Panasonic TCP-42S2 6blink

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  • bikerbuddy
    Senior Member
    • Jun 2011
    • 134
    • USA

    #1

    Panasonic TCP-42S2 6blink

    Appreciate some help with this SC board, Originally started out with 10 blinks and I narrow it down to the SC board found a few bad fets order the set from China and replaced all the fets and diodes since they were under a buck each also replaces the two fet drivers IC 521 and IC 501 M81737FP.
    Put every thing back together ,power it up now I got 6 blink, pulled the Sc out back and start checking each component and found one dead resistor and diode , I replaced the diode and the resistor with a standard 1/4 watt resistor closed to the same value .

    Hook every thing up and try to start the tv up still got 6 blink , after further testing I found a set of small grey capacitor ,C 645, C646, C661 and C662 ( they are rated 630v 1000P) that are dead ,cannot get any reading ,no ohms or diode reading from them , but there is one cap that is similar to the dead one that I do get a reading out of C641, 630V 2200P. This cap reads like a diode ,reading in one direction , could those caps without a reading be dead?.
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Panasonic TCP-42S2 6blink

    A good capacitor will test open on a meter.

    There should be an LED on the SC board. Does it glow, then go out, or is it always off?

    I had a TC-P42U30B on my bench. Installed a load of parts and fired it up and it flashed the screen briefly but then did a 6 blink error. No blown parts. Found my soldering for one of the gate drivers wasn't perfect. Touched that up and it fired up perfect. On mine, the ERC LED (on SC board) lit briefly, then went out as soon as the flash appeared.
    Last edited by tom66; 12-10-2014, 02:52 PM.
    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

    • bikerbuddy
      Senior Member
      • Jun 2011
      • 134
      • USA

      #3
      Re: Panasonic TCP-42S2 6blink

      The led is always off .

      Comment

      • bikerbuddy
        Senior Member
        • Jun 2011
        • 134
        • USA

        #4
        Re: Panasonic TCP-42S2 6blink

        So then the one cap that i got a reading from would u say it is bad , as I mention it is reading like when u test a diode

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia

          #5
          Re: Panasonic TCP-42S2 6blink

          A 5105 repair should be similar to a 5081 and 5066 Sc board repair. I'd get away from thinking caps.you can search tnpa5081 for some ideas

          I'm thinking on these we're looking at RJP63F3A,RJP43F4A,RJP56F4A,30F125, not sure if these have 45G128 for the IGBTs used, not sure. list what you have replaced pleas + the part number
          Attached Files
          Last edited by tw2005; 12-10-2014, 03:33 PM.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Panasonic TCP-42S2 6blink

            If the LED never lights up

            - The precharge circuit for the blue poly ERC caps is bad (a few resistors in series to Vsus)
            - There is a short on the ERC side to ground
            - The ERC LED can be open (tw has encountered this on other boards I believe)

            Now, I had a look at the schematic and I think this TV does not use a precharge circuit (which is different to the G10s and U30s, so it's odd that Panasonic has done this.) So the problem is likely 2 or 3.

            Precharge is used to reduce stress on the SUS IGBTs on turn on, otherwise the ERC circuit takes about ~1sec before becoming active without it, during which time the IGBTs are driving into a large capacitance and dissipating a lot of 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

            • bikerbuddy
              Senior Member
              • Jun 2011
              • 134
              • USA

              #7
              Re: Panasonic TCP-42S2 6blink

              Tom I made a mistake about the light , I just put board back on the tv and fired it up and I did saw the light on the Sc and the SS board lit for a few seconds while the tv went into the 6 blink .

              For Tw2005 I have replaced DG 502L, F50Al, RF2001, RJP3034, RFUS20, RJK6026, RJP63F3A, 45G128, RJP43F4A and 2 IC M81737FP and 45G128
              Last edited by bikerbuddy; 12-10-2014, 04:19 PM.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Panasonic TCP-42S2 6blink

                Ok, looking at the lights, do SC/SS disappear at about the same time, or does SC go out/dim first?
                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

                • bikerbuddy
                  Senior Member
                  • Jun 2011
                  • 134
                  • USA

                  #9
                  Re: Panasonic TCP-42S2 6blink

                  Both light goes out the same time dim out
                  Last edited by bikerbuddy; 12-10-2014, 05:22 PM.

