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    Replacement Screen not Working

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by ssn713, Feb 12, 2011.

  1. ssn713

    ssn713 Newbie

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    I purchased a replacment screen for my daughter's laptop (Toshiba L645D-S4025) from a third party vendor. After completing the install, I started it up and.... nothing (i.e. black screen). After doing a little trouble shooting, I discovered that if I started it up with the old (broken) screen connected and then swapped out screens with the power on it works fine. Unfortunately, if I shut down and restart with the new one installed, the screen never powers up. It almost seems like the computer is not recognizing the new monitor when it starts up.

    Any ideas on how to fix this?

    The replacement screen is Samsung LTN140AT02.
     
    ssn713, Feb 12, 2011
    #1
  2. Tsunade_Hime

    Tsunade_Hime such bacon. wow

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    Can you pipe out the display to an external monitor? If you can then perhaps your new screen is defective (not that uncommon). If you can't you may have a GPU/motherboard/RAM issue.
     
    Tsunade_Hime, Feb 12, 2011
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  3. ssn713

    ssn713 Newbie

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    Using an external CRT currently (very uncool) and like I said the new screen works if I do a hot swap so I don't think its a hardware issue on my end. I'm on the hook for shipping both ways so I'd rather not send it back for a new one just to have the same problem if its a compatibility issue. Not to mention my daughter saved up her allowance for the replacement and $15 each way for shipping will add up fast.
     
    ssn713, Feb 12, 2011
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  4. Tsunade_Hime

    Tsunade_Hime such bacon. wow

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    Very odd, never seen that before. Have you updated your video card drivers to the latest one?
     
    Tsunade_Hime, Feb 12, 2011
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  5. ssn713

    ssn713 Newbie

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    The extent of the tech support I received consisted of telling me to make sure my bios and drivers for my video card were up-to-date (they are).

    Is it worth the $30 round trip to try the exchange for a new screen or is there anything else I can try on my end?
     
    ssn713, Feb 12, 2011
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  6. TwiztidKidd

    TwiztidKidd Notebook Evangelist

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    Is there any way you can post a close up picture of each display, the one you purchased and the original (broken) one... including the harness? This display doesn't use an inverter so it's really simple to swap however I don't recommend hot-swapping it.
     
    TwiztidKidd, Feb 12, 2011
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  7. Terry Kennedy

    Terry Kennedy Notebook Consultant

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    I don't know who builds the Toshiba or what BIOS brand is in use, but on the Dell Studio 155x (built by Quanta) the Phoenix/Dell BIOS checks the display ID and won't use one that doesn't have the correct (Dell) EDID. The Dell panel diagnostic (hold down D key while pressing power button) does operate the non-Dell panel properly, but the BIOS doesn't recognize it. You may have a similar problem.

    It might be helpful to run the edidw2k.exe program (Google for it) and post the results from both panels here. That might indicate something useful with the EDID data.
     
    Terry Kennedy, Feb 13, 2011
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  8. ssn713

    ssn713 Newbie

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    Here's the results with the new screen installed after a hot swap (its improperly identifying the screen as the AUO brand screen that was dis-connected after start-up):
    Here's the results with the old screen (broken AUO brand) installed and an external CRT attached:
     
    ssn713, Feb 13, 2011
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  9. Terry Kennedy

    Terry Kennedy Notebook Consultant

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    Ok. Since the EDID data wasn't updated when you hot-swapped the display, we can't tell what is different between the old one and new one. Sorry.
     
    Terry Kennedy, Feb 13, 2011
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