hitachi 32HXC01U no backlight pl501 has 24v

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #1

    hitachi 32HXC01U no backlight pl501 has 24v

    hitachi 32HXC01U no backlight

    hi all got thguis set in and has a picture if you shine a torch
    backlights wont come on

    ive measured pl501 connector ande i get 23.9 on the black wire and 00.1 on the red wire this seems strange to me

    ive checked led array and found one broke led but no short

    can any one elaborate on this for me
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: hitachi 32HXC01U no backlight pl501 has 24v

    If you found a broke Led that will cause the whole lot not to work, more than likely the Led has failed Open not Short. These are wired like christmas lights one out all out, you will need to replace that Led as with it not being present/broken it wont complete the ciruit so non will light.
    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

    • wreksta
      Badcaps Veteran
      • Aug 2013
      • 508
      • england

      #3
      Re: hitachi 32HXC01U no backlight pl501 has 24v

      cant i bypass it mate for testing purposes
      if soi how please

      Comment

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

        #4
        Re: hitachi 32HXC01U no backlight pl501 has 24v

        You can with a zener diode normally a 3w type you will need to reverse bias the diode though. Best bet is to get a new Led tbh what type of strip is it can you take some photos ?
        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

        • wreksta
          Badcaps Veteran
          • Aug 2013
          • 508
          • england

          #5
          Re: hitachi 32HXC01U no backlight pl501 has 24v

          i dont have any photos mate but these are them here

          Comment

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

            #6
            Re: hitachi 32HXC01U no backlight pl501 has 24v

            Ahh right, internet says this is an edge lit tv but this is a full array type, which Led is faulty ?
            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/

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            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: hitachi 32HXC01U no backlight pl501 has 24v

              Oh one of these again
              A 68 ohm resistor (3W, no less) also works, the circuit is constant current driven, just need a reasonable resistance.
              Once you fix this set modify PSU and remove all but one of the 0R20 current sense resistors, SMD on the bottom, this will reduce LED current by 40%, which improves lifetime. (the drop in brightness is barely noticeable.)
              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

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

                #8
                Re: hitachi 32HXC01U no backlight pl501 has 24v

                These full array types are dropping like flies just done an Lg 42" (thread to come) with the same failure more Led Trash !
                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

                • wreksta
                  Badcaps Veteran
                  • Aug 2013
                  • 508
                  • england

                  #9
                  Re: hitachi 32HXC01U no backlight pl501 has 24v

                  thing is ive tested all the leds and work i have the right voltage so why are they not firing
                  any ideas on this please

                  Comment

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

                    #10
                    Re: hitachi 32HXC01U no backlight pl501 has 24v

                    So you have tested each individual Led ?
                    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/

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

                      #11
                      Re: hitachi 32HXC01U no backlight pl501 has 24v

                      You said "one broke led" that one broke led will cause the whole lot not to work, so is there a broken led ?
                      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

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: hitachi 32HXC01U no backlight pl501 has 24v

                        Using diode test mode a good multimeter will make an LED light up.
                        If not, use a 3V coin cell battery.
                        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

                        • wreksta
                          Badcaps Veteran
                          • Aug 2013
                          • 508
                          • england

                          #13
                          Re: hitachi 32HXC01U no backlight pl501 has 24v

                          my meter lights them up mate and everyone of them tested works accept the broke one ive removed it and shows no shorts but still lights wont fire

                          anyt ideas

                          i get 23.9v going from connector to the the led array

                          so shouldnt these light up

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: hitachi 32HXC01U no backlight pl501 has 24v

                            They're in series - so of COURSE it won't work when you remove one of them!
                            It's like Xmas lights - one open circuit, none work.
                            That's why LED TVs suck for repairing.
                            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

                            • wreksta
                              Badcaps Veteran
                              • Aug 2013
                              • 508
                              • england

                              #15
                              Re: hitachi 32HXC01U no backlight pl501 has 24v

                              forgot to say ive replaced that led mate thing is do i need the screen connected for the leds to fire as been testing with bare frame only with power and main conected

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: hitachi 32HXC01U no backlight pl501 has 24v

                                Maybe you put the LED the wrong way around.
                                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

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

                                  #17
                                  Re: hitachi 32HXC01U no backlight pl501 has 24v

                                  What type of led have you replaced it with and is it soldered in the correct way ?
                                  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

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: hitachi 32HXC01U no backlight pl501 has 24v

                                    11 LEDs connected in series for each strip, 24VDC is not going to be enough to light them up.
                                    Did you have the meter attached to the connector to see if the Voltage did jump up higher than 24VDC and then settle down to 24VDC?
                                    More likely the two LED strips are connected in series so that will be 22 LEDs in series, the Drive Voltage will be much higher than 24VDC.
                                    Last edited by budm; 10-12-2015, 09:06 AM.
                                    Never stop learning
                                    Basic LCD TV and Monitor troubleshooting guides.
                                    http://www.badcaps.net/forum/showthr...956#post305956

                                    Voltage Regulator (LDO) testing:
                                    http://www.badcaps.net/forum/showthr...999#post300999

                                    Inverter testing using old CFL:
                                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                    http://s807.photobucket.com/user/budm/library/

                                    TV Factory reset codes listing:
                                    http://www.badcaps.net/forum/showthread.php?t=24809

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: hitachi 32HXC01U no backlight pl501 has 24v

                                      I had the same panel and it used 65V.
                                      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

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