you think if I put in a 4a fuse it would work I don't have one atm but will get
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: 42px5d-eb no picture

    Nope. The IPM is bad. Replacing the fuse has just put a short circuit across power supply. You need to replace IPM -- difficult job. Or replace Y-sus -- if you can find one.
    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

    • wreksta
      Badcaps Veteran
      • Aug 2013
      • 508
      • england

      #3
      Re: 42px5d-eb no picture

      id prefer to replace ipm im quite good wth a soldering iron

      Comment

      • wreksta
        Badcaps Veteran
        • Aug 2013
        • 508
        • england

        #4
        Re: 42px5d-eb no picture

        will replacing ipm deffinatley fix the set
        and this one isnt soldered both sides or is it

        anything else to check mate before replacing the ipm
        Last edited by wreksta; 09-17-2013, 06:57 AM.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: 42px5d-eb no picture

          Quite good -- well it depends on your definition but you really need to be confident in removing a 30pin+ IC which is heatsinked on both the board and the top, and has very large heat-sucking copper traces. Yes, it is soldered both sides so you really need to suck the solder out good.

          I could not do it; one of the reasons I don't bother with these awful IPM LGs.

          If you can't do it properly, be sure not to damage the board. The sustain boards are virtually unobtainable, if you damage it beyond 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

          • wreksta
            Badcaps Veteran
            • Aug 2013
            • 508
            • england

            #6
            Re: 42px5d-eb no picture

            bit the bullet got another ysus and buffer

            but now set refuses to turn on and I have no reading at power board

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: 42px5d-eb no picture

              Don't rule out your new Y-sus being bad. Test IPM for shorts from VS to GND, VS to SUS OUT and GND to SUS OUT.
              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

              • wreksta
                Badcaps Veteran
                • Aug 2013
                • 508
                • england

                #8
                Re: 42px5d-eb no picture

                done that on ipm fuses are stil good but I have no voltages with this board in place

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: 42px5d-eb no picture

                  Check VS to GND on Y-sus then.
                  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

                  • wreksta
                    Badcaps Veteran
                    • Aug 2013
                    • 508
                    • england

                    #10
                    Re: 42px5d-eb no picture

                    all voltages normal now no fuses popped but still no screen

                    how do you check buffers on these
                    or any other checks I should carry out

                    Comment

                    • attainteddragon
                      Badcaps Veteran
                      • Apr 2013
                      • 764
                      • australia

                      #11
                      Re: 42px5d-eb no picture

                      hey wrek, you need to do resistance checks on the ipm.
                      remove the board to access the legs of the ipm.
                      WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                      Comment

                      • wreksta
                        Badcaps Veteran
                        • Aug 2013
                        • 508
                        • england

                        #12
                        Re: 42px5d-eb no picture

                        dne that mate cheers theres no short im considering changing ipm but theres something got to be at fault on this board

                        Comment

                        • attainteddragon
                          Badcaps Veteran
                          • Apr 2013
                          • 764
                          • australia

                          #13
                          Re: 42px5d-eb no picture

                          if you have voltage at the fuse and it hasnt blown, and your ipm has checked good,
                          if this set has two buffer boards, disconnect one and see if you get half a picture.
                          some photos would be good.
                          WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                          Comment

                          • wreksta
                            Badcaps Veteran
                            • Aug 2013
                            • 508
                            • england

                            #14
                            Re: 42px5d-eb no picture

                            I have 1 buffer mate I disconnected yboard from buffer can I run it like this cause I tried and heard pop cant locate nothing or smell anything
                            ill post some pics soon

                            emos tv parts have agreed to a refund but I want this working not my money bk

                            Comment

                            • wreksta
                              Badcaps Veteran
                              • Aug 2013
                              • 508
                              • england

                              #15
                              Re: 42px5d-eb no picture

                              tom is it bad to test tv without buffer connected to y board

                              well turns out this board is defective but I aint got time to wait for a replacement so im going to switch ipms and hope

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: 42px5d-eb no picture

                                No problem without buffer connected.
                                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

                                • wreksta
                                  Badcaps Veteran
                                  • Aug 2013
                                  • 508
                                  • england

                                  #17
                                  Re: 42px5d-eb no picture

                                  well I transferred the ipm and theres no shorts n it I checked but still no picture any clues

                                  I wil try swapng the other buffer in all voltages are correct from psu to ymain
                                  z main etc


                                  what am I missing

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: 42px5d-eb no picture

                                    What volts across any one of the bank of red poly capacitors near the IPM?
                                    Pics would help as we are working blind here.
                                    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

                                    • wreksta
                                      Badcaps Veteran
                                      • Aug 2013
                                      • 508
                                      • england

                                      #19
                                      Re: 42px5d-eb no picture

                                      tom here some pictures







                                      which poly cap do you mean and across whats that mean grnd and then the positive on the leg or both leads on either end

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: 42px5d-eb no picture

                                        Across here.
                                        Putting both leads on one end would lead to a reading of zero.
                                        Put one lead on one end, one on other. Ignore negative sign on meter.

                                        If Y-sus is working, expect around 50 to 150V DC. Should match Z-sus.
                                        Attached Files
                                        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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