PS-42Q97HD, not starting every time :( HELP !!!!

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  • jczarniak
    Senior Member
    • Oct 2015
    • 179
    • UK

    #1

    PS-42Q97HD, not starting every time :( HELP !!!!

    Hi,

    After switching OFF and ON from the power socket (sometimes a few times) TV is starting fine.

    Checked a few voltages:
    When TV struggle to switch on I've got:
    instead of 18V - 11.3V
    instead of 12V - 11.4V
    Va=33.5V

    After switching OFF and ON from the power socket (sometimes a few times) TV is starting fine and:
    18V test point - 18.5V
    12V - 12.4
    Va - 63.5V etc...

    TV works fine, stays on as long I want.
    Help, please.
    Attached Files
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: PS-42Q97HD, not starting every time HELP !!!!

    Have you checked for cold solder joints ?
    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

    • sordids999
      Badcaps Legend
      • May 2013
      • 2149
      • uk

      #3
      Re: PS-42Q97HD, not starting every time HELP !!!!

      +1 mate

      Comment

      • jczarniak
        Senior Member
        • Oct 2015
        • 179
        • UK

        #4
        Re: PS-42Q97HD, not starting every time HELP !!!!

        Originally posted by ReeceyBurger123
        Have you checked for cold solder joints ?
        Hi,
        Yes I did, didn't found anything.
        When TV is ON stays on forever
        Unplugging its power cord and plugging it back in, its the only solution which I found so far.
        Need to do it sometime a few times.

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales

          #5
          Re: PS-42Q97HD, not starting every time HELP !!!!

          A repair kit has the following components so you could check the following parts out.

          F801S
          FS801S
          QS801
          QS802
          DS803
          DS804
          RS812
          RS814
          ICS801
          Willing to help but I'm no expert.

          Comment

          • jczarniak
            Senior Member
            • Oct 2015
            • 179
            • UK

            #6
            Re: PS-42Q97HD, not starting every time HELP !!!!

            Originally posted by dick_barton
            A repair kit has the following components so you could check the following parts out.

            F801S
            FS801S
            QS801
            QS802
            DS803
            DS804
            RS812
            RS814
            ICS801
            All them parts looks OK.

            Comment

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

              #7
              Re: PS-42Q97HD, not starting every time HELP !!!!

              Hmm this model Psu is known for bad caps, have you an esr meter ? If not does heating the Psu with a hairdryer help it come on faster ?
              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

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

                #8
                Re: PS-42Q97HD, not starting every time HELP !!!!

                Originally posted by dick_barton
                A repair kit has the following components so you could check the following parts out.

                F801S
                FS801S
                QS801
                QS802
                DS803
                DS804
                RS812
                RS814
                ICS801
                Lol DB re-read the thread it does come on after a sec.
                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

                • dick_barton
                  Badcaps Legend
                  • Aug 2015
                  • 6642
                  • Wales

                  #9
                  Re: PS-42Q97HD, not starting every time HELP !!!!

                  I realise it's the parts list for a faulty psu but considered it may be worthwhile checking the components.
                  Have the resistors changed value, check the components/solder joints around the IC for example.
                  It was just a thought although as you say it is often capacitors that cause this problem.
                  Willing to help but I'm no expert.

                  Comment

                  • sordids999
                    Badcaps Legend
                    • May 2013
                    • 2149
                    • uk

                    #10
                    Re: PS-42Q97HD, not starting every time HELP !!!!

                    Originally posted by jczarniak
                    Hi,
                    Yes I did, didn't found anything.
                    When TV is ON stays on forever
                    Unplugging its power cord and plugging it back in, its the only solution which I found so far.
                    Need to do it sometime a few times.
                    have u actually reflowed any joints or just looked for cold solder joints ?

                    Comment

                    • jczarniak
                      Senior Member
                      • Oct 2015
                      • 179
                      • UK

                      #11
                      Re: PS-42Q97HD, not starting every time HELP !!!!

                      Originally posted by sordids999
                      have u actually reflowed any joints or just looked for cold solder joints ?
                      All suspected (and not also) joints has been re flowed.

