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  1. Home
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  3. LG Ultrafine 5k (27MD5KA) Screen Issues - Bad PSU?

LG Ultrafine 5k (27MD5KA) Screen Issues - Bad PSU?

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askelectronics
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  • J This user is from outside of this forum
    J This user is from outside of this forum
    jet@hackertalks.com
    wrote on last edited by
    #1

    7 Year old monitor started to have panel issues today, no initiating event. Did the normal trouble shooting, shut every component down, disconnected, swapped cables, updated firmware, changed resolutions, etc... issue persisted.

    :::spoiler Took it apart to have a looksie

    Getting all the plastic snaps off the back of the monitor was the single longest part of this... very annoying. I miss easy to repair devices.
    :::

    :::spoiler The PSU has shorts!!

    :::

    :::spoiler the other side of the pcb is a transformer

    :::

    :::spoiler some other leaking seen as well

    :::

    :::spoiler both sides of the PSU in full

    :::

    :::spoiler the logic board looks fine

    :::

    I'm tempted to just fix the shorted pads and test the voltages... I probably should replace the transformer

    Lots of chatter on youtube about the thunderbolt ports dying on this monitor, but I don't think that is applicable to me. At least the PSU shouldn't look like this even if its not the core problem.

    Any insights or suggestions from those you have rescued erstwhile monitors? This is the first monitor that has ever fully died on me. I melted a laptop screen sitting too close to a fire.. heh, but it was still usable.

    Link Preview Image
    J E 3 Replies Last reply
    0
    • J jet@hackertalks.com

      7 Year old monitor started to have panel issues today, no initiating event. Did the normal trouble shooting, shut every component down, disconnected, swapped cables, updated firmware, changed resolutions, etc... issue persisted.

      :::spoiler Took it apart to have a looksie

      Getting all the plastic snaps off the back of the monitor was the single longest part of this... very annoying. I miss easy to repair devices.
      :::

      :::spoiler The PSU has shorts!!

      :::

      :::spoiler the other side of the pcb is a transformer

      :::

      :::spoiler some other leaking seen as well

      :::

      :::spoiler both sides of the PSU in full

      :::

      :::spoiler the logic board looks fine

      :::

      I'm tempted to just fix the shorted pads and test the voltages... I probably should replace the transformer

      Lots of chatter on youtube about the thunderbolt ports dying on this monitor, but I don't think that is applicable to me. At least the PSU shouldn't look like this even if its not the core problem.

      Any insights or suggestions from those you have rescued erstwhile monitors? This is the first monitor that has ever fully died on me. I melted a laptop screen sitting too close to a fire.. heh, but it was still usable.

      Link Preview Image
      J This user is from outside of this forum
      J This user is from outside of this forum
      jet@hackertalks.com
      wrote on last edited by
      #2

      I do have a video of the monitor freaking out, but I can't access catbox.moe and I don't know where else to upload

      1 Reply Last reply
      0
      • J jet@hackertalks.com

        7 Year old monitor started to have panel issues today, no initiating event. Did the normal trouble shooting, shut every component down, disconnected, swapped cables, updated firmware, changed resolutions, etc... issue persisted.

        :::spoiler Took it apart to have a looksie

        Getting all the plastic snaps off the back of the monitor was the single longest part of this... very annoying. I miss easy to repair devices.
        :::

        :::spoiler The PSU has shorts!!

        :::

        :::spoiler the other side of the pcb is a transformer

        :::

        :::spoiler some other leaking seen as well

        :::

        :::spoiler both sides of the PSU in full

        :::

        :::spoiler the logic board looks fine

        :::

        I'm tempted to just fix the shorted pads and test the voltages... I probably should replace the transformer

        Lots of chatter on youtube about the thunderbolt ports dying on this monitor, but I don't think that is applicable to me. At least the PSU shouldn't look like this even if its not the core problem.

        Any insights or suggestions from those you have rescued erstwhile monitors? This is the first monitor that has ever fully died on me. I melted a laptop screen sitting too close to a fire.. heh, but it was still usable.

        Link Preview Image
        J This user is from outside of this forum
        J This user is from outside of this forum
        jet@hackertalks.com
        wrote on last edited by jet@hackertalks.com
        #3

        I found a used parts PSU board on aliexpress for $40 USD that claims to be tested and working, might as well grab that.

        1 Reply Last reply
        0
        • J jet@hackertalks.com

          7 Year old monitor started to have panel issues today, no initiating event. Did the normal trouble shooting, shut every component down, disconnected, swapped cables, updated firmware, changed resolutions, etc... issue persisted.

          :::spoiler Took it apart to have a looksie

          Getting all the plastic snaps off the back of the monitor was the single longest part of this... very annoying. I miss easy to repair devices.
          :::

          :::spoiler The PSU has shorts!!

          :::

          :::spoiler the other side of the pcb is a transformer

          :::

          :::spoiler some other leaking seen as well

          :::

          :::spoiler both sides of the PSU in full

          :::

          :::spoiler the logic board looks fine

          :::

          I'm tempted to just fix the shorted pads and test the voltages... I probably should replace the transformer

          Lots of chatter on youtube about the thunderbolt ports dying on this monitor, but I don't think that is applicable to me. At least the PSU shouldn't look like this even if its not the core problem.

          Any insights or suggestions from those you have rescued erstwhile monitors? This is the first monitor that has ever fully died on me. I melted a laptop screen sitting too close to a fire.. heh, but it was still usable.

          Link Preview Image
          E This user is from outside of this forum
          E This user is from outside of this forum
          eldalvini@discuss.tchncs.de
          wrote on last edited by
          #4

          I can't tell you what's wrong, but these shorted pads aren't it. They are added to the traces for extra thermal mass, a bit more or less solder doesn't hurt. If you look closely, all of the shorted pads are on the same trace of the PCB, so they would be connected anyways.

          J 1 Reply Last reply
          0
          • E eldalvini@discuss.tchncs.de

            I can't tell you what's wrong, but these shorted pads aren't it. They are added to the traces for extra thermal mass, a bit more or less solder doesn't hurt. If you look closely, all of the shorted pads are on the same trace of the PCB, so they would be connected anyways.

            J This user is from outside of this forum
            J This user is from outside of this forum
            jet@hackertalks.com
            wrote on last edited by
            #5

            Could it indicate something overheated on the other side of the board (the transformer)?

            1 Reply Last reply
            0

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