Panasonic TX-P37X20B

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  • delphiplasma
    Member
    • Mar 2016
    • 23
    • UK

    #1

    Panasonic TX-P37X20B

    Hi,

    I have an issue with this plasma TV. When switched on from 'cold' the first 2 minutes of the image is obscured by vertical wide red and blue columns, as can be seen from the attached photo. This is the same for all inputs.
    Can someone please advise which board is causing the issue.
    Your help would be greatly appreciated.
    Thanks in advance.
    Delphi
    Attached Files
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: Panasonic TX-P37X20B

    There's a service manual in the following thread
    https://www.badcaps.net/forum/showth...ght=TX-P37X20B

    How to run the self test on a plasma display control board / logic board
    https://www.badcaps.net/forum/showthread.php?p=534846
    Last edited by dick_barton; 06-25-2016, 04:07 PM.
    Willing to help but I'm no expert.

    Comment

    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6457
      • Australia

      #3
      Re: Panasonic TX-P37X20B

      Originally posted by delphiplasma
      Hi,

      I have an issue with this plasma TV. When switched on from 'cold' the first 2 minutes of the image is obscured by vertical wide red and blue columns, as can be seen from the attached photo. This is the same for all inputs.
      Can someone please advise which board is causing the issue.
      Your help would be greatly appreciated.
      Thanks in advance.
      Delphi
      A-board, one of the BGA chips has broken solders highly likely. Trying warming that board with a hair dryer before you turn it on and the problem may not be there on startup but either you'd have t replace the board or find someone who do do BGA work.
      Last edited by tw2005; 06-25-2016, 04:28 PM.

      Comment

      • ReeceyBurger123
        Never Give Up !
        • May 2014
        • 7325
        • Britain

        #4
        Re: Panasonic TX-P37X20B

        Originally posted by tw2005
        a-board, one of the bga chips has broken solders highly likely. Trying warming that board with a hair dryer before you turn it on and the problem may not be there on startup but either you'd have t replace the board or find someone who do do bga work.
        +1
        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

        https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • delphiplasma
          Member
          • Mar 2016
          • 23
          • UK

          #5
          Re: Panasonic TX-P37X20B

          Thanks for your help. I was hoping it wasn't the A board, as they are impossible to find. I'll do the confirmation tests as suggested and let you know the results.
          Once again, thanks for the quick responses.

          Comment

          • ozzy214
            Badcaps Veteran
            • Nov 2013
            • 319
            • usa

            #6
            Re: Panasonic TX-P37X20B

            You can always try the "oven trick" if the board is impossible to find. Fixed quite a few dv2000 and dv6000 back in the day with no ill effects. Most customers got another year or two out of the machine with zero failure.

            I believe its 375 or 380 in the oven. Set the board on a glass bowl safe for oven use to keep it off the rack. 10 mins cook time and let cool.

            Look on google for correct temp. I recommend this if all else fails and what do you have to lose? TV is already broke!

            Comment

            • delphiplasma
              Member
              • Mar 2016
              • 23
              • UK

              #7
              Re: Panasonic TX-P37X20B

              Thanks for the tip. The TV is fine after 2minutes. I'll first confirm issue with hairdryer and then remove the board and clean it up, maybe run solder iron over it. Oven idea is very interesting.

              Comment

              • delphiplasma
                Member
                • Mar 2016
                • 23
                • UK

                #8
                Re: Panasonic TX-P37X20B

                Okay...So I managed to get a replacement board off E-bay. I put it in last night powered up and it looked like the bars had gone. However, it only stayed powered on for 3 seconds after which it went into standby with the red light flashing a sequence of 4 flashes. Tried powering back on...Green light flashing quickly, then back to the red light sequence. I dropped the old board in and the same thing is happening! Arggggg!!

                Comment

                • tw2005
                  Badcaps Legend
                  • Oct 2011
                  • 6457
                  • Australia

                  #9
                  Re: Panasonic TX-P37X20B

                  Originally posted by delphiplasma
                  Okay...So I managed to get a replacement board off E-bay. I put it in last night powered up and it looked like the bars had gone. However, it only stayed powered on for 3 seconds after which it went into standby with the red light flashing a sequence of 4 flashes. Tried powering back on...Green light flashing quickly, then back to the red light sequence. I dropped the old board in and the same thing is happening! Arggggg!!
                  Check the SS board RJP30E4. Also check SN board especially the recovery cct where the SS connects to.

                  Vsus most likely shorted.

                  I'd replace the M81735P driver on the SS too for good measure if those IGBTs are shorted

                  Comment

                  • delphiplasma
                    Member
                    • Mar 2016
                    • 23
                    • UK

                    #10
                    Re: Panasonic TX-P37X20B

                    Thanks. I wonder if the board I purchased off eBay was actually the cause of the death of the other components or those other components were already on their way out?

