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Hitachi l32s504

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    Hitachi l32s504

    This one is confusing me. I was thinking bad main board, but now not so sure. I get red standby and no power on. I check and the power supply is being activated by main board as power supply is on with all correct voltages per chart on psu.

    So I look no main available anywhere, so I decided to check other things like backlight for a good parts list.

    Now this is the wonky part. Main disconnected, psu turns off/on no issue. All voltages stable. Hooked up invertor to check the bulbs and such, they are flashing like xmas lights. Checked the inverter lines and it is as down as far as 17v from 24v no load. Which explains the flashing strobe.

    So now my question and bewilderment is is it possible psu bad? And thats why it wont turn on? I know I have constant psu on from the main as soon as it plugged in, but if the psu wont handle the load...hmm.

    Hopefully you can point me in the direction and understand my rambling. Only other thing I can think of is both main and psu are bad at once.

    I mostly discovered this, because I was thinking of making a halloween decoration out of it. But the psu wont keep the lights on lol.

    #2
    Re: Hitachi l32s504

    "I get red standby and no power on. I check and the power supply is being activated by main board as power supply is on with all correct voltages per chart on psu." so you are saying ALL Voltages are correct INCLUDING THE 24VDC feeding the inverter board (inverter board is still connected), and the PS-ON is present?
    "Main disconnected, psu turns off/on no issue" So how did you turn the power supply on and off without main board connected? Using the resistors?
    May be we need better explanation and the pictures.
    Last edited by budm; 10-10-2015, 10:17 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


      #3
      Re: Hitachi l32s504

      Yes main is turning on psu, but no backlight. I do get all correct voltages to inverter board. But no back light. REd standby light stays present and main board is sending power on to psu. If I disconnect main and use a jumper wire to power on, black lights flash off and on like a strobe.....voltage invertor is 17v, before it was steady at 24v.

      Will get pics in bit.

      Comment


        #4
        Re: Hitachi l32s504

        OK, I will wait for the pictures of the whole back side of the TV so I can see how all the boards are connected together and then the pictures of the power supply board and the inverter board.
        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


          #5
          Re: Hitachi l32s504

          Any pictures of the boards and the pin outs? Probe each pin and write it down with the corresponding pin out.

          Comment

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