Dell P2317H - backlight, no display

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  • spleenharvester
    Badcaps Veteran
    • Mar 2010
    • 899
    • UK
    #1

    Dell P2317H - backlight, no display

    Hi friends, got this one basically for free (sold as working but refunded) so interested to have a play about with it.


    It powers on but to a black (backlit) screen. Every 10 seconds or so the screen goes dark (power LED stays lit) then comes back on to a black screen again. Rinse and repeat. No response to OSD controls or to input being plugged in. USB ports have power and the display is detected properly and doesn't disconnect if HDMI is plugged into my laptop so it seems to be at least partially alive.


    Disassembled but can't find anything obvious wrong. No bad caps, burned components, etc. Been a while since I've been at this kind of repair, life got the better of me for a while, so any pointers on where to start looking would be appreciated!



    EDIT - Images here: https://imgur.com/a/Cjkhd0O the panel is a LM230WF9(SL)(A1)
    Last edited by spleenharvester; 07-10-2023, 07:35 AM.
    Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD
    Tags: None
    • spleenharvester
      Badcaps Veteran
      • Mar 2010
      • 899
      • UK
      #2
      Re: Dell P2317H - backlight, no display

      Just checked and the LM230WF9 is getting +5V and +3.3V and the controller board is getting +5V, so it seems like this is a signal transmission issue rather than power. The computer properly detects it and everything, shows P2317H @ 1080p60. I am thinking maybe ribbon cable as it was working when the seller tested it but perhaps was damaged in transit.


      EDIT (again): Just tested continuity of the 30 pins on the LVDS cable, all are fine.



      EDIT: Did some frankensteining with another monitor with a 30-pin x 2 ch LVDS, the fault is on the Dell's panel - any ideas where to look? I imagine this is going in the trash though!
      Last edited by spleenharvester; 07-10-2023, 08:44 AM.
      Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

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        • spleenharvester
          Badcaps Veteran
          • Mar 2010
          • 899
          • UK
          #3
          Re: Dell P2317H - backlight, no display

          Final update, it appears to be the SM4047 IC on the panel... after a minute or so of power it gets extremely hot. Replacing QFN is pretty much beyond my abilities (thanks to a tremor) so I'm just going to scrap it.
          Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

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