Hitachi LE55A6R9A confirm bad LEDs

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  • jason424
    Senior Member
    • Dec 2015
    • 187
    • United States

    #1

    Hitachi LE55A6R9A confirm bad LEDs

    I was just given this set, I've looked at many posts and videos that point towards the leds going bad on this set. I've tested the boards and the leads going to the leds and get high voltage at them (287 at red/black lines in pic attached). According to this post sounds like that means an open circuit and the leds should be tested?
    Attached Files
  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #2
    Re: Hitachi LE55A6R9A confirm bad LEDs

    My experience so far is bad leds. If they flash when you first turn it on I pull the panel and inevitably failed leds.
    I assume no responsibility for any stupid suggestions I might post.

    Comment

    • jason424
      Senior Member
      • Dec 2015
      • 187
      • United States

      #3
      Re: Hitachi LE55A6R9A confirm bad LEDs

      I don't get a flash at all when turning the set on. Just red to blue power led changing.
      Also, is there a specific brand of led tester to look for? Price point?
      Last edited by jason424; 04-18-2017, 06:06 AM.

      Comment

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6642
        • Wales

        #4
        Re: Hitachi LE55A6R9A confirm bad LEDs

        Have you disconnected the main board and then powered up to see if the backlights come on.
        Do you have a photo of your circuit boards?
        Willing to help but I'm no expert.

        Comment

        • jason424
          Senior Member
          • Dec 2015
          • 187
          • United States

          #5
          Re: Hitachi LE55A6R9A confirm bad LEDs

          If I disconnect the main board I got nothing. No power led or anything since it looks like it's integrated into the main. Pics attached.
          Attached Files

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #6
            Re: Hitachi LE55A6R9A confirm bad LEDs

            Behind CN201 you have legends along side the pins. What voltages do you have on each pin.

            Pin number.......Pin Name...... Pin voltage
            etc
            Willing to help but I'm no expert.

            Comment

            • dskall
              Badcaps Legend
              • Oct 2016
              • 2905
              • usa

              #7
              Re: Hitachi LE55A6R9A confirm bad LEDs

              Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
              Format:
              Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
              1 - XXXXXXX - XXv - XXXv
              2 - XXXXXXX - XXXv - XXXv
              3 - XXXXXXX - XXXv - XXXv
              4 - etc.



              Here's tester led tester I have. http://www.ebay.com/itm/NEW-110V-265...item3ad03eb6c6
              I assume no responsibility for any stupid suggestions I might post.

              Comment

              • jason424
                Senior Member
                • Dec 2015
                • 187
                • United States

                #8
                Re: Hitachi LE55A6R9A confirm bad LEDs

                CN201:
                12v: 12.2
                12v: 12.2
                12v: 12.2
                GND: 0
                GND: 0
                GND: 0
                GND: 0
                BK/ON: 3.2
                ADJ: 3.1
                PS/ON: 3.2

                EDIT: Pic attached of desc/table
                Attached Files
                Last edited by jason424; 04-18-2017, 10:41 AM.

                Comment

                • jason424
                  Senior Member
                  • Dec 2015
                  • 187
                  • United States

                  #9
                  Re: Hitachi LE55A6R9A confirm bad LEDs

                  CN202:
                  268
                  187

                  CN203:
                  187
                  0.00

                  When testing CN202(red) and CN203(black) I get 287 as outlined in the first post.
                  Attached Files

                  Comment

                  • jason424
                    Senior Member
                    • Dec 2015
                    • 187
                    • United States

                    #10
                    Re: Hitachi LE55A6R9A confirm bad LEDs

                    con901:

                    gnd: 0
                    key0: 3.3
                    key1: 3.3
                    led-g: 3.0
                    led-r: .1
                    ir-in: 5.2
                    gnd: 0
                    5v: 5.2
                    Attached Files

                    Comment

                    • jason424
                      Senior Member
                      • Dec 2015
                      • 187
                      • United States

                      #11
                      Re: Hitachi LE55A6R9A confirm bad LEDs

                      con701:

                      l+: .2
                      l-: .2
                      r-: .2
                      r+: .2
                      Attached Files

                      Comment

                      • Andrew F. Ali
                        Badcaps Legend
                        • Jan 2014
                        • 2450
                        • Trinidad & Tobago

                        #12
                        Re: Hitachi LE55A6R9A confirm bad LEDs

                        Confirmed....Bad LED backlights.

                        Comment

                        • jason424
                          Senior Member
                          • Dec 2015
                          • 187
                          • United States

                          #13
                          Re: Hitachi LE55A6R9A confirm bad LEDs

                          Thank you everyone for your help/confirmation.

                          Looks like ShopJimmy is out of the replacements at the moment so I will wait until they're back in stock. In the mean time I will order the tester.

                          Is is best to just replace all the led strips instead of just isolating those that are bad and just replace those?

                          Comment

                          • dskall
                            Badcaps Legend
                            • Oct 2016
                            • 2905
                            • usa

                            #14
                            Re: Hitachi LE55A6R9A confirm bad LEDs

                            Preference I guess I just replace bad leds. Shopjimmy is selling used strips. Thier like bad caps now they all going to fail
                            I assume no responsibility for any stupid suggestions I might post.

                            Comment

                            • Shane711
                              Badcaps Veteran
                              • Dec 2014
                              • 493
                              • USA

                              #15
                              Re: Hitachi LE55A6R9A confirm bad LEDs

                              I got this TV, I am just going to heat the bad LEDs off the strip and heat replacement LEDs from another TV onto the strip. Why buy a strip when I have lots of these LEDs laying around. A heat gun works great for changing them out, a soldering iron will NOT work.

                              Comment

                              • jason424
                                Senior Member
                                • Dec 2015
                                • 187
                                • United States

                                #16
                                Re: Hitachi LE55A6R9A confirm bad LEDs

                                Originally posted by Shane711
                                I got this TV, I am just going to heat the bad LEDs off the strip and heat replacement LEDs from another TV onto the strip. Why buy a strip when I have lots of these LEDs laying around. A heat gun works great for changing them out, a soldering iron will NOT work.
                                I ordered the tester and found that all but 1 were out on a strip so I replaced the whole strip and removed the one that was still good and threw it in my parts pile

                                Comment

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