Ilo lct32ha36 dead

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  • Beowulf
    Senior Member
    • Dec 2012
    • 175
    • USA

    #1

    Ilo lct32ha36 dead

    Hi,

    This tv looks dead, meaning there's no LED on.

    Looking inside none of the output voltages are present.

    Both fuses are OK on the PSU.

    I get 179v on both filter caps.

    On 0565r IC this is what I get:

    Pin
    1-179V
    2-GND
    3-VARIES CONTINUOUSLY FROM 9 TO 14V
    4-VARIES CONTINUOUSLY FROM 0 TO 3V
    5-NC
    6-VARIES CONTINUOUSLY FROM 0 TO 1.7V

    Attached is the datasheet for the 0565r IC.

    I'd appreciate any pointer on what to check next.

    Regards,
    Attached Files
  • LDSisHere
    Badcaps Veteran
    • May 2012
    • 727
    • U.S.A.

    #2
    Re: Ilo lct32ha36 dead

    I would advise you to pull the silver cover off of the main board(s) and have a look at the electrolytics there. I had one of these and the main board was covered in bad caps. One had even lost the outer sleeve.

    Comment

    • cashkennedy
      Badcaps Veteran
      • Aug 2011
      • 666
      • USA

      #3
      Re: Ilo lct32ha36 dead

      I assume from your original post that you have used a resistor to start the power supply / and checked the voltages at the connectors on the edge of the PSU?

      If that's correct then your on the right track checking the power supply as the power supply should be able to start on its own if you force it to regardless of the main board.
      Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Ilo lct32ha36 dead

        It sounds like that standby power supply is trying to start, try heating up those small caps by the IC with hair dryer for 2-3 minutes to see if you can get out put voltage at the filter caps on the secondary side of the transformer.
        Attached Files
        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

        • Beowulf
          Senior Member
          • Dec 2012
          • 175
          • USA

          #5
          Re: Ilo lct32ha36 dead

          Originally posted by LDSisHere
          I would advise you to pull the silver cover off of the main board(s) and have a look at the electrolytics there. I had one of these and the main board was covered in bad caps. One had even lost the outer sleeve.
          Hey thanks for the pointers, I'll check it out just in case.

          Originally posted by cashkennedy
          I assume from your original post that you have used a resistor to start the power supply / and checked the voltages at the connectors on the edge of the PSU?

          If that's correct then your on the right track checking the power supply as the power supply should be able to start on its own if you force it to regardless of the main board.
          Uh! I think this one is an always-on, also I still should be able to get standby voltages. Thanks for the input.

          Originally posted by budm
          It sounds like that standby power supply is trying to start, try heating up those small caps by the IC with hair dryer for 2-3 minutes to see if you can get out put voltage at the filter caps on the secondary side of the transformer.
          Alright I put some little heat on those caps and something weird happened, one smd resistor on the bottom side of the board blew up big time And no, none of the fuses got blown.

          Hell I bought a board for $54 from shop jimmy. I'm not giving up on the repair though. I'll use the good board to help me fix this one and have two. Use one and post the other one for sell on ebay. Give me a few days to get back with an update.

          Thx
          Attached Files
          Last edited by Beowulf; 05-11-2013, 08:59 AM.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Ilo lct32ha36 dead

            Hmm, that SMD resistor that blew up seems to be connected in parallel with the other 2 large grey through hole resistors. Those resistors seems to be connected in parallel with the two large filter caps (450Vdc caps). Can you verify that?
            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

            • Beowulf
              Senior Member
              • Dec 2012
              • 175
              • USA

              #7
              Re: Ilo lct32ha36 dead

              Originally posted by budm
              Hmm, that SMD resistor that blew up seems to be connected in parallel with the other 2 large grey through hole resistors. Those resistors seems to be connected in parallel with the two large filter caps (450Vdc caps). Can you verify that?
              The three resistors are in parallel among them yeah. One side of the resistors connect to the negative of the filter caps and the other goes to a pin of the bridge rectifier labeled as (-) negative.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Ilo lct32ha36 dead

                That does not make sense at all since the negative of the bridge should be directly connected to the negative legs of those two filter caps. I am trying to trace out the connections but having hard time doing it.
                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

                • Beowulf
                  Senior Member
                  • Dec 2012
                  • 175
                  • USA

                  #9
                  Re: Ilo lct32ha36 dead

                  Call me crazy but I've checked it like ten times visually and using continuity with the meter. I also found it rather strange. It wouldn't be the first time I get a tv with manufacturing defects. I'm anxious to see how the one I ordered is wired up.

                  Attached is a picture explaining it more.
                  Attached Files

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Ilo lct32ha36 dead

                    How low is the resistance of those resistors, less than 1 Ohm? It may be using that as fusible resistors.
                    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

                    • Beowulf
                      Senior Member
                      • Dec 2012
                      • 175
                      • USA

                      #11
                      Re: Ilo lct32ha36 dead

                      They're 0.39 Ohms. And they're cracked, probably from that little incident earlier lol.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Ilo lct32ha36 dead

                        For now, it is OK to leave it as is, I do not really know why it has small 1/8W resistor in parallel with the other two large Wattage resistors, since the circuit is not open, the two caps will be charged up OK. I would like to find out if heating those small caps in the standby power supply make it start running again.
                        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

                        • Beowulf
                          Senior Member
                          • Dec 2012
                          • 175
                          • USA

                          #13
                          Re: Ilo lct32ha36 dead

                          Alright I'll try that tomorrow.

                          Comment

                          • Beowulf
                            Senior Member
                            • Dec 2012
                            • 175
                            • USA

                            #14
                            Re: Ilo lct32ha36 dead

                            Alright I tried it like this and put some heat on those little caps and it did not do anything.

                            Comment

                            • retiredcaps
                              Badcaps Legend
                              • Apr 2010
                              • 9271

                              #15
                              Re: Ilo lct32ha36 dead

                              Originally posted by Beowulf
                              I'd appreciate any pointer on what to check next.
                              From PlainBill, I learned there are 3 likely suspects.

                              1) the startup cap is bad - easy and cheap to replace with a Panasonic FC. I like to keep a stash of 47uF 50V and/or 22uF 50V caps just for these occasions.
                              2) the SMPS IC is bad
                              3) something shorted on the output side dragging down the power supply. something like a shorted diode. It would probably only take you 5 minutes to test all the diodes in circuit. If one reads shorted in circuit, desolder to verify readings.
                              Last edited by retiredcaps; 05-13-2013, 12:51 AM.
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                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Ilo lct32ha36 dead

                                I would replace those start up caps, they should be replaced anyway so you do not to replace them in the future, it should be part of the cap replacement kit.
                                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

                                • Beowulf
                                  Senior Member
                                  • Dec 2012
                                  • 175
                                  • USA

                                  #17
                                  Re: Ilo lct32ha36 dead

                                  Thanks guys. I'll let you know how it goes when I get down to working on this board again, after I receive the new one.

                                  I'll order some of those caps to keep in stock too.

                                  Regards,

                                  Comment

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