                      A few new observations:
                      when TV is cold (has been switched off for 10 hrs) is switching ON straight away, works fine, stays ON etc...
                      When switched OFF after about 15 minutes of work, blue light which should be ON all the time (setup in menu) is like dimmed and comes back on after 10-15 minutes.
                      No chance to switch the TV ON, need to wait for good 10-15 minutes.

                      Comment

                      • flocko
                        Badcaps Legend
                        • Nov 2012
                        • 1121
                        • uk

                        #12
                        Re: PS-42Q97HD, not starting every time HELP !!!!

                        Please make yourself clear, when you say the set is off do you mean unplugged from wall socket, or in standby.Replaceing the small caps (50v) on hot side of the supply would be a good place to start from

                        Comment

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

                          #13
                          Re: PS-42Q97HD, not starting every time HELP !!!!

                          You need to isolate the Psu first, heat it and follow what I said.
                          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

                          • jczarniak
                            Senior Member
                            • Oct 2015
                            • 179
                            • UK

                            #14
                            Re: PS-42Q97HD, not starting every time HELP !!!!

                            Just found the burn mark under zener diode ZDB803 (already removed on the picture)
                            Could it be a reason of all my problems with that power supply?

                            Can't find replacement anywhere - MTZJ30C
                            Can I use any equivalent, please?
                            Thank you.
                            Attached Files
                            Last edited by jczarniak; 09-27-2016, 03:35 AM.

                            Comment

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales

                              #15
                              Re: PS-42Q97HD, not starting every time HELP !!!!

                              Zener Diodes Zener 500mW 2,5% 30V

                              Data sheet available from:


                              http://eu.mouser.com/ProductDetail/T...8wxQLQMw%3d%3d

                              CPC, RS or Farnell will probably supply them or its equivalent.
                              Willing to help but I'm no expert.

                              Comment

                              • jczarniak
                                Senior Member
                                • Oct 2015
                                • 179
                                • UK

                                #16
                                Re: PS-42Q97HD, not starting every time HELP !!!!

                                Originally posted by dick_barton
                                Zener Diodes Zener 500mW 2,5% 30V

                                Data sheet available from:


                                http://eu.mouser.com/ProductDetail/T...8wxQLQMw%3d%3d

                                CPC, RS or Farnell will probably supply them or its equivalent.
                                Thanks a lot.
                                What you thing about this one, please:

                                http://uk.rs-online.com/web/p/zener-diodes/0812572/

                                Thank you.

                                Comment

                                • dick_barton
                                  Badcaps Legend
                                  • Aug 2015
                                  • 6642
                                  • Wales

                                  #17
                                  Re: PS-42Q97HD, not starting every time HELP !!!!

                                  The tolerance is twice the value but same working voltage and higher power dissipation so worth a try. May be worth your while checking around that circuit to see if anything else has failed and caused the zener to overheat.

                                  Have you got a Maplins near you?
                                  Willing to help but I'm no expert.

                                  Comment

                                  • jczarniak
                                    Senior Member
                                    • Oct 2015
                                    • 179
                                    • UK

                                    #18
                                    Re: PS-42Q97HD, not starting every time HELP !!!!

                                    Originally posted by dick_barton
                                    The tolerance is twice the value but same working voltage and higher power dissipation so worth a try. May be worth your while checking around that circuit to see if anything else has failed and caused the zener to overheat.

                                    Have you got a Maplins near you?
                                    Yes, 5 minutes drive

                                    Comment

                                    • jczarniak
                                      Senior Member
                                      • Oct 2015
                                      • 179
                                      • UK

                                      #19
                                      Re: PS-42Q97HD, not starting every time HELP !!!!

                                      Originally posted by jczarniak
                                      Yes, 5 minutes drive
                                      Something like that?

                                      http://www.maplin.co.uk/p/bzx85c-30v...er-diode-qf64u

                                      Comment

                                      • sordids999
                                        Badcaps Legend
                                        • May 2013
                                        • 2149
                                        • uk

                                        #20
                                        Re: PS-42Q97HD, not starting every time HELP !!!!

                                        Have u tested the diode ?
                                        and i would certainly do what flocko said start testing the caps etc

                                        Comment

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