baird 42 flickering strobing wont start up

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #61
    Re: baird 42 flickering strobing wont start up

    right my findings are

    inverter 10 pin
    5 pins gnd
    5 pins fluctuate never hit the 24.0 always from 00.5 when spiking hit max 23.0

    audio 4 pin

    2 pins 24.0 same as inverter
    2 pins gnd

    main av
    all the values are the same here all from 0.5 without the spiking they never hit there correct voltages
    if you get what I mean so +12v never hits 12.0 always below

    1 +12v
    2 +12v
    3 sgnd
    4 sgnd
    5 sgnd
    6 +5v
    7 +5v
    8 5vsb
    9 stb
    10 +5v
    11 +5v
    12 sgnd
    13 sgnd

    Comment

    • notallbad
      Badcaps Legend
      • Oct 2012
      • 1183
      • UK

      #62
      Re: baird 42 flickering strobing wont start up

      Could you describe what the tv does in a bit more detail.
      From turning on power from the mains socket?
      Then switching the TV's rocker switch, if it has one.
      And finally, actually turning the tv on, either from remote or keypad (front/side control) Power On button.

      What the front power light does, colour and flashes
      Backlight, ok strobing
      Any display on the screen

      Does the tv work perfectly fine other than the strobing?

      Comment

      • wreksta
        Badcaps Veteran
        • Aug 2013
        • 508
        • england

        #63
        Re: baird 42 flickering strobing wont start up

        Originally posted by notallbad
        Could you describe what the tv does in a bit more detail.
        From turning on power from the mains socket?
        Then switching the TV's rocker switch, if it has one.
        And finally, actually turning the tv on, either from remote or keypad (front/side control) Power On button.

        What the front power light does, colour and flashes
        Backlight, ok strobing
        Any display on the screen

        Does the tv work perfectly fine other than the strobing?
        tv don't power up upon plugging and pressing switch it starts to strobe for a lil bit then stops then strobes in a continuous cycle standby lit all time unless rocker switch pressed buttons on tv don't do anything

        Comment

        • vinceroger69
          Badcaps Legend
          • Mar 2012
          • 6714
          • uk

          #64
          Re: baird 42 flickering strobing wont start up

          You could with a 1kOHM resistor jump the PS ON pin (not to be confused with the BL On pin) and 5v stby pin, with main A/V b/d connector disconnected.

          can you try this with all the connectors disconnected i wonder if its a eprom issue on the main board? see if voltages still varies

          Comment

          • notallbad
            Badcaps Legend
            • Oct 2012
            • 1183
            • UK

            #65
            Re: baird 42 flickering strobing wont start up

            Yes, sounds like it could be. Up til now we (well I) assumed the tv powered up and worked, just that the backlights were strobing.

            If you don't have a 1kohm resistor just disconnect all connectors from the PS b/d then with DMM check that main filter cap with power on as you did for Tom earlier (see Post #11) just to see what voltage you get. Should be around 320v.
            Last edited by notallbad; 08-24-2013, 09:12 AM.

            Comment

            • wreksta
              Badcaps Veteran
              • Aug 2013
              • 508
              • england

              #66
              Re: baird 42 flickering strobing wont start up

              that main filter cap is the big lying down one isn't it

              but I still need main power to the board just disconnect these
              av main
              audio
              inverter all from psu yes

              also I desoldered that right heatsink does it have to go back on just for a voltage check
              Last edited by wreksta; 08-24-2013, 09:16 AM.

              Comment

              • notallbad
                Badcaps Legend
                • Oct 2012
                • 1183
                • UK

                #67
                Re: baird 42 flickering strobing wont start up

                Yes, as before careful not to cross the probes

                Only connector left should be the mains inlet connector.

                Dont bother with the heatsink as long as the PS is only on for a short period. The heatsink disperses the heat generated by the diodes/transistors screwed to it, without it and run for too long they will overheat and get damaged.

                Do you have a 1k ohm resistor (or something close to it)? You ideally need one to get the PS fully running to check the voltage on that cap.
                Last edited by notallbad; 08-24-2013, 09:27 AM.

                Comment

                • wreksta
                  Badcaps Veteran
                  • Aug 2013
                  • 508
                  • england

                  #68
                  Re: baird 42 flickering strobing wont start up

                  meter set 600 vdc with all disconnected cept main power in
                  big cap gives me 330 either way on the probes
                  20vdc and 200vdc give me nothing

                  Comment

                  • notallbad
                    Badcaps Legend
                    • Oct 2012
                    • 1183
                    • UK

                    #69
                    Re: baird 42 flickering strobing wont start up

                    Is the reading steady? It may go up to 331 or go down to 329 occasionally but thats fine as long as its not unstable, i.e jumping around erratically.

