I bought a dead T480s.

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Kaar3l
    Member
    • Dec 2014
    • 24
    • Estonia
    #1

    I bought a dead T480s.

    It seems that I have also hardware issue.
    I measured voltages and found that cpu ok, ram also 1v, bios chip gets 3v if powered on.
    What is missing is VCCGFXCORE_I
    So i checked the power supply that is PU404 output on PL406 and there were 0V. Then I checked PWM_1A with osilloscope that comes into the PU404 and it is 0v and when power is pressed it is stready 1v. Other power supply PWM-s jump up and down like PWM-s should.
    VCCGFXCORE_I has resistance 7.3ohm.

    Does the VCCGFXCORE_I need to be created on power up or later? What could I check?
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      GFXCORE is irrevalent for posting at this stage. It'll rise under load only

        Comment

        Previous template Next

        Related Topics

        Collapse
        • wangbreeze
          T480s random shutoff and then completely dead
          by wangbreeze
          Hello Gurus,

          I got a ThinkPad T480s. It was running fine but suddenly started random shut down. When it turned off, I had to push the reset pin to bring it back to life. But it got aggressively worse and became completely dead. No charging light, no life.

          I did some initial diagnostics with just the board (no battery, nothing attached, and no CMOS battery as well)

          Initial testing of the coil resistance seems to indicate no dead short. The only low resistance I measured was at PL701. It reads 38 ohms.
          charger gave - 20V - ok

          U101B
          ...
          02-03-2024, 04:57 PM
        • what_1282105
          Thinkpad t480s, completely dead after BIOS flash using CH341A programmer
          by what_1282105
          Following this guide (https://www.reddit.com/r/thinkpad/co...g_and_flashing) i re-flashed my t480s BIOS using an external (CH341A) programmer. The flash didnt work, so i reverted back to my BIOS backup successfully. The BIOS in the chip and the BIOS backup file are identical according to windows' file compare. The revert, however, didnt work: the only thing the computer does is flash the power button 3 times when AC power is connected. I've tried unplugging the CMOS battery, holding the reset button and holding down the power button- no signs of life....
          02-14-2025, 07:27 PM
        • Document Archive
          Lenovo ThinkPad T480s Notebook T Specification for Upgrade or Repair
          by Document Archive
          This specification for the Lenovo ThinkPad T480s 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 T480s boardview and T480s 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, 02:34 PM
        • Document Archive
          Lenovo ThinkPad T480s Notebook T Specification for Upgrade or Repair
          by Document Archive
          This specification for the Lenovo ThinkPad T480s 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 T480s boardview and T480s 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, 02:30 PM
        • Document Archive
          Lenovo ThinkPad T480s Notebook T Specification for Upgrade or Repair
          by Document Archive
          This specification for the Lenovo ThinkPad T480s 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 T480s boardview and T480s 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, 12:00 PM
        • Loading...
        • No more items.
        Working...