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Ding Dong, the Dell is Dead! Black Screen

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  • 19-04-2020 5:25pm
    #1
    Philipx
    Registered Users Posts: 182 ✭✭


    Trying to diagnose this machine:

    Dell Optiplex 9020 AIO System Info

    Seems to boot & POST: fans & HDD spin up, DVD opens/closes, NumLock & CapsLock light up & power light on steady white.

    Power button flash codes (Optiplex 2012 to present)

    But screen is dead; I’ve shone a torch, but nothing visible.

    I’ve tried the following:
    • Attached external monitor via HDMI, nothing. Monitor detects that it's been connected, but nothing on screen.
    • I cannot attach a monitor with the VGA port as someone did previously & a pin is broken off & stuck in one of the holes. (PC was working normally despite this)
    • Removed & re-seated HDD, re-pasted CPU cooler & cleaned fans.
    • Removed RAM, correct led sequence for RAM error as per button flash code tables above.
    • Tried each stick individually and swapped between sockets. No error codes.
    • Temporarily removed CMOS battery.
    • Removed touch panel connector.

    PSU BIST is OK

    Display test seems ok: (Got all colours but no text screen)

    Web searches would seem to indicate that the motherboard is a goner, but I thought I’d throw it up here first, just in case someone has come across similar before or have any other suggestions.

    Thanks


Comments

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    #2
    SilverSideUp
    Registered Users Posts: 63 ✭✭SilverSideUp


    Have you checked that Intel HD Graphics option is selected in BIOS?


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    #3
    Philipx
    Registered Users Posts: 182 ✭✭Philipx


    SilverSideUp wrote: »
    Have you checked that Intel HD Graphics option is selected in BIOS?

    Can't get into bios, no screen!


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    #4
    smuggler.ie
    Registered Users Posts: 4,130 ✭✭✭smuggler.ie


    Philipx wrote: »
    Can't get into bios, no screen!
    Wonder if this would force system to display to external...

    ...strip apart, disconnect build-in screen from MoBo, assemble and try HDMI.
    Once at it, see if can remove stuck pin from VGA port.
    history of boards 2021




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    #5
    Philipx
    Registered Users Posts: 182 ✭✭Philipx


    smuggler.ie wrote: »
    Wonder if this would force system to display to external...

    ...strip apart, disconnect build-in screen from MoBo, assemble and try HDMI.
    Once at it, see if can remove stuck pin from VGA port.

    Worth a try, I'll give it a go this afternoon.

    I tried to get the pin out, but can't get enough purchase on it to lever or pull it out. Clipped corresponding pin on an old lead I had here to try & see if I could get it in sufficiently, but no joy.

    Cheers!


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    #6
    Philipx
    Registered Users Posts: 182 ✭✭Philipx


    Nope, no joy with screen disconnected. :(


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    #7
    smuggler.ie
    Registered Users Posts: 4,130 ✭✭✭smuggler.ie


    Philipx wrote: »
    Nope, no joy with screen disconnected. :(
    Not sure, but try...
    Switch the video image If your computer is attached to an external monitor, press [Fn] [F8] to switch the video image to the display.
    https://topics-cdn.dell.com/pdf/desk_laptop_ug_en-us.pdf#_OPENTOPIC_TOC_PROCESSING_d101e8819
    history of boards 2021




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    #8
    Philipx
    Registered Users Posts: 182 ✭✭Philipx


    First thing I tried when I initially tried the external monitor, cycled through all the F keys and also in combination with Alt, ctrl & shift keys. :p


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