120hz screen upgrade problem - Blank screen

Discussion in 'Alienware 17 and M17x' started by Hirosake, Dec 22, 2019.

  1. Hirosake

    Hirosake Notebook Consultant

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    Hello Power Rangers - please help if you can.

    As title said, I bought aliexpress screen and cable. Following @MogRules excellent guide.
    I've reread guide but i cant see where this is falling down.

    Screen and cable installed, no post errors, if I put boot drive in it boots to windows I think (can see wifi and hdd activity leds flashing like christmas tree).

    I have a back light on screen, just absolutely nothing displayed.
    Plug old lvds cable into new screen gives 8 beep post error.
    Plug new EDP cable into old screen gives 8 beep post error. (yes i saw the brick caution, Im typing back on old screen and lvds cable)

    Anyone have ideas of testing cable or screen? Maybe i bought wrong part?

    Thank you for the insight

    https://www.aliexpress.com/item/32825226292.html?spm=a2g0s.12269583.0.0.437c8c8aSuP5hr


    IMG_20191222_123213.jpg


    2.png Ordered parts actually says
    17.3" 3D 120HZ LED LCD SCREEN LTN173HT02-D01 D02 for DELL Alienware M17x 17R 7720
     
  2. Hirosake

    Hirosake Notebook Consultant

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    IMG_20191222_145124.jpg

    EDIT: I have used magnifier and checked pins/connectors, reseated, all look new and ok. I have not checked continuity, my probes are way too big.

    I changed bios settings from PEG to auto (just for giggles) A14+ unlocked

    Only thing I got left to try is put my old 860m card. Give it a bash tomorrow.
     
    Last edited: Dec 22, 2019
  3. Hirosake

    Hirosake Notebook Consultant

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    So I couldnt sleep thinking about this and no work tomorrow...so I put old 860m card and new screen and guess what.....beautiful colours! 860m works great. Why the hell not my 980m? Im sure I read that 980m and 120hz was ok???
     
  4. Clamibot

    Clamibot Notebook Consultant

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    So the 860m works fine but not the 980m? Seems to me that you have legacy support enabled under the boot mode option in the BIOS. Make sure the boot mode is set to pure UEFI. Pascal cards (1000 series) will present you with a glorious black screen should you enable legacy support under the boot mode option since they do not support legacy boot mode, and I think it's the same case with the Maxwell cards (900 series).
     
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  5. Hirosake

    Hirosake Notebook Consultant

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    Hi Clamibot, Thanks for reply.
    Yes the 860m card worked with 120hz screen. Booted no issues. The 980m boots, but nothing can be seen. (No errors though)
    I dont have legacy mode enabled. I was reading and reading, seems some people had problems with this card (about 5 years ago) a bit hit and miss.

    IMG_20191223_094833.jpg
     
  6. Hirosake

    Hirosake Notebook Consultant

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  7. Hirosake

    Hirosake Notebook Consultant

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    ok....Im stumped.

    Has anyone any idea at all?...I will research the wildest ideas


    EDIT: Does anyone know a good source of vbios roms?...specifically for nvidia...980m?
    Techinferno wont let me download...Im not cool enough to be "in"
    I tried a rom from Eurocom...wouldnt flash
    Couple from techpowerup...no fix but flashed ok

    Thank you
     
    Last edited: Dec 24, 2019
  8. Clamibot

    Clamibot Notebook Consultant

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    One more thing you could try since there are no beep error codes. This may or may not work, but it's an idea.

    In the past when I would get a black screen with no error codes, I'd just do a BIOS reset and then everything would be fine. If you don't know how to do this, simply remove all the memory installed in your system and turn it on. Let it beep until it shuts off, then quickly insert a ram module before it turns itself back on. See if that yields any results.
     
  9. Hirosake

    Hirosake Notebook Consultant

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    Clami...its worth a try, thank you mate.

    860m.png

    So here is my 860m with the 120hz screen
    So..
    I know the 120Hz screen and EDP cable work
    I know the pc boots in uefi in peg mode
    I know the motherboard is ok and probably the cpu. (I might swap my old 4710mq just to check)

    I checked the chip on 980m card, it looks legit!?!?!...I havent got a schematic and cant find one so I cant check any components on the board, but everything looks ok. Probably its just a dud card.


    Only thing left that I can think to try is bios and vbios settings.

    If the 860m had more than 2Gig of RAM Id just stick with that. Oh well
    :)
     
  10. Hirosake

    Hirosake Notebook Consultant

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    Ok an update Power Rangers!
    I never got the LTN173HT02-D02 to work with 980m card.
    On a hope and prayer i bought a N173HHE-G32 from aliexpress.
    Works great! 120hz 980m.png

    Some light modding to the old frame and bezel and its in business...seems a little dark, but im still adjusting.

    Not sure what the deal is with LTN173HT02....edid? All i know is it worked with 860m but not 980m. No error beeps. Same edp cable, maybe just a bad connector.
     
    Last edited: Jan 24, 2020
    Maxware79, IVHOTEP and M18x-oldie like this.
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