                    With the probes reversed you should get a - (negative) reading but the value will be the same.

                    With DMM on 20 V DC, you can only take a reading of up to 20v, with DMM set to 200 you can only take a reading of up to 200volts.
                    You have measured 330v which is within 600v setting so that is correct.
                    Last edited by notallbad; 08-24-2013, 09:34 AM.

                    Comment

                    • wreksta
                      Badcaps Veteran
                      • Aug 2013
                      • 508
                      • england

                      #70
                      Re: baird 42 flickering strobing wont start up

                      yeah it does not bounce fluxuate 330 steady

                      Comment

                      • notallbad
                        Badcaps Legend
                        • Oct 2012
                        • 1183
                        • UK

                        #71
                        Re: baird 42 flickering strobing wont start up

                        thats good

                        do you have a resistor?

                        Comment

                        • wreksta
                          Badcaps Veteran
                          • Aug 2013
                          • 508
                          • england

                          #72
                          Re: baird 42 flickering strobing wont start up

                          got loadfs on different boards need the colours to help me mate

                          Comment

                          • notallbad
                            Badcaps Legend
                            • Oct 2012
                            • 1183
                            • UK

                            #73
                            Re: baird 42 flickering strobing wont start up

                            Use the DMM set to the ohm 2k setting, one probe on each end of the resistor will give you the resistors ohms, unsolder a few and check them, you may be lucky.

                            look for ones like these and unsolder and check with the DMM just to be sure, but these should get you in the region of 1k ohm or 1000 ohms
                            3 band brown black red possibly
                            4 band brown black red don't matter about the last one thats just for tolerance
                            5 band brown black black brown don't matter about the last one thats just for tolerance

                            For 1.2k ohm
                            3 band brown red red possibly
                            4 band brown red red don't matter about the last one thats just for tolerance
                            5 band brown red black brown don't matter about the last one thats just for tolerance
                            Last edited by notallbad; 08-24-2013, 10:01 AM.

                            Comment

                            • wreksta
                              Badcaps Veteran
                              • Aug 2013
                              • 508
                              • england

                              #74
                              Re: baird 42 flickering strobing wont start up

                              ok then what do I do with that lol
                              ps-on wheres that I know the stb is on main av connector on psu

                              Comment

                              • notallbad
                                Badcaps Legend
                                • Oct 2012
                                • 1183
                                • UK

                                #75
                                Re: baird 42 flickering strobing wont start up

                                OK, lets see!

                                Looks like its Pin 8 and Pin 9, thats going by how you have numbered and labelled them in Post #61
                                Last edited by notallbad; 08-24-2013, 10:09 AM.

                                Comment

                                • wreksta
                                  Badcaps Veteran
                                  • Aug 2013
                                  • 508
                                  • england

                                  #76
                                  Re: baird 42 flickering strobing wont start up

                                  I only have 2000k'200k'20'2000'200 on the meter on ohms

                                  Comment

                                  • notallbad
                                    Badcaps Legend
                                    • Oct 2012
                                    • 1183
                                    • UK

                                    #77
                                    Re: baird 42 flickering strobing wont start up

                                    Set it to 2000, NOT 2000K

                                    You want a resistor thats around 1000 ohms
                                    Last edited by notallbad; 08-24-2013, 10:07 AM.

                                    Comment

                                    • wreksta
                                      Badcaps Veteran
                                      • Aug 2013
                                      • 508
                                      • england

                                      #78
                                      Re: baird 42 flickering strobing wont start up

                                      what do I do with it mate when I find one
                                      I don't hold it do I

                                      Comment

                                      • wreksta
                                        Badcaps Veteran
                                        • Aug 2013
                                        • 508
                                        • england

                                        #79
                                        Re: baird 42 flickering strobing wont start up

                                        bugger can seem to find one can I not use 2 470 Ohms 5% or I will keep looking

                                        Comment

                                        • notallbad
                                          Badcaps Legend
                                          • Oct 2012
                                          • 1183
                                          • UK

                                          #80
                                          Re: baird 42 flickering strobing wont start up

                                          soldered in series (end to end) will give you 940 ohms which is close enough but check them once soldered to be sure they are good and you get a reading of around 940 ohms

                                          Comment

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