panasonic tx-p50s10b

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  • ronhayes
    TV Engineer
    • Mar 2014
    • 458
    • UK

    #1

    panasonic tx-p50s10b

    Hi All
    After following instructions on flow chart Kindly supplied by TW2005 no relays clicking disconnected plugs as instructed and checked volts at pins on plugs p7 and a6 it advices to replace P board.
    What i was wandering was there any known faults on this board that may now have been discovered or do you have to replace these boards still ?

    Ronhayes
    [/ATTACH][/ATTACH]
    Attached Files
  • Alastair E
    Chief Womble
    • Mar 2013
    • 1963
    • U.K.

    #2
    Re: panasonic tx-p50s10b

    Ive had the Va/Vs switching MOSFETS fail S/C taking out the fuse....
    TELEFIX

    How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
    http://www.irf.com/technical-info/appnotes/an-1088.pdf
    PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

    Comment

    • ronhayes
      TV Engineer
      • Mar 2014
      • 458
      • UK

      #3
      Re: panasonic tx-p50s10b

      I have checked the fuses on the P board all seem ok.

      Comment

      • Alastair E
        Chief Womble
        • Mar 2013
        • 1963
        • U.K.

        #4
        Re: panasonic tx-p50s10b

        Only thing to do is the usual fault-find process--just like any other PSU. Check Tom's site for schematics of set.....
        Last edited by Alastair E; 04-15-2015, 02:41 PM.
        TELEFIX

        How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
        http://www.irf.com/technical-info/appnotes/an-1088.pdf
        PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

        Comment

        • ronhayes
          TV Engineer
          • Mar 2014
          • 458
          • UK

          #5
          Re: panasonic tx-p50s10b

          Hi Alastair E
          In your last response to me you said to check Tom's site for schematics of set. Do you mean Tom 66 and if so do you have link to his site ? And also should i contact him first before going to his site? and ask for his permission to visit his site.
          Regards Ron

          Comment

          • vinceroger69
            Badcaps Legend
            • Mar 2012
            • 6714
            • uk

            #6
            Re: panasonic tx-p50s10b

            http://www.toms-service-manuals.com/

            Comment

            • ronhayes
              TV Engineer
              • Mar 2014
              • 458
              • UK

              #7
              Re: panasonic tx-p50s10b

              Thank you vinceroger69.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: panasonic tx-p50s10b

                No permission required
                If all fuses are good & relays not clicking, check 5V standby.
                If absent = concentrate on PSU.
                If not absent = check A board signals, could be bad A board not sending power on signal, etc.
                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

                • ronhayes
                  TV Engineer
                  • Mar 2014
                  • 458
                  • UK

                  #9
                  Re: panasonic tx-p50s10b

                  Hi Tom
                  Thank you for your input .
                  I have checked the 5v stby on pin 5 of p7 on p board and i get 4.73 at switch on so should i assume that the fault is with the A board?
                  Ron

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: panasonic tx-p50s10b

                    It would be the place I would concentrate on, though 4.73V is quite low for a 5V rail...
                    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

                    • paulstef
                      Badcaps Veteran
                      • Dec 2013
                      • 724
                      • Canada

                      #11
                      Re: panasonic tx-p50s10b

                      Originally posted by ronhayes
                      Hi Tom
                      Thank you for your input .
                      I have checked the 5v stby on pin 5 of p7 on p board and i get 4.73 at switch on so should i assume that the fault is with the A board?
                      Ron
                      Please post a photograph of the the area with the two connectors to the right. There should be a description of each pin printed on top or bottom of the PCB.

                      Is this your chassis? http://elektrotanya.com/panasonic_tc.../download.html
                      Last edited by paulstef; 04-21-2015, 07:39 AM.

                      Comment

                      • paulstef
                        Badcaps Veteran
                        • Dec 2013
                        • 724
                        • Canada

                        #12
                        Re: panasonic tx-p50s10b

                        In my previous post there is a link to document containing the schematic of the PSU as well. You can't have it any better than that. It's supposed to be the ETX2MM747MFG.
                        Can you confirm?

                        I attached two pictures of the connectors where you should measure the signals.

