Panasonic plasma TC-P42S30. What is killing my SN boards?

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  • mattpd
    Badcaps Veteran
    • Oct 2012
    • 301
    • USA
    #1

    Panasonic plasma TC-P42S30. What is killing my SN boards?

    I have a Panasonic plasma TC-P42S30 that I bought with 14 blinking lights. I know 14 is not listed in the service manual but I assure you it's 14. I bought a new SN board and installed it. It worked for a few minutes but with a few black lines across the screen. I wiggled one of the tab connectors and the TV shut off. I thought maybe this was my fault, so I ordered a new SN board. The TV came on again with the new board, but it still had a few black lines. This time I didn't touch ANYTHING, yet the TV still turned off after 30 seconds and has 14 blinks again.

    I'm digging myself a hole with TV. Help me get out please! The only connections to the SN board are the tabs to the panel, one ribbon cable to the main board, and the power cord that goes to psu. I assume the psu is doing something crazy.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

      14 blinks is an odd error but is explained in a training manual
      http://tgohome.com/ServiceManuals/Pa...nd_extra_info_[TM].pdf

      (slide 56.)

      It is NOT an SN/SS board error (those can only be 4, 6, 7 or 8 blinks.) It is an audio PWM error, possibly bad audio amplifier or shorted output.
      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

        • mattpd
          Badcaps Veteran
          • Oct 2012
          • 301
          • USA
          #3
          Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

          Strange. Audio works great as long as TV is on. And the only way the TV will come on is to put a new SN board in (this is my third one). The board had no short when I put it in, now it has a short. It is in these components and possible somewhere else too.

          Also, I read on another website (I think justanswers, I will try to dig it up) about a guy that had 14 blinks, and his problem was sorted out with a new SN board. Unfortunately it only sorts my problem out for less than a minute.
          Attached Files
          Last edited by mattpd; 11-09-2012, 10:46 AM.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

              It might be 15V too high causing the problem.
              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

                • mattpd
                  Badcaps Veteran
                  • Oct 2012
                  • 301
                  • USA
                  #5
                  Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                  So I can find any place on the power board labeled "+15vc" and test there?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                      On the connector from SN to SS there is a 15V supply along same cable as Vs (200V.) The PSU also provides 15V standby power.
                      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

                        • mattpd
                          Badcaps Veteran
                          • Oct 2012
                          • 301
                          • USA
                          #7
                          Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                          There is no connection from SS to SN. SN only has a ribbon to the A board, and the VSUS connection to the PSU, and the tabs to the panel. I did check the 15v going to the SS board and it is within spec. Also checked the VSUS going to SN and it is 200ish.
                          Attached Files

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                              Oh, OK, this is a different design, it goes through P board, so check the voltage on the pins on the P 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

                                • mattpd
                                  Badcaps Veteran
                                  • Oct 2012
                                  • 301
                                  • USA
                                  #9
                                  Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                  With the SN board plugged in the VSUS never shows voltage and neither does the 15v. With the SN board unplugged from PSU the TV gives 206v briefly before it shuts itself off and the 15v gives 15.6 very briefly.

                                  When SN is unplugged TV comes on for a second with sound, and then turns off with 8 blinks. SN plugged in and I get no sound and 14 blinks.
                                  Last edited by mattpd; 11-09-2012, 11:47 AM.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK
                                      #10
                                      Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                      8 blinks is SS error. Maybe a bad SS is killing SN. tw2007 and rayrod know a lot more than me about Panasonic plasmas.
                                      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

                                        • mattpd
                                          Badcaps Veteran
                                          • Oct 2012
                                          • 301
                                          • USA
                                          #11
                                          Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                          Too bad you are the only one willing to help... Thank you though. I may look into getting a new SS

                                            Comment

                                            • tom66
                                              EVs Rule
                                              • Apr 2011
                                              • 32560
                                              • UK
                                              #12
                                              Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                              Originally posted by mattpd
                                              Too bad you are the only one willing to help... Thank you though. I may look into getting a new SS
                                              They might be busy. I need to do my maths homework, too.
                                              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

                                                • mattpd
                                                  Badcaps Veteran
                                                  • Oct 2012
                                                  • 301
                                                  • USA
                                                  #13
                                                  Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                  K, have fun!

                                                  Just a few more pieces of info. With the SS board unhooked and SN hooked up I get 14 blinks again. I guess it check SN before SS? If I unhook BOTH boards at the same time, the TV seems to operate normally (of course I have no picture or sound) but I don't get blinks, and the TV turns off and on with each press of the power button which it would not do before.

