Panasonic TX-P42U30B green light flashes no picture

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  • Andyd1970
    Badcaps Veteran
    • Feb 2013
    • 374
    • united kingdom
    #1

    Panasonic TX-P42U30B green light flashes no picture

    Hi Guys,

    Just bought a Panasonic TX-P42U30B to be used in the bedroom from a guy for £40.00 as not working. Basically you power it up you hear a relay clicking a few times the green light flashes and then nothing. I was hoping bad caps but when I stripped it they all seem OK.

    So I started to check for voltages, I put one probe onto the chassis and checked for voltages coming from bottom right connector on PSU to main PCB and the top left and top right connectors on PSU going to the inverters? (I guess it cant have two inverter PCB's). All I was getting was MV.

    I have a digitial meter happy to recheck voltages etc.


    Help Andy
    Attached Files
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    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Panasonic TX-P42U30B green light flashes no picture

      It's most likely an A board fault.
      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

        • Andyd1970
          Badcaps Veteran
          • Feb 2013
          • 374
          • united kingdom
          #3
          Re: Panasonic TX-P42U30B green light flashes no picture

          HI Tom, Which board is the A board please?

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Panasonic TX-P42U30B green light flashes no picture

              The one with the video inputs on it.
              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

                • Andyd1970
                  Badcaps Veteran
                  • Feb 2013
                  • 374
                  • united kingdom
                  #5
                  Re: Panasonic TX-P42U30B green light flashes no picture

                  OK, Is there a way to prove it? would it be wise to remove connectors etc and check voltages?

                  Andy

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Panasonic TX-P42U30B green light flashes no picture

                      Unplug SC power: should go to 6/7 blinks.
                      Reconnect SC, Unplug SS: should go to 8 blinks.

                      That eliminates the sustain boards, but doesn't totally rule out another board causing issues. If no error codes fire up it's most likely an A board fault.
                      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

                        • Andyd1970
                          Badcaps Veteran
                          • Feb 2013
                          • 374
                          • united kingdom
                          #7
                          Re: Panasonic TX-P42U30B green light flashes no picture

                          Hi Tom, Which PCB is SC and SS ?

                          Andy

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Panasonic TX-P42U30B green light flashes no picture

                              SC = SN on this, left of screen connected to panel ribbons.
                              SS = right of screen connected to panel ribbons.
                              Do not unplug panel ribbons or white flex cable.
                              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

                                • sordids999
                                  Badcaps Legend
                                  • May 2013
                                  • 2161
                                  • uk
                                  #9
                                  Re: Panasonic TX-P42U30B green light flashes no picture

                                  might be buying this tonight displays 6 flashing lights when you try to turn it on any ideas read it could be a possible SC BOARD ?

                                  thanks

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK
                                      #10
                                      Re: Panasonic TX-P42U30B green light flashes no picture

                                      SC or A board in most cases.
                                      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

                                        • sordids999
                                          Badcaps Legend
                                          • May 2013
                                          • 2161
                                          • uk
                                          #11
                                          Re: Panasonic TX-P42U30B green light flashes no picture

                                          ok tom thanks ill post some pictures later if i get it

                                            Comment

                                            • 1967tux
                                              Member
                                              • Dec 2014
                                              • 29
                                              • uk
                                              #12
                                              Re: Panasonic TX-P42U30B green light flashes no picture

                                              hi tom i have the same problem but green light stays on unpluged sn 7 blinks but when i unpluged ss no change does this mean faulty ss board?

                                                Comment

                                                • tom66
                                                  EVs Rule
                                                  • Apr 2011
                                                  • 32560
                                                  • UK
                                                  #13
                                                  Re: Panasonic TX-P42U30B green light flashes no picture

                                                  Probably SN, check for shorted IGBTs/FETs.
                                                  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

                                                    • 1967tux
                                                      Member
                                                      • Dec 2014
                                                      • 29
                                                      • uk
                                                      #14
                                                      Re: Panasonic TX-P42U30B green light flashes no picture

                                                      hi tom sorry when i unplug the ss when i say no change i meant the i get the green light just staying on no but not the 8 blink fault code.

                                                        Comment

                                                        • newtothis
                                                          Badcaps Legend
                                                          • Mar 2013
                                                          • 1556
                                                          • england
                                                          #15
                                                          Re: Panasonic TX-P42U30B green light flashes no picture

                                                          Aha same internals as the one I am currently working on!

                                                            Comment

                                                            • 1967tux
                                                              Member
                                                              • Dec 2014
                                                              • 29
                                                              • uk
                                                              #16
                                                              Re: Panasonic TX-P42U30B green light flashes no picture

                                                              sorted this one now faulty ss board had shorted IGBTs/FETs. sent off for repair refitted and bingo all up and working! thanks guys for your help

                                                                Comment

                                                                • tw2005
                                                                  Badcaps Legend
                                                                  • Oct 2011
                                                                  • 6458
                                                                  • Australia
                                                                  #17
                                                                  Re: Panasonic TX-P42U30B green light flashes no picture

                                                                  Originally posted by 1967tux
                                                                  sorted this one now faulty ss board had shorted IGBTs/FETs. sent off for repair refitted and bingo all up and working! thanks guys for your help
                                                                  thanks for the info, any way of tell what parts were replaced besides those igbts? any of the samler stuff touch like small 8 pin driver ics/

                                                                    Comment

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