                        Measure all the signals on P7 and P25 while the set is in standby and while you try to turn it on. It's important to post any changes that the signals show, like first it's 0V, then after 2sec it's 5V etc.
                        Attached Files
                        Last edited by paulstef; 04-21-2015, 07:51 AM.

                        Comment

                        • ronhayes
                          TV Engineer
                          • Mar 2014
                          • 458
                          • UK

                          #13
                          Re: panasonic tx-p50s10b

                          Hi Paul
                          Yes on the P board it is marked ETX2MM747MF and large letter G on white label just at the end of board number.
                          I have added pictures as you asked but no description on boards as you can see.










                          Attached Files

                          Comment

                          • ronhayes
                            TV Engineer
                            • Mar 2014
                            • 458
                            • UK

                            #14
                            Re: panasonic tx-p50s10b

                            Hi Paulstef
                            I see what you are advising but when the P board is connected it is not possible to take measurements from these points as the solder point is under the board ( I would need to solder extension pins on so i could measure in situ) would that be the way you would go?
                            or take the measurements on the A board as it is possible on that board but would have to track each wire to each pin ?
                            Also in the schematics it quotes to A6 and A25 but on my A board the plugs are marked up A7 and A25 but i assume A7 is A6?

                            Comment

                            • paulstef
                              Badcaps Veteran
                              • Dec 2013
                              • 724
                              • Canada

                              #15
                              Re: panasonic tx-p50s10b

                              You should be able to measure directly on the connector from above, where the wire was crimped to the terminal.

                              If your probe doesn't enter use an alligator clip with a rigid wire attached to it.
                              Attached Files

                              Comment

                              • ronhayes
                                TV Engineer
                                • Mar 2014
                                • 458
                                • UK

                                #16
                                Re: panasonic tx-p50s10b

                                I have measured volts on connectors P 7 and P 25 volts as follows:-
                                P 7 = PINS 1,2,3,4,6,7,10,11= 0V STBY press button wait 2 seconds or more still 0v pin 5 STBY 0v press button 4.73v pin 8 0v STBY press button 2.84v for one second then 0v pin 9 STBY 0v press button 4.70v.
                                P 25 = pins 1,2,3,4,5,6,7,8,10,11,12,13 =0V STBY press button wait 2 seconds still 0v pin 9 = 0v STBY press button 4.73v

                                Comment

                                • ronhayes
                                  TV Engineer
                                  • Mar 2014
                                  • 458
                                  • UK

                                  #17
                                  Re: panasonic tx-p50s10b

                                  Would this point to the A board or the P board ?

                                  Comment

                                  • paulstef
                                    Badcaps Veteran
                                    • Dec 2013
                                    • 724
                                    • Canada

                                    #18
                                    Re: panasonic tx-p50s10b

                                    There are only two input signals from the mainboard, P7/pin6 (F_STBY_ON) and P25/pin11 (PANEL_Main_ON).

                                    The microcontroller obviously runs since the standby on button works, presumably connected to P34, right?
                                    It enables then STBY5V on P25/pin9 and P7/pin5. The mainboard is then supposed to send PANEL_Main_ON and F_STBY_ON, which it doesn't.

                                    It looks more like a A-board fault but I would still verify if the 5V standby voltage (or VDD at pin6 of IC701) is really supposed to be 4.73V.
                                    For this you need to tell us the values of R556 and R555 next to IC551. This determines the output voltage.

                                    If you have a scope measure also voltage ripple at this point.

                                    If the P-board is ok you would probably be able to start it manually disconnecting P25 and P7 from the A-board and manually activating PANEL_Main_ON and F_STBY_ON.
                                    I need to check in which sequence that's supposed to happen.
                                    Attached Files
                                    Last edited by paulstef; 04-21-2015, 02:37 PM.

                                    Comment

                                    • paulstef
                                      Badcaps Veteran
                                      • Dec 2013
                                      • 724
                                      • Canada

                                      #19
                                      Re: panasonic tx-p50s10b

                                      Does the power LED blink or is it always off?

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: panasonic tx-p50s10b

                                        I still think the 4.73V needs investigation - it is too low for a 5V rail, and could potentially trigger some kind of under-voltage lock-out (unlikely, but worth considering)
                                        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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