Panasonic TH-42PX8EA ( only starts from cold )

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  • alancilia
    Member
    • Apr 2013
    • 25
    • malta

    #1

    Panasonic TH-42PX8EA ( only starts from cold )

    Hi

    I have this 42" Plasma Tv it will come on and work normally when cold
    but if you leave it for 15 min switch it off and than back on the
    back light comes on but no picture on screen is displayed .

    I think it is something from the Main board ( TNPH0711 ).

    Any help will be much Appreciated .

    Thanks in advance .
    Attached Files
    Last edited by alancilia; 05-18-2015, 02:54 PM.
  • newtothis
    Badcaps Legend
    • Mar 2013
    • 1556
    • england

    #2
    Re: Panasonic TH-42PX8EA ( only starts from cold )

    Pictures of all boards and layout of back of set please.

    Also noted that the main has been recapped previously, did you do this?
    Last edited by newtothis; 05-18-2015, 03:53 PM.

    Comment

    • alancilia
      Member
      • Apr 2013
      • 25
      • malta

      #3
      Re: Panasonic TH-42PX8EA ( only starts from cold )

      hi

      Thanks for your reply .

      Yes I have replace most of the electrolytics found them to have high ESR
      but that was not the fault .

      I will upload the pictures and service manual tomorrw as i am not in the workshop right now .

      Comment

      • newtothis
        Badcaps Legend
        • Mar 2013
        • 1556
        • england

        #4
        Re: Panasonic TH-42PX8EA ( only starts from cold )

        Would be helpful

        Just for future : The cap that is practically resting against the IC... Move it. If that cap bulges at any point you can be certain the venting cap will touch the pins of that IC and short it out

        Comment

        • alancilia
          Member
          • Apr 2013
          • 25
          • malta

          #5
          Re: Panasonic TH-42PX8EA ( only starts from cold )

          Hi

          here is the the link for the service manual :

          http://manualmachine.com/download.ph...u94XhNvonh5BLw

          and below find a picture of the tv .

          Thanks
          Attached Files

          Comment

          • alancilia
            Member
            • Apr 2013
            • 25
            • malta

            #6
            Re: Panasonic TH-42PX8EA ( only starts from cold )

            Hi

            At this point I am going to try replacing the main board , I did found the main
            board with the same part number but , the seller say that it was being used
            on another Tv Model ( but still 42" PANASONIC TH42PX80 )

            here is the link to the seller :

            http://www.ebay.com/itm/TXN-A1RRTD-T...item4d2fa9d8e2

            Anyone can tell if this board will work on my TV ?

            Thanks

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Panasonic TH-42PX8EA ( only starts from cold )

              If you have digital TV on this set, it may not work with different main board
              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

              • alancilia
                Member
                • Apr 2013
                • 25
                • malta

                #8
                Re: Panasonic TH-42PX8EA ( only starts from cold )

                Hi Tom,

                Good morning and thanks for your reply,

                I have just ordered The main board which seems to be Identical :

                http://www.ebay.com/itm/151658231235...%3AMEBIDX%3AIT

                I will post the outcome as soon as the board arrives ,

                I will also Add this fault to the Fault Database with a link to this tread.

                http://fault-database.host56.com/Faults/

                Everyone is welcome to Join and add new fault entries .

                Comment

                • alancilia
                  Member
                  • Apr 2013
                  • 25
                  • malta

                  #9
                  Re: Panasonic TH-42PX8EA ( only starts from cold )

                  Hi

                  so the Main-board just arrived , installed it and I got 7 red blinks from the front
                  LED checked on the service manual for this error and found that it got to be something with all the boards surrounding the main-board excluding the PSU

                  so I figured out the the board was expecting voltages of another TV Size
                  so it was a Firmware problem .

                  What i did is I swapped the Flash chip from the old main board containing the firmware , and finally the Tv Powers ON !! but than i discovered that Now I have a Geometry Problem , found out which EEprom was containing the geometry and swapped it from the old BOARD FINALLY it was ALL OK !!

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Panasonic TH-42PX8EA ( only starts from cold )

                    Nice! Thanks for feedback on the 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

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