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    Toshiba Screen Resolution Upgrade

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by Kesmar, Dec 24, 2015.

  1. Kesmar

    Kesmar Notebook Enthusiast

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    Hi, i have a P855-34k, and have a HD screen, this laptop have a model with full hd 3d screen, i try to upgrade my screen with a FullHD screen, the screen on my pc is a LP156WH4 i buy the lvds cable of the p855 with fullhdhd(and 3d) and i buy a B156HW v1, the pc recognize fullhd resolution but appear grennish and very illegible.
    Why? My motherboard have a lvds dual channel
    Is a incompatibile screen? If i buy the screen of 3D version will work?(only the fullhd resolution because i think mi laptop dont have a 3d chip)
    Please Help
     
    Kesmar, Dec 24, 2015
    #1
  2. t456

    t456 1977-09-05, 12:56:00 UTC

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    3D panel would've worked as well, but so should the V1:

    [​IMG]

    That is, provided it really is a dual channel cable and it's socketed firmly. Make a photo of the cable and try re-seating the cable; the connection is somewhat picky.
     
    t456, Dec 24, 2015
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  3. Kesmar

    Kesmar Notebook Enthusiast

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    I tested with b156hw02 v1 but it didn't work because,as I already said, the screen becomes green. Is the b156hw01 different from the w02? If I bought the original toshiba 3d screen, would it work?
    The cable is for sure dual channel.
     
    Kesmar, Dec 24, 2015
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  4. t456

    t456 1977-09-05, 12:56:00 UTC

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    Doesn't matter; identical configuration. Either the panel or cable is defective or it is merely a poor connection. Might get an adapter board to check the lcd (or run it on a different system).

    And did you make a visual confirmation that it's a dual channel, i.e., by counting the individual wires? The label alone is not definitive proof.
     
    t456, Dec 24, 2015
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  5. Kesmar

    Kesmar Notebook Enthusiast

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    i check the cable and have all pin connected, is possibile my motherboard have a disabled component for full-hd?
    i check the scheme and i found this pics:
    [​IMG]
    [​IMG]

    and my motherboard have this disconnected,i check with tester and the pin disconected are a gnd, i try to connect the pin but anytingh change
    [​IMG]
    please help
     
    Kesmar, Dec 27, 2015
    #5
  6. t456

    t456 1977-09-05, 12:56:00 UTC

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    It's possible. Can you upload the full schematic somewhere? Pins #23-#30 take care of the secondary lvds channel, so measuring power there would be definitive proof the board is 900p+ capable, at least. Rather tricky, though; easy to cause a short.

    Perhaps the issue is more to do with software and not so much hardware. Try a bios flash (or reset) and re-install video drivers.
     
    t456, Dec 27, 2015
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  7. Kesmar

    Kesmar Notebook Enthusiast

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    Kesmar, Dec 28, 2015
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  8. t456

    t456 1977-09-05, 12:56:00 UTC

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    Toshiba isn't known for that, no. Just in case; can you upload the bios?

    The spec. sheet only mentions 3D LVDS or HD eDP options. Can you make a photo of the reverse side as well? You'll want to check a few capacitors; C890, C891, C912, C913, C914 and C915. And see if you can find an 'L60'; with a regular fhd panel those pins expect a ground, but the 3D uses them for the active shutter glasses. Perhaps it's merely a matter of shorting #32 and #33 to ground or, indeed, buying a 3D panel, after all. Mind that you do not need a 3D-capable gpu to run the panel; it will run fine, except as a regular display.

    [​IMG]
     
    t456, Dec 28, 2015
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  9. Kesmar

    Kesmar Notebook Enthusiast

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    Kesmar, Dec 30, 2015
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  10. t456

    t456 1977-09-05, 12:56:00 UTC

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    No white-listing in the bios, at least. It does contain vbioses for the GT 525M and the generic GK107M chip, if you have either gpu then there should be no problem running fhd (or even 3D, if it's the 525M).

    Make a photo of the pcb's reverse side and also of the green-ish screen itself. Perhaps it's more of a timing issue then incompatibility ... what refresh rate is it running at?
     
    t456, Jan 1, 2016
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  11. Kesmar

    Kesmar Notebook Enthusiast

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    Ok, now i change the b156hw with original 3D toshiba screen compatible, when the screen arrive i test again and if not work i make the photos,thanks very much i still hope in your help if will not work ;)
     
    Kesmar, Jan 3, 2016
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  12. Kesmar

    Kesmar Notebook Enthusiast

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    the 3d screen not work :(, only turn on but show black screen, tomorrow i test with connect the disconnected pins.
     
    Kesmar, Jan 15, 2016
    #12