Lg 32LH500 not powering on.

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • habanerocat
    Senior Member
    • Nov 2014
    • 96
    • Ireland

    #1

    Lg 32LH500 not powering on.

    The LED on the front turns on.
    I'm getting the 5VDC from the PSU but nothing else.

    The ON push button relays the signal to the main board but nothing else happens. None of the other supplies or signals become active.

    Any ideas please?

    Thanks!
    Attached Files
    Last edited by habanerocat; 08-09-2017, 04:58 AM.
  • habanerocat
    Senior Member
    • Nov 2014
    • 96
    • Ireland

    #2
    Re: Lg 32LH500 not powering on.

    Sorry can't edit post above.

    That title should read "LG 32LH5000 Not Powering On". Thanks.....

    Comment

    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales

      #3
      Re: Lg 32LH500 not powering on.

      Separate the main board and use a 1K resistor to jumper between Power_ON and 5V stby on the power supply connections then check you have all the secondary dc supplies i.e. 12V & 24V.

      You can also jumper 5V stby to INVOn/Off using a second 1K resistor and check your backlights come on.
      Willing to help but I'm no expert.

      Comment

      • habanerocat
        Senior Member
        • Nov 2014
        • 96
        • Ireland

        #4
        Re: Lg 32LH500 not powering on.

        Originally posted by dick_barton
        Separate the main board and use a 1K resistor to jumper between Power_ON and 5V stby on the power supply connections then check you have all the secondary dc supplies i.e. 12V & 24V.

        You can also jumper 5V stby to INVOn/Off using a second 1K resistor and check your backlights come on.
        Many thanks for that.
        I've done this before on a plasma and had lots of problems. I wasn't sure if I needed to separate the boards beforehand or not.

        I'll give it a go and let you know how I get on.

        Thanks.....

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales

          #5
          Re: Lg 32LH500 not powering on.

          It's not a plasma set so there should be no problem.
          Willing to help but I'm no expert.

          Comment

          • habanerocat
            Senior Member
            • Nov 2014
            • 96
            • Ireland

            #6
            Re: Lg 32LH500 not powering on.

            Originally posted by dick_barton
            Separate the main board and use a 1K resistor to jumper between Power_ON and 5V stby on the power supply connections then check you have all the secondary dc supplies i.e. 12V & 24V.

            You can also jumper 5V stby to INVOn/Off using a second 1K resistor and check your backlights come on.
            Done that. DC supplies come active and the backlights turn on.
            So I assume my main board is gone.

            Can this be baked?
            I've been reading a bit about that lately.

            Thanks.....

            Comment

            Related Topics

            Collapse

            • iMic
              Vintage AT Power Supplies - Selecting Capacitors
              by iMic
              Hi,

              Back after a long hiatus with some old power supplies that need repairing. I've recently picked up a couple of 386SX systems, two 486DX systems, a SiliconGraphics Indy and an iMac G3 that either have verified leaking capacitors in their power supplies, or are likely to in the near future. For the sake of simplicity, instead of tackling all at once, I'm starting with the 386's and one of the 486's.


              The 386's power supplies are Seasonic SS4040A's, with caps that are visibly leaking, and 9 replacement caps per unit are required. Most appear to be from the Rubycon...
              02-19-2023, 06:45 PM
            • valvashon
              LG 55UH6150- trouble powering up, then half lit screen (pictures!)
              by valvashon
              The 55" LG has been in the basement for a few months without being used. Turned it on yesterday, set came on as it should and showed a complete screen for about 5 seconds (was on a broadcast channel but no antenna was connected), then the screen went mostly dark with about 1/3 of the screen on the right lighting up with brighter lines in that lit part (sorry, no pictures of that). Power LED was cycling too, preventing the TV from fully powering up.
              Pulled the back off, all boards looked OK. Pulled the LED connector, turned the set on to see if it would power up but I don't belive it...
              11-24-2024, 12:08 PM
            • ShadowAi12
              ASUS ROG STRIX B550-F GAMING — Board not powering on properly
              by ShadowAi12
              Hi,
              I recently bought an ASUS ROG STRIX B550-F GAMING motherboard that was listed as "dead, not powering on." However, it does show some signs of life. I've performed several basic measurements and would like to share the results.
              • The board enters a "ready to power on" state after plugging in the PSU.
              • Pressing the power button increases power draw.
              • Sometimes, touching the RSMRST_L pad with a multimeter probe causes the board to shut off and return to standby.
              Measurements:
              (taken after pressing the power button, while the board is attempting to start)
              • H_SKTOOC#
              ...
              06-11-2025, 01:05 PM
            • TechSplendid
              MacBook A2442 not powering on – suspecting CD3217, but replacement didn’t help
              by TechSplendid
              Hi All,

              I'm working on a MacBook Pro A2442 (14", 2021) that's not powering on. On two out of three USB-C ports, I get 5V and the current briefly ramps up to around 0.210A before dropping to 0.036A. On the third port (JF600), I only get 0.0045A and it stays there.

              Initially, I suspected a faulty CD3217 on that port, especially since I noticed signs of previous liquid damage near the JF600 USB connector. I replaced the CD3217 with an UF400 (from an A2442 donor board from the same location). According to the supplier, this should be a compatible version, but the behavior...
              04-09-2025, 02:13 AM
            • rabbituk
              Sony HCD BX7700dbi CMT flashing standby
              by rabbituk
              I have got a Sony HCD-BX7700dbi that isn't worth a lot but I'm keen to learn how to repair and would appreciate some help with my train of thought. The protection circuit is kicking in and the standby light is blinking. It goes into protection mode within a second of powering it on.

              So far the relay on the power board that enables the main transformer clicks on and then off when powering on the unit. Looking at the schematics, the permanently enabled power rail called 'unreg sub' provides about 13.5VDC. Where the power comes into the main board on connector CN303, there is a diode...
              02-11-2025, 05:05 PM
            • Loading...
            • No more items.
            Working...