Need help interpreting schematic of Lenovo B470 motherboard

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  • rddube
    Aspiring Expert
    • Jun 2013
    • 908
    • Canada
    #1

    Need help interpreting schematic of Lenovo B470 motherboard

    Hello everyone,

    OK, so here is my issue.

    This Lenovo B470 motherboard I am troubleshooting died and I identified it is the discrete Nvidia graphics chip that has lost it's ways!

    So I removed it and now I am trying to change this motherboard to use UMA graphics, but I am having an issue interpreting the attached diagram. I have a 10K resistor in at the R2013 position and another one at the R2012. R2010 and R2011 are empty.

    The motherboard starts, the fan spins but no display. It turns off by itself. I restart it and it does start but stays on with no display.

    I also tried removing the inductor PL9201, but that didn't work either.

    Trying to interpret that diagram to have the right combination in resistors.

    Any help would be appreciated. This diagram is on page 20 of the LA47 MB 10250-2 SCHEMATIC LENOVO B470 B470C schematics.

    Am also including a copy of the schematics. [MOD EDIT] Link to schematic https://www.badcaps.net/forum/troubl...92-lenovo-b470

    Click image for larger version Name: Capture d'écran 2024-08-12 154235.jpg Views: 0 Size: 28.3 KB ID: 3327923
    Last edited by rddube; 08-12-2024, 03:16 PM.
    Tags: None
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