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[REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

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    [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

    Hello everyone, I've had this for more than 20 years so it's quite sentimental. It was stored for a couple of years in storage and then we moved to another location and as you can see in the videos this was the surprise. I'm still trying to gather information and watch alot of videos to be as ready as
    I can before opening the back as I am aware there are alot of hazardous areas back inside. BTW I've got the service manual.

    The Problem :

    TV is flickering and colours are not aligned (convergence issue ? ), not all input channels (composite/RCA) act the same and the Component Input acts differently I think. The video will speak a thousand words I'm sure.

    Videos from each input channel

    1- AV1 (Composite cable from a PS1 ):
    https://www.youtube.com/watch?v=6lfxpImx8yE
    2- AV2 (Composite cable from a PS1 ):
    https://www.youtube.com/watch?v=LHWeE9C8_nE
    3- AV3 (Composite cable from a PS1 ):
    https://www.youtube.com/watch?v=x0LMW_M6MHc
    4- DVD (Component cable from a OG Xbox ):
    https://www.youtube.com/watch?v=FgS4MNPdFKM


    TV Model : Panasonic Quintrix F TC-21P50R

    I would really appreciate if any one would help me in sharing his/her thoughts on what are problems I'm having and where and how to fix them that would be really appreciated.

    Background : I'm always looking to learn new things and in my free time I like to buy and fix broken stuff which is quite therapeutic.
    Attached Files
    Last edited by sultanpepper; 05-15-2022, 12:39 PM.

    #2
    Re: [REPAIR] Help in diagnosing my Old CRT TV

    Chroma system PAL60 , NTSC ?

    Comment


      #3
      Re: [REPAIR] Help in diagnosing my Old CRT TV

      Originally posted by kasfamily View Post
      Chroma system PAL60 , NTSC ?
      AFAIK It supports PAL60 and in picture settings there ( PAL, SECAM, NTSC4.43, NTSC3.58 & AUTO).

      Where I live PAL was the standard format and our mains voltage is 220V 50 Hz.

      Please let me know if you need more information

      BR

      Comment


        #4
        Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

        please help

        Comment


          #5
          Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

          Does your TV have a scart input

          Comment


            #6
            Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

            Does the PS have an rf module included ?
            Attached Files

            Comment


              #7
              Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

              Originally posted by kasfamily View Post
              Does your TV have a scart input
              Sadly no.

              The TV has:

              1- 3 RCA (Composite) inputs at the back
              2- 1 YPbPr (Component) input at the back
              3- 1 RCA (Composite) input at the front
              4- 1 S-video input at the front
              5- 1 S-video input at the back
              Last edited by sultanpepper; 05-16-2022, 12:55 PM.

              Comment


                #8
                Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                Originally posted by kasfamily View Post
                Does the PS have an rf module included ?
                Sadly no

                Comment


                  #9
                  Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                  Are you satisfied with the video from the x-box on the component input?

                  Comment


                    #10
                    Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                    Originally posted by kasfamily View Post
                    Are you satisfied with the video from the x-box on the component input?
                    Actually no , the colors are shifted as you can see below

                    Comment


                      #11
                      Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                      Is the OSD image on the TV screen normal ?

                      Comment


                        #12
                        Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                        Originally posted by kasfamily View Post
                        Is the OSD image on the TV screen normal ?
                        yes the OSD TV settings menu look 10/10

                        Comment


                          #13
                          Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                          Have you tried connecting an xbox to a composite input RCA ?

                          Comment


                            #14
                            Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                            Hello, Yes I've recorded OG Xbox on composite input RCA as well ,

                            1- AV1 (Composite cable from a OG Xbox ):
                            https://www.youtube.com/watch?v=2LLz_DR7gtM
                            2- AV2 (Composite cable from a OG Xbox ):
                            https://www.youtube.com/watch?v=5HdMMLGjWfA
                            3- AV3 (Composite cable from a OG Xbox ):
                            https://www.youtube.com/watch?v=OxAS3mfC-DU
                            4- DVD (Component cable from a OG Xbox ):
                            https://www.youtube.com/watch?v=FgS4MNPdFKM

                            Comment


                              #15
                              Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                              Originally posted by sultanpepper View Post
                              Hello, Yes I've recorded OG Xbox on composite input RCA as well ,

                              1- AV1 (Composite cable from a OG Xbox ):
                              https://www.youtube.com/watch?v=2LLz_DR7gtM
                              2- AV2 (Composite cable from a OG Xbox ):
                              https://www.youtube.com/watch?v=5HdMMLGjWfA
                              3- AV3 (Composite cable from a OG Xbox ):
                              https://www.youtube.com/watch?v=OxAS3mfC-DU
                              4- DVD (Component cable from a OG Xbox ):
                              https://www.youtube.com/watch?v=FgS4MNPdFKM
                              Have you tried to change the color mode of the TV using the remote control?

                              Comment


                                #16
                                Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                                Originally posted by kasfamily View Post
                                Have you tried to change the color mode of the TV using the remote control?
                                Hello , my apologies for the late response. I've uploaded a couple of photos for the Chassis PCB as per your request.







                                Also I've opened up the TV and took out the Chassis ( Main PCB ) and measured voltage rails and they are very low. Secondary all are very low and the main offline regulator IC I've measured it's Vin Supply and it's supposed to be 16V but its 12-13V and it's fluctuating. Please let me know if you have any ideas I'm at a road block

                                Note: Since I have the service manual, I've used the schematics as a guide but I spent an entire day pulling out suspected components and measuring them ( caps and diodes ) but nothing was out of the ordinary.... please help .....

                                BR
                                Last edited by sultanpepper; 05-26-2022, 04:13 PM.

                                Comment


                                  #17
                                  Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                                  Start by replacing C811 47µf/50v, it is likey weak, I would also replace C826 47µf/160v as a precaution.

                                  Comment


                                    #18
                                    Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                                    Originally posted by R_J View Post
                                    Start by replacing C811 47µf/50v, it is likey weak, I would also replace C826 47µf/160v as a precaution.
                                    thanks for the suggestion, I replaced those and alot more at critical areas. Still the same .

                                    BR

                                    Comment


                                      #19
                                      Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

                                      Originally posted by kasfamily View Post
                                      Does the PS have an rf module included ?
                                      I borrowed an old VCR and connected it to the RF input and the screen is showing same distorted picture .... any clue what that might mean when all inputs give bad screen ?

                                      Also I've discovered that by hooking up the chassis board back to the crt the voltages readings were good; mainly voltages at the flyback IC were fine and at the secondary windings the voltage regulators outputs were fine as well.

                                      I changed the vertical IC just for kicks but it did nothing .Also I tried recapping around the voltage regulators and the vertical IC .


                                      BR
                                      Last edited by sultanpepper; 06-15-2022, 03:24 PM.

                                      Comment

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