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Panasonic TC-P50S60 Plasma 7 Blinks

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    Panasonic TC-P50S60 Plasma 7 Blinks

    I got this TV from someone who said it would not turn on, and had the 7 blink code. When I brought it home, it turned on and worked with no problems. I tested it for a while OK, and gave it to a friend.

    A few days later the TV started the 7 blink code again. All signs pointed to the SC board. I replaced the board and the TV worked again. But it was still intermittent for a while, and now won't come on at all again.

    I did the process of bypassing SD and SU, same 7 blinks. I have the normal 5V and 15V voltage on the SC that are part of the voltage check on startup..

    The Vsus is where the problem seems to be. With the SC disconnected from the power supply, the Vsus comes up steady to around 208V. With the SC plugged in, it comes up to around 208V but fluctuates rapidly until the 7 blinks start (It only gives it a second or so for the test before shutting down).

    I'm thinking maybe the power board Vsus is breaking down under load.. Any ideas on how I can troubleshoot this?? Thanks!

    EDIT: Last pic, may be hard to see, but board is discolored from heat around Vsus circuit..
    Attached Files
    Last edited by kevinm34232; 06-09-2016, 06:54 PM.

    #2
    Re: Panasonic TC-P50S60 Plasma 7 Blinks

    Seems like SC is shot again and is loading down the Psu. Have you checked the SC for short circuit ?
    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 !

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    Comment


      #3
      Re: Panasonic TC-P50S60 Plasma 7 Blinks

      There is nothing obvious.. the test points in the TM that are checked:

      Vsus to GND = 15.00M
      VFO - VFG = 0L
      F5V - VFG = 55k

      Comment


        #4
        Re: Panasonic TC-P50S60 Plasma 7 Blinks

        I was hoping maybe a bad solder joint on the power board.. What's the likelihood of the SC board being intemittent initially (enough where the previous owner could not get it to work at all anymore), then it works fine for me for a while, then problem repeats.. And then repeats again after replacing SC board?? Does the heat damage on the PS board tell anything?

        Attahced is underside of where board was discolored..
        Attached Files
        Last edited by kevinm34232; 06-09-2016, 08:46 PM.

        Comment


          #5
          Re: Panasonic TC-P50S60 Plasma 7 Blinks

          That really brown inductor leg looks really suspect. I'd cleaning that up desolder and apply fresh solder

          Comment


            #6
            Re: Panasonic TC-P50S60 Plasma 7 Blinks

            7-blink implies floating-supply issue--commonly associated with buffers.

            Remove buffers, link SC50 and re-try. If set runs--buffers are faulty.
            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


              #7
              Re: Panasonic TC-P50S60 Plasma 7 Blinks

              Tried this.. No change when buffers are taken out of equation..

              I reworked the solder joints around the areas of the power board that have over heated, and now I am only getting +-100V for Vsus, so something else has happened..

              Comment


                #8
                Re: Panasonic TC-P50S60 Plasma 7 Blinks

                I am thinking it's the PSS. If the voltages going to the SC are erratic then the SOS circuits are going to trip once they're out of limits

                Comment


                  #9
                  Re: Panasonic TC-P50S60 Plasma 7 Blinks

                  Woww this sucks.. I got a new/used SC and PSS board, same problem 7 blink instant shutdown with or without SU/SD bypass. The only way Vsus voltage will stay up is by removing the SC20 connector to the A board, and it holds about 10-12 seconds before giving 6 blink code..

                  Could this be a main board problem??

                  Comment


                    #10
                    Re: Panasonic TC-P50S60 Plasma 7 Blinks

                    Reading the SM again I see this, exact symptom to what I just posted above... Keeps pointing to SC board.. What's the odds the 3 of these are bad, and intermittent at times before??

                    Also there is no sticker that I can find on the panel (MC127FU6A11), where can I find the proper voltages to test? Not seeing in the SM or TM either..

                    Vsus = 207V
                    VFG = -195V
                    VAD = 200V
                    VFO = 148V
                    Attached Files
                    Last edited by kevinm34232; 06-17-2016, 10:35 PM.

                    Comment


                      #11
                      Re: Panasonic TC-P50S60 Plasma 7 Blinks

                      Originally posted by kevinm34232 View Post
                      Woww this sucks.. I got a new/used SC and PSS board, same problem 7 blink instant shutdown with or without SU/SD bypass. The only way Vsus voltage will stay up is by removing the SC20 connector to the A board, and it holds about 10-12 seconds before giving 6 blink code..

                      Could this be a main board problem??
                      It could but since you disconnected the SC20 and it stayed on for 11 secs and went 6 instead of 7 I think not.

                      2 SC boards both 7 blink with Sc50 jumpered, would think it points to SC but you said the volatages were erratic on Vsus . Is that the case or s it just the meter not refreshing quick enough?

                      Can you find any Transistors shorted on both SC boards?

