Panasonic tx-p42s31b

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • newtothis
    Badcaps Legend
    • Mar 2013
    • 1556
    • england

    #1

    Panasonic tx-p42s31b

    Recently got hold of the above set, Upon plugging in I hear a series of relay clicks and standby LED blinks 5 - 6 times (Too quick to tell)

    PSU Checks out fine and is giving all correct voltages.

    I will upload pics shortly of the boards and chassis.

    I am not too familiar with Plasma sets but have done one with a buffer replace and sustain VR bank replacments. Due to this I am not familiar with the layout of the set as it looks very different to the older plasma I repaired last year.

    So little help with what is what and any idea will be great.

    Taking pictures now
  • newtothis
    Badcaps Legend
    • Mar 2013
    • 1556
    • england

    #2
    Re: Panasonic tx-p42s31b

    Pics
    Attached Files

    Comment

    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia

      #3
      Re: Panasonic tx-p42s31b

      to get an idea of where to start , an accurate count of the sos blinks would be helpful. they do pause and repeat so you should be able to figure it out. I'm expecting 6 or 7 indicating SN board as that is a more common one. Also, with the mounting screws on that SN board especially where the earth points are, are they all the same type or look like they've been replaced?

      look for shorted transistors on the SN board especially the surface mounted.

      Comment

      • newtothis
        Badcaps Legend
        • Mar 2013
        • 1556
        • england

        #4
        Re: Panasonic tx-p42s31b

        Ok so disconnected SS and still get the green LED blink with same pattern, Disconnecting SN results in the green LED flashing around 20 times then 7 RED blinks

        Comment

        • newtothis
          Badcaps Legend
          • Mar 2013
          • 1556
          • england

          #5
          Re: Panasonic tx-p42s31b

          Hmm actually disonnecting the SN causes 7 RED blinks, So I am i right in assuming it is OK?

          Pointing towards A board do you think?
          Last edited by newtothis; 02-03-2015, 03:00 PM.

          Comment

          • newtothis
            Badcaps Legend
            • Mar 2013
            • 1556
            • england

            #6
            Re: Panasonic tx-p42s31b

            Oh screws have certainly been replaced

            Comment

            • newtothis
              Badcaps Legend
              • Mar 2013
              • 1556
              • england

              #7
              Re: Panasonic tx-p42s31b

              Oh wow! Let me get a pic of this!

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Panasonic tx-p42s31b

                Probably shorted SN. Do you have Vsus? It will cause flashing green then dead or lit LED.
                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

                • newtothis
                  Badcaps Legend
                  • Mar 2013
                  • 1556
                  • england

                  #9
                  Re: Panasonic tx-p42s31b

                  I don't know how the hell I didn't spot this straight off! The history of the TV was that it went to a TV repair shop with a 7 RED blink and came back with a 5 green blink and a quote of £90 to repair it.

                  That damage is certainly done by somebody and not a failure! I will test the transistors and if they are fine I will retrack the board and see what it does.

                  Comment

                  • newtothis
                    Badcaps Legend
                    • Mar 2013
                    • 1556
                    • england

                    #10
                    Re: Panasonic tx-p42s31b

                    Forgot to add pic
                    Attached Files

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia

                      #11
                      Re: Panasonic tx-p42s31b

                      Originally posted by newtothis
                      Forgot to add pic
                      Yeah that's funny. Obviously they've tried to remove the short on the SN board and who knows what but would have to wonder if a professional shop would do that. I would ignore the 5 blinks and focus on getting a new board or a kit to repair it.

                      I did a board for a 50S30 and only 4 x 30f131 were required but it's not always that simple. search the board number and see what's in the kits for an idea.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Panasonic tx-p42s31b

                        I recall 5 blinks occuring on these if the 15V is short/low which could happen if gate driver IC is shorted...
                        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

                        • newtothis
                          Badcaps Legend
                          • Mar 2013
                          • 1556
                          • england

                          #13
                          Re: Panasonic tx-p42s31b

                          I lose the 7 blinks when removing the SN board. Obviously cannot tell if the 5 blinks is a false read or not as the board is buggered.

                          Yeah definitely going with a kit for repair as these boards are going for around £150

                          Comment

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

                            #14
                            Re: Panasonic tx-p42s31b

                            Be aware, The Kits dont always contain everything to repair these boards....

                            NOT repairing properly and getting all the faults first time around, and ALL the new parts as well as probably more will be destroyed. You'll need to replace ALL the tiny driver devices on ALL the dead IGBTS, as well as some of the undamaged IGBT's particularly around the ERC circuit.

                            Even though a good replacement is £150 and repairs to the board are £80, you may find this a better option, as then at least you'll know you have a good base to work on.
                            These are NOT easy fixer-uppers, They are a CRAP design as they run WAY too hot and have a very limited lifespan. The picture when working on the ones Ive done is pretty disappointing too!
                            Last edited by Alastair E; 02-03-2015, 03:47 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

                            • newtothis
                              Badcaps Legend
                              • Mar 2013
                              • 1556
                              • england

                              #15
                              Re: Panasonic tx-p42s31b

                              Most of the IGBT's are reading as closed with only 2 reading as open.

                              Set isn't worth the repair

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: Panasonic tx-p42s31b

                                Seriously? It cost me about £20 to fix a U30B, which is practically the same minus Smart features.

