Upgrade Asus X55C to FHD, possible? Informations inside

Discussion in 'Hardware Components and Aftermarket Upgrades' started by Chriz74, Dec 28, 2020.

  1. Tech Junky

    Tech Junky Notebook Evangelist

    Reputations:
    102
    Messages:
    406
    Likes Received:
    174
    Trophy Points:
    56
    So, it sounds like the LVDS cable either doesn't work or has a different pin out than the Laptop is providing. Saves you $20 for now.

    Since it's used there's a potential issue with the panel vs a new one.

    Cabling typically doesn't change much as to the pins / AWG of the physical wires. Of course the # of pins on either end can change to another # depending on the panel / MOBO.

    It could be the panel, could be the cable, could be the modified bios.

    Potentially might be the drivers even though they worked before / after replacement. I've had issues with adjusting the brightness on my new panel a couple of times and ran DDU to remove them completely and reinstall again and it fixes the issue. Not really sure why the driver replacement fixes the max brightness @ 50% or what causes it to stick at 50% or less but it works.

    With the diagonal refresh lines showing up in the photo it might be a bad refresh rate being selected causing some of the issue. Otherwise it's trial and error with another panel/cable until you find one that works.
     
  2. Chriz74

    Chriz74 Notebook Enthusiast

    Reputations:
    0
    Messages:
    15
    Likes Received:
    1
    Trophy Points:
    6
    The refresh rate for both screens is 60hz by specs. The connectors have different configurations:
    The 1366 is LVDS-40P1C6B-040B and the 1920 LVDS-40P2C6B-005A.
    No idea what it means but maybe it would be possible to reconfigure the original cable to match the laptop one that probably is not dual channel.
     
  3. Tech Junky

    Tech Junky Notebook Evangelist

    Reputations:
    102
    Messages:
    406
    Likes Received:
    174
    Trophy Points:
    56
    Well for the connectors it would appear one of them is configured for 1Channel (40P1C6B) and the other for 2Channel (40P2C6B) looking at the naming.

    So, the blurriness could be that there is insufficient bandwidth to push the full signal from the GPU to the display.

    In the single channel configuration the cable OEM may have simply not wired all of the pins saving them 2 cents.

    I will say this.... "where there is a will, there is a way" when it comes to reconfiguring cabling. There's all sorts of adapters and stuff that you can use in line or if you're handy with soldering you can do a DIY as well. The downside of a DIY is if you mess it up you need a backup cable to be functional again or keep trying to move the wires until it works again.

    When I was doing my panel swap there were 2 30 pin cable options in the service manual and a 40 pin option as well. Whether or not there was physically a difference in the wire layout on the 30pin options could be debated w/o physically examining them it's hard to say.

    Getting a 2 channel cable doesn't seem to be hard to find. Matching up both ends / length sometimes can be an issue.
     
  4. Chriz74

    Chriz74 Notebook Enthusiast

    Reputations:
    0
    Messages:
    15
    Likes Received:
    1
    Trophy Points:
    6
    Could look at the original cable wiring and add two cables to the working one also looking at panels datasheet to check diffs.
    ...
    it doesn't seem easy at all to modify a cable
     
    Last edited: Jan 26, 2021
Loading...

Share This Page