                    Comment

                    • delphiplasma
                      Member
                      • Mar 2016
                      • 23
                      • UK

                      #11
                      Re: Panasonic TX-P37X20B

                      Just a quick query, I gather the 4 blink code, which relates to power supply board issue is being caused by the short circuit on the other boards? I suppose if disconnecting those boards, if the led blink remains 4 blinks then it would be a P board issue.

                      Comment

                      • delphiplasma
                        Member
                        • Mar 2016
                        • 23
                        • UK

                        #12
                        Re: Panasonic TX-P37X20B

                        Okay...so I disconnected the right side board and still flashing 4sos. However, after reconnecting right side board and disconnecting left side board I get 2sos. So does this mean that the left side board is duff together with the A board? Thanks

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6457
                          • Australia

                          #13
                          Re: Panasonic TX-P37X20B

                          Originally posted by delphiplasma
                          Okay...so I disconnected the right side board and still flashing 4sos. However, after reconnecting right side board and disconnecting left side board I get 2sos. So does this mean that the left side board is duff together with the A board? Thanks
                          No idea. Disconnect P2,P11,P35, the 3 white ribbons at the A-board, turn it on and see if it passes.

                          Turn it off and don't reconnect P35,P2,P11 for a good 5-10 mins for the residual voltage to drop as a spike especially P35 can damage the panel.

                          Comment

                          • delphiplasma
                            Member
                            • Mar 2016
                            • 23
                            • UK

                            #14
                            Re: Panasonic TX-P37X20B

                            Okay...I disconnected the 3 ribbons to the A board and still get 4 flashes. I checked the resistance of the SC and SS main voltage input terminals and can confirm there are no short circuits. Maybe the supply to the A board has been affected? 15v or 5v??

                            Comment

                            • delphiplasma
                              Member
                              • Mar 2016
                              • 23
                              • UK

                              #15
                              Re: Panasonic TX-P37X20B

                              Sorry, I didn't disconnect the P cables. It passed the test and remained a stable green light.

                              Comment

                              • delphiplasma
                                Member
                                • Mar 2016
                                • 23
                                • UK

                                #16
                                Re: Panasonic TX-P37X20B

                                I have just read the link dick Barton included in the second post. I'll check the resistance at the connectors on the SS and SC board. Altough initial measurements suggest no problems? Maybe the power board is at fault?

                                Comment

                                • tw2005
                                  Badcaps Legend
                                  • Oct 2011
                                  • 6457
                                  • Australia

                                  #17
                                  Re: Panasonic TX-P37X20B

                                  Originally posted by delphiplasma
                                  Sorry, I didn't disconnect the P cables. It passed the test and remained a stable green light.
                                  That would mean either sn or ss. May not be dead short but low enough to trip 4 blink and it would not take much to check for shorted transistors on either board

                                  Comment

                                  • delphiplasma
                                    Member
                                    • Mar 2016
                                    • 23
                                    • UK

                                    #18
                                    Re: Panasonic TX-P37X20B

                                    What does P35 supply? Can I connect P35 and power up to see if it still passes the green light test, which would definitely condemn the SN/SS boards? Unless, P35 is an auxiliary supply for the SN/SS boards? I'll do some more measurements, but am thinking more likely to be the SN board. Will get back with my results, when I get the time.

                                    Thanks for the invaluable help so far. It's a shame it had to come to this, when the original problem I could have lived with.

                                    Comment

                                    • tw2005
                                      Badcaps Legend
                                      • Oct 2011
                                      • 6457
                                      • Australia

                                      #19
                                      Re: Panasonic TX-P37X20B

                                      p35 powers the panel through the c boards and ribbons. You probably could do that but be warned if you disconnect or reconnect whilst there is any residual power(stored in the caps) and spike , good chance the panel can be damaged.

                                      Highly unlikely that is your 4 blink. You could hook it all up and disconnect p2 and if it went 7 blink then the 4 blink was the SN board, if still 4 blink then disconnect p11, reconnect p2 and see what happens there

                                      Comment

                                      • delphiplasma
                                        Member
                                        • Mar 2016
                                        • 23
                                        • UK

                                        #20
                                        Re: Panasonic TX-P37X20B

                                        Thanks. I've been doing some resistance checks on the semiconductor devices, such as the RJP30E's on the SS board and D461, D725 and Q441 on the SC board. When we talk about 'shorts' are they straight 0ohms, or is 0.17ohms - 17ohms okay? I'm testing the devices in circuit. Thanks for the P35 explanation. I will try the P2/P11.
                                        nd

                                        Comment

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