                                PM me, I'll pick up the set off you if you're gonna trash 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

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

                                  #17
                                  Re: Panasonic tx-p42s31b

                                  IF most are short, then maybe someone's been in there--thought it a quicky and replaced a few they found short--Then killed 'em all because they didnt do it right!

                                  Ive had one of those, Took a fair bit of messing round to cure it. I think in the end I replaced all the TO220 SM devices and nearly all the driver devices and a 5V reg too...

                                  Either get a new board, Have yours repaired or part it out, if you are not confident doing it as it'll end up costing you more in time and effort let alone money.....
                                  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

                                  • newtothis
                                    Badcaps Legend
                                    • Mar 2013
                                    • 1556
                                    • england

                                    #18
                                    Re: Panasonic tx-p42s31b

                                    Yeah I will part it out

                                    Getting a new board definitely is not worth it, Can get a working set for £200

                                    Comment

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

                                      #19
                                      Re: Panasonic tx-p42s31b

                                      Flog it to Tom, He's a masochist, enjoys the challenge!
                                      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

                                      • newtothis
                                        Badcaps Legend
                                        • Mar 2013
                                        • 1556
                                        • england

                                        #20
                                        Re: Panasonic tx-p42s31b

                                        Decided to repair the SN board on this.... Replaced all IGBT, drivers etc... No shorts left on board at connector, All buffer IC's show no short.

                                        So install the board and plug it in... Relay clicks... SN green LED lights up Sweet...... CLICK!.... Set shuts down LED goes off on SN... Check SN... Shorted.

                                        I changed EVERY IGBT, Diode etc etc so no fault on my part. Fracture of the panel cause SN to short like this?

                                        Comment

                                        Related Topics

                                        Collapse

                                        • jm1234
                                          Panasonic plasma TX-P42ST50 - 6 blinks
                                          by jm1234
                                          Hi,
                                          anyone able to provide the service manual for old plasma Panasonic TX-P42ST50E?
                                          It turns off almost immediately (0~5 seconds after pressing the on/off button) and starts flashing the red diode 6 times.
                                          I disconnected the left-hand side board (SC?, both the ribbon cable and the power cable to it) and also another ribbon going to bottom left board. Then the led signal is 8 flashes. According to service guide to another Panasonic plasma it would mean the left-hand side board is faulty. But I'm not sure it 100% applies to my model.
                                          I checked that board for any obvious faults...
                                          05-22-2024, 06:59 AM
                                        • Alicat
                                          Panasonic Plasma TH-50PZ85U No screen No blinks on red power light
                                          by Alicat
                                          Hello,

                                          Stopped by this site trying to fix my parents Panasonic Plasma TV.

                                          Model number is TH-50PZ85U

                                          Power comes on and the red power light stays on solid.

                                          Did a few checks like hold the power button on for 60 seconds, hold the - Volume while holding the menu button, no luck, still@ blank grey screen as the screen lights up very vague.

                                          I also hear a few clicks.

                                          I also think my parents said there was a thunderstorm and the TV failed after that.

                                          Section 6 in the service manual talks about power and no screen,...
                                          10-30-2024, 10:09 AM
                                        • nick31
                                          Panasonic Plasma ST50 TC-P55ST50 P55ST50 8 blinks
                                          by nick31
                                          Hello,
                                          My Oct 2012 panny plasma quit working yesterday.
                                          It was on when it happened. It let out a bit of burned plastic/circuit board smell. I was not able to find any burned parts though.
                                          Now it produces 8 blinks. According to the repair manual, that points to SS/SS2 board(s).
                                          I completed the steps in the guide: unplugged SS33, the TV turned on with a black screen, no blinking codes. Then I checked the continuity between pins 1 and 2 of the connectors SS52, SS54-SS57. The continuity is ok in all of them. Guide suggests to replace SS/SS2 boards so I placed an order...
                                          04-21-2021, 09:56 AM
                                        • stecos
                                          Panasonic Plasma main board repair (ST30 GT30 VT30 ST50 GT50 VT50),LED with 3 blincks
                                          by stecos
                                          Hi everyone!
                                          I happened several times, in the search for help from the web, to consult this very interesting forum.
                                          So I decided to sign up and I intend to participate actively by making available my knowledge and experience on the subject, I'm a new user but at the same time I'm old in the sense that I have 4 decades of experience in repairing and designing electronics but above all I'm a great passionate about the subject.

                                          Having said that I come to the gist of my post on the forum as the title suggests.
                                          For my passion for technology I'm now collecting several...
                                          11-28-2022, 11:39 AM
                                        • Biruslapio
                                          Panasonic P50VT20B Plasma 12 Blinks, Power Supply or A-Board?
                                          by Biruslapio
                                          Hello, I've had this TV for 3 years, 2 years ago it stopped working signaling 12 Blinks, SOUND_SOS according to the service manual.

                                          It has no VSUS or VDAT, and P15V has 1.0V instead, the same 15V goes to A board. F15V is ok and other main voltage rails.

                                          It seems the power supply is defective, since unplugging D20 ribbon cable that goes from D-board to SC-board makes the behavior change, the TV stays on, there's no image nor VSUS, but 15V reads 2.4V, high enough to not trip the SOS 12 blinks, so it stays on, fans do not spin but I left it 2 hours, green led lit up...
                                          02-16-2021, 09:44 PM
                                        • Loading...
                                        • No more items.
                                        Working...