w550s/t550 LCD screen replacement - brightness set at max.

Discussion in 'Lenovo' started by giggidy, Apr 5, 2015.

  1. adrian_sa

    adrian_sa Newbie

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    So I found a guy with a X250 and Ubuntu, he only needs to dump his EDID with edid-rw? How to later edit the file if he is using a HD panel and I want to install a FHD one?
     
  2. miomi

    miomi Newbie

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    It's better if you can find EDID dump from X250 FHD. You might still get away by overwriting the FHD panel's EDID with whitelist HD panel EDID dump, but I am not sure if there will be a negative impact with this.

    Btw, can you confirm X250 really has panel whitelist ? Because currently we only know models like T450, T450s, T550, and W550s that has panel whitelist.
     
  3. adrian_sa

    adrian_sa Newbie

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    The X250 does have a whitelist, I installed a 15.6" 1080p TN panel and brightness control didn't work. Bought mine X250 bare, just the case keyboard and motherboard.
     
  4. miomi

    miomi Newbie

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    Thank you for confirming. Shouldn't the X250 use 12.5" panel?

    So it seems almost all thinkpad models with intel core 5th gen (broadwell) has panel whitelist issue. The only broadwell models that needs to be confirmed are:
    X1 Carbon 3rd gen
    E450
    E550

    There are also amd variants of the E series: E455 and E555. But since they use amd chip, I think there is no whitelist on them.
     
    Last edited: Oct 9, 2017
  5. adrian_sa

    adrian_sa Newbie

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    That was just a quick test. Since I would have problems with a third-party panel anyway I ordered a BOE NV125FHM-N62 because of the better contrast. The panel looks amazing but of course the brightness control doesn't work. I bought a SOIC8 test clip but couldn't get a reliable dump of the BIOS. There is a thread on bios mods forum on how to disable the whitelist.
     
  6. 4est_v2

    4est_v2 Newbie

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    Can't we just cut the write protect pull-up pin of the EEPROM and then just flash it from linux?
    why won't that work?

    likely the pull-up is one of the small circuit o the pcb visible here
    http://postimg.org/image/yqoutrng7/

    so just receive the panel, cut the pull-up circuit, install in the notebook and flash it from linux
     
  7. adrian_sa

    adrian_sa Newbie

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    I flashed my BIOS successfully, I had to to use Ubuntu and flashrom for it to work.

    Poslano sa mog Redmi Note 3 koristeći Tapatalk
     

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