                  Comment

                  • bikerbuddy
                    Senior Member
                    • Jun 2011
                    • 134
                    • USA

                    #10
                    Re: Panasonic TCP-42S2 6blink

                    Also I noticed that on power on the screen come on for about 2-3 seconds and goes to 6 blink

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Panasonic TCP-42S2 6blink

                      Nothing shorting then, I'd check soldering around transsitors. Did you replace any of the gate driver chips (small surface mount devices)?
                      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

                      • bikerbuddy
                        Senior Member
                        • Jun 2011
                        • 134
                        • USA

                        #12
                        Re: Panasonic TCP-42S2 6blink

                        No I did not, I will pull the board back out and recheck all the solder joints and post back in the morning .Thanks you and TW2005 for your help.
                        Last edited by bikerbuddy; 12-10-2014, 05:32 PM.

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia

                          #13
                          Re: Panasonic TCP-42S2 6blink

                          Originally posted by bikerbuddy
                          No I did not, I will pull the board back out and recheck all the solder joints and post back in the morning .Thanks you and TW2005 for your help.
                          Check D451 for short cct, SMD sits next to Q451. If TOM means the driver ICs, you replaced them , IC 521 and IC 501 M81737FP.
                          Last edited by tw2005; 12-11-2014, 01:56 AM.

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Panasonic TCP-42S2 6blink

                            Worth checking the smd resistors for the IGBT gates 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

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6458
                              • Australia

                              #15
                              Re: Panasonic TCP-42S2 6blink

                              Here's a little feedback on a 5105 board. missed D451 (shorted) caused first failed repair attempt. mentions 7 blink

                              https://www.badcaps.net/forum/showthread.php?t=39312

                              I know from experience shorted D451 on a 5081 will cause the screen to very briefly energise and 6 blink. The cct design there is the same

                              Comment

                              • tw2005
                                Badcaps Legend
                                • Oct 2011
                                • 6458
                                • Australia

                                #16
                                Re: Panasonic TCP-42S2 6blink

                                Originally posted by bikerbuddy
                                found one dead resistor and diode , I replaced the diode and the resistor with a standard 1/4 watt resistor closed to the same value .
                                where were these and how close in value?

                                Comment

                                • bikerbuddy
                                  Senior Member
                                  • Jun 2011
                                  • 134
                                  • USA

                                  #17
                                  Re: Panasonic TCP-42S2 6blink

                                  Ok Guys I pulled the Sc board and recheck all the solder joints , I also check all the fets and diodes and found D451 45G128 shorted ,Q401 DG502LW shorted and one Small inverter 5 leg chip Q551, which I borrowed from a scientific Atlanta cable box and it works .

                                  The resistor I replaced is R451= 5.6k replacement is 5.64k .To summerise ,I placed the SC board back on the tv hook all the cables up ,power on and got 6 blink ,waited 5 minutes and I removed the SC20 cable and the tv stay on , Green light on SC & SS board.Time to look into the A board would u say .

                                  Comment

                                  • bikerbuddy
                                    Senior Member
                                    • Jun 2011
                                    • 134
                                    • USA

                                    #18
                                    Re: Panasonic TCP-42S2 6blink

                                    Pic shows where parts replaced and their value.
                                    Attached Files
                                    Last edited by bikerbuddy; 12-12-2014, 04:04 PM.

                                    Comment

                                    • tw2005
                                      Badcaps Legend
                                      • Oct 2011
                                      • 6458
                                      • Australia

                                      #19
                                      Re: Panasonic TCP-42S2 6blink

                                      So possibility D451 was originally shorted? the 45G128 is that shorted in or out of cct?

                                      Q551 which you borrowed, what markings are on that? It's not an inverter chip but a PNP / NPN high current switching

                                      Is everything else ok like Q661

                                      Comment

                                      • bikerbuddy
                                        Senior Member
                                        • Jun 2011
                                        • 134
                                        • USA

                                        #20
                                        Re: Panasonic TCP-42S2 6blink

                                        Pic where resistor and cap were replaced
                                        Attached Files

                                        Comment

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