                                                  EDIT: With both boards out it operates normally, with no blink, as long as I don't leave it for more than a minute. After about a minute it shuts off and gives 6 blinks... Before it would read 215v VSUS for only a second, now it reads 215v for the full minute until it shuts off. Within this minute window I can power on and off normally.
                                                  Last edited by mattpd; 11-09-2012, 12:34 PM.

                                                    Comment

                                                    • mattpd
                                                      Badcaps Veteran
                                                      • Oct 2012
                                                      • 301
                                                      • USA
                                                      #14
                                                      Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                      I just took a second look at the service manual and at the troubleshooting flow chart. It turns out there is a status LED on both the SS and SN board... It says to check both boards for the LED and if not lit replace both boards... I should have paid more attention the first time around... I have never seen the LED light up on the SS and it lights up on the SN the first time I hook it up, but only until SN shorts out...

                                                      I am pretty confident that replacing both boards at the same time should fix it (fingers crossed).

                                                        Comment

                                                        • mattpd
                                                          Badcaps Veteran
                                                          • Oct 2012
                                                          • 301
                                                          • USA
                                                          #15
                                                          Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                          Got the tv working. It was a bad SS board that caused the SN boards to fail.

                                                            Comment

                                                            • BL4CKWAT3R
                                                              New Member
                                                              • Aug 2013
                                                              • 2
                                                              • United States
                                                              #16
                                                              Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                              So when you found out that the TV give you a status on the SN & SS Boards by lighting up if they're functioning properly, did you hold down the power button to see it give you said status via LED lights on the SS & SN Boards? My tv is having a similar issue. Power led blinks 14 times and the tv doesn't have sound or visual. SO far i haven't notice any LED's light up on the SS & SN Boards. Can you possibly help me out?

                                                                Comment

                                                                • tw2005
                                                                  Badcaps Legend
                                                                  • Oct 2011
                                                                  • 6457
                                                                  • Australia
                                                                  #17
                                                                  Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                                  Originally posted by BL4CKWAT3R
                                                                  So when you found out that the TV give you a status on the SN & SS Boards by lighting up if they're functioning properly, did you hold down the power button to see it give you said status via LED lights on the SS & SN Boards? My tv is having a similar issue. Power led blinks 14 times and the tv doesn't have sound or visual. SO far i haven't notice any LED's light up on the SS & SN Boards. Can you possibly help me out?
                                                                  Check for dead short on the Vsus line at the SS and SC boards.

                                                                    Comment

                                                                    • BL4CKWAT3R
                                                                      New Member
                                                                      • Aug 2013
                                                                      • 2
                                                                      • United States
                                                                      #18
                                                                      Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                                      And how do you check for a dead short on the Vsus line? I tried educating myself and learning what the boards and parts on the back look like and their names but all i know is what the SS,SN, and main board looks like.

                                                                        Comment

                                                                        • fasllc
                                                                          New Member
                                                                          • Jan 2015
                                                                          • 1
                                                                          • United States
                                                                          #19
                                                                          Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                                          Hello group. I just got a TC-P42S30 from craigslist, with no a/v. The PO said initially, the TV had 14 blinks. He sent in a board to be repaired. When he reinstalled the repaired board, he said the TV worked fine. Then the TV went out again and had 7 blinks this time.

                                                                          The PO stated he spent $50 and he was done. The TV was free. I got it for my older sister, who has been down on her luck for awhile now. She is still watching a 19" tube set at this time and I REALLY want to fix this TV and surprise her with it. My issue is I don't have alot of cash to be buying parts, the majority being used and I am concerned the used parts will go bad in no time, as did the original parts.

                                                                          I can buy her a LCD 'Dynex' TV for $210 shipped, but to be honest, that is more than I want to spend. I don't mind spending $100 to fix this TV, just don't want to fix it and 3 days later get a phone call. At least the new one has a warranty, but the Panny is a better set I'd imagine. The bonus is this Panny is a smart TV (I guess, I haven't seen it in operation...yet!)?

                                                                          SO, I guess I am looking for advice. What would you do? Repair this sweet plasma or get a lesser quality LCD? Thanks in advance for any assistance...

                                                                            Comment

                                                                            • slidewire
                                                                              Member
                                                                              • Feb 2011
                                                                              • 10
                                                                              #20
                                                                              Re: Panasonic plasma TC-P42S30. What is killing my SN boards?

                                                                              My experience has been, with Panasonic models manufactured after 2010, it doesn't always matter what the error code is, the problem is likely a shorted SC or SN board.

                                                                                Comment

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