                      Comment


                        #12
                        Re: Panasonic TC-P50S60 Plasma 7 Blinks

                        Vsus comes up then drops a little then stabilizes around 207V. This is a new/used PSS board too. Can you look at the voltages I just added above and see they look normal? I'm about to try disabling SOS7_SC2, I don't what else to try, unless all these SC boards have same problem... The first one I replaced when I first got it lasted a while, but it was even itermittent before that..

                        Also SOS7_SC2 is 0v without SC20 connected, 1.7V with it connected.

                        Im going to try 1 more SC board that is supposedly from a new TV damaged in shipping.
                        Attached Files
                        Last edited by kevinm34232; 06-17-2016, 11:03 PM.

                        Comment


                          #13
                          Re: Panasonic TC-P50S60 Plasma 7 Blinks

                          Would you believe the mainboard on my washing machine just crapped, Mrs stomping, quick recap and working again.

                          Man can't get a moment to himself.

                          I'll have a read or actually I've got the back off a S30 so I'll grab some voltages.

                          what were you using for ground point? Chassis

                          Comment


                            #14
                            Re: Panasonic TC-P50S60 Plasma 7 Blinks

                            Originally posted by kevinm34232 View Post
                            Vsus comes up then drops a little then stabilizes around 207V. This is a new/used PSS board too. Can you look at the voltages I just added above and see they look normal? I'm about to try disabling SOS7_SC2, I don't what else to try, unless all these SC boards have same problem... The first one I replaced when I first got it lasted a while, but it was even itermittent before that..

                            Also SOS7_SC2 is 0v without SC20 connected, 1.7V with it connected.

                            Im going to try 1 more SC board that is supposedly from a new TV damaged in shipping.
                            I've done something like that and got away with it and on other occasions burnt a PCB and destroy a complet set of Buffer boards so i would hang off on that idea.

                            Also i had a 4782 that I could not clear and earthed out the SOS 7 and it still shtdown. There may be a nother path.

                            Turned out part of the SOS cct was damaged on that but in the end I damaged it , too much tinkering to find the fault.

                            Comment


                              #15
                              Re: Panasonic TC-P50S60 Plasma 7 Blinks

                              Originally posted by kevinm34232 View Post
                              Reading the SM again I see this, exact symptom to what I just posted above... Keeps pointing to SC board.. What's the odds the 3 of these are bad, and intermittent at times before??

                              Also there is no sticker that I can find on the panel (MC127FU6A11), where can I find the proper voltages to test? Not seeing in the SM or TM either..

                              Vsus = 207V
                              VFG = -195V
                              VAD = 200V
                              VFO = 148V
                              So you need to give me the gnd point s for each of these.

                              207V Vsus is not an issue, t's ball park

                              Vfg -195V with respect to what? On the 2011 set to gnd -160V

                              VAD if in respect to Vfg the I get about the same, to gnd 40V ( could be + or minus I forgot to check)

                              Vfo 148V, no idea and I'm not going to tr and find a test point for that one in case I short something out.

                              Comment


                                #16
                                Re: Panasonic TC-P50S60 Plasma 7 Blinks

                                VAD and VFO I believe were floating ground, the rest to chasis ground.

                                Comment


                                  #17
                                  Re: Panasonic TC-P50S60 Plasma 7 Blinks

                                  Originally posted by kevinm34232 View Post
                                  VAD and VFO I believe were floating ground, the rest to chasis ground.
                                  Then I don't see anything, don't think there's a lot of point measuring Vfg to chassis.
                                  Last edited by tw2005; 06-18-2016, 12:40 AM.

                                  Comment


                                    #18
                                    Re: Panasonic TC-P50S60 Plasma 7 Blinks

                                    Originally posted by tw2005 View Post
                                    Would you believe the mainboard on my washing machine just crapped, Mrs stomping, quick recap and working again.

                                    Man can't get a moment to himself.

                                    I'll have a read or actually I've got the back off a S30 so I'll grab some voltages.

                                    what were you using for ground point? Chassis
                                    Did you say you had bad caps on the washer!?

                                    Comment


                                      #19
                                      Re: Panasonic TC-P50S60 Plasma 7 Blinks

                                      So if another SC board does not work, are we just left with the A board at that point? Would removing SU/SD rule out the panel?

                                      Comment


                                        #20
                                        Re: Panasonic TC-P50S60 Plasma 7 Blinks

                                        Originally posted by kevinm34232 View Post
                                        So if another SC board does not work, are we just left with the A board at that point? Would removing SU/SD rule out the panel?
                                        did'nt you say sc50 jumpered it fails too? That's with the SD/Su disconnected yes?

                                        Just going through some other docs, all those volatages appear to be normal.

                                        VAD - Vfg 200V
                                        TPSC1 - Vfg 147V (Vfo)

                                        F20V - Vfg 18.6V
                                        F15V - Vfg 14.6V
                                        F5V - Vfg , 5V
                                        Attached Files

                                        Comment

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