Hitachi l32s504

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • ozzy214
    Badcaps Veteran
    • Nov 2013
    • 319
    • usa

    #1

    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.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #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

    • ozzy214
      Badcaps Veteran
      • Nov 2013
      • 319
      • usa

      #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

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #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

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 7969
          • Canada

          #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

          Related Topics

          Collapse

          • Tynan Dill
            Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
            by Tynan Dill
            I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

            Upon bringing it home and plugging it up, it showed a standby light.

            I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

            The screen seems to blackout and stay black, but with a flashlight I can see the display.

            With my Playstation 4 connected via HDMI, and running a game I can hear sound.

            Assuming...
            11-22-2024, 01:46 PM
          • Dani_2024
            Sceptre U550CV-UMR 4K LED, Bad Caps on Main Power Board?
            by Dani_2024
            Hi and thanks in advance for any input you might provide!
            I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
            Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO

            Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this...
            10-28-2024, 05:06 PM
          • JDC
            (SOLVED) - ONN 100012588 No Power, Then Rebooting After Main Board Change
            by JDC
            ONN 100012588
            Issue: No Power, Then Rebooting After Main Board Change

            Short answer: replace main board and power board
            Technical answer: replace main board and Q306 & Q307 on power board.

            Long answer:

            TV wouldn't turn on. Power switch was fine which means the main board isn't processing the power on signal. Replaced main board. TV turns on now but randomly reboots. Bad main board? EEPROM? Tried to pull main board and got a shock touching the corner of the board. That's weird. C334 (450V 10uf) capacitor is still holding a high charge....
            07-15-2022, 07:39 AM
          • m1ch43lzm
            HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
            by m1ch43lzm
            Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
            Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
            05-12-2025, 08:37 PM
          • Asraf Atb
            Help Needed: Samsung UE55MU8000 Dead - Possible Main Board Issue
            by Asraf Atb
            Hi everyone,

            Im looking for some advice regarding my Samsung UE55MU8000 TV with main board model BN94-11606C. The TV suddenly stopped turning on and now shows no signs of life at all not even the standby light at the bottom.

            Initially, I suspected an issue with the PSU, so I took it to a repair center. They tested it and confirmed that the PSU works perfectly, even on other TVs. Based on that, I started investigating the main board.

            I disconnected the main board from the PSU, and the backlight turned on, which seems to confirm the main board is the issue....
            01-27-2025, 05:02 PM
          • Loading...
          • No more items.
          Working...