lenovo thinkpad t490 (20N2, 20N3) bios

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  • Stil86
    Member
    • Jun 2013
    • 15
    • Italy

    #61
    Hi everybody,
    when I power-on my Lenovo ThinkPad T490 it make's a single bip an a single blink of both power led and charge led and power-off again.
    I have read on multiple forum it can be a BIOS problem so I desolder it and I think I have a broken chip BIOS beacuse I try to read it multiple times but the result are always different and the programmer tells me that readed byte are different from aspected.
    On a famous site I have seen they sell already programmed BIOS chip but I remember someonr tell's me it is not a good idea to buy it.

    So, even if I buy a new blank BIOS chip, how can I find a BIOS to write ?

    If it is necessary I can attach a bios dump but is 32MB

    Model: T490
    Type: 20N3-S8C800
    S/N: PF-1BRFVK
    Mobo: NM-B901 Rev:1.0
    BIOS chip: W25Q256JV

    Thanks in advance

    Luca​

    Comment

    • malage2000
      New Member
      • Nov 2023
      • 3
      • Spain

      #62
      Hey! I have a Thinkpad T490 20N3 that boots up and I'm able to enter to BIOS but I get this message everytime while posting "Error sending End Of Post message to ME: HECI disabled, proceeding with boot!" and then laptop restarts and the cycle continues... I think that Intel ME got messed up while updating...I leave attached a photo of the message and the backed up BIOS binary flash file in case someone could clean it for me and hoping to revive the laptop! Thank you so much in advance
      Attached Files

      Comment

      • volinakis
        Badcaps Legend
        • Jan 2021
        • 2618
        • N/A

        #63
        Originally posted by malage2000
        Hey! I have a Thinkpad T490 20N3 that boots up and I'm able to enter to BIOS but I get this message everytime while posting "Error sending End Of Post message to ME: HECI disabled, proceeding with boot!" and then laptop restarts and the cycle continues... I think that Intel ME got messed up while updating...I leave attached a photo of the message and the backed up BIOS binary flash file in case someone could clean it for me and hoping to revive the laptop! Thank you so much in advance
        follow rules of this forum and post serial no.
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        Comment

        • malage2000
          New Member
          • Nov 2023
          • 3
          • Spain

          #64
          Originally posted by malage2000
          Hey! I have a Thinkpad T490 20N3 that boots up and I'm able to enter to BIOS but I get this message everytime while posting "Error sending End Of Post message to ME: HECI disabled, proceeding with boot!" and then laptop restarts and the cycle continues... I think that Intel ME got messed up while updating...I leave attached a photo of the message and the backed up BIOS binary flash file in case someone could clean it for me and hoping to revive the laptop! Thank you so much in advance
          Sorry, I forgot to post serial number, so here are the full details:

          Model: T490
          Type: 20N3-S7740Q
          S/N: PF-22173K
          Motherboard: NM-B901 Rev: 1.0​

          Comment

          • Stil86
            Member
            • Jun 2013
            • 15
            • Italy

            #65
            Originally posted by Stil86
            Hi everybody,
            when I power-on my Lenovo ThinkPad T490 it make's a single bip an a single blink of both power led and charge led and power-off again.
            I have read on multiple forum it can be a BIOS problem so I desolder it and I think I have a broken chip BIOS beacuse I try to read it multiple times but the result are always different and the programmer tells me that readed byte are different from aspected.
            On a famous site I have seen they sell already programmed BIOS chip but I remember someonr tell's me it is not a good idea to buy it.

            So, even if I buy a new blank BIOS chip, how can I find a BIOS to write ?

            If it is necessary I can attach a bios dump but is 32MB

            Model: T490
            Type: 20N3-S8C800
            S/N: PF-1BRFVK
            Mobo: NM-B901 Rev:1.0
            BIOS chip: W25Q256JV

            Thanks in advance

            Luca​
            Can someone "cook" me a bios for my lenovo ? Or should I try one of the BIOS posted here ?

            Thanks

            Comment

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            • Document Archive
              Lenovo ThinkPad T490 Notebook T Specification for Upgrade or Repair
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              This specification for the Lenovo ThinkPad T490 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the T490 boardview and T490 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for Lenovo ThinkPad...
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            • Document Archive
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              by Document Archive
              This specification for the Lenovo ThinkPad T490 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the T490 boardview and T490 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for Lenovo ThinkPad...
              09-06-2024, 03:30 PM
            • Document Archive
              Lenovo ThinkPad T490 Notebook T Specification for Upgrade or Repair
              by Document Archive
              This specification for the Lenovo ThinkPad T490 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the T490 boardview and T490 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for Lenovo ThinkPad...
              09-06-2024, 03:30 PM
            • Document Archive
              Lenovo ThinkPad T490 Notebook T Specification for Upgrade or Repair
              by Document Archive
              This specification for the Lenovo ThinkPad T490 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the T490 boardview and T490 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for Lenovo ThinkPad...
              09-06-2024, 03:30 PM
            • Document Archive
              Lenovo ThinkPad T490 Notebook T Specification for Upgrade or Repair
              by Document Archive
              This specification for the Lenovo ThinkPad T490 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the T490 boardview and T490 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for Lenovo ThinkPad...
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