Asus SIO mess

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  • Joshua Toone
    Tech Tinkerer
    • Jun 2024
    • 4
    • South Africa

    #1

    Asus SIO mess

    Hi...So I have an Asus ROG Strix 15 aka GL503GE and the board is BKLB
    Anyway so the SIO was blown when someone disconnected the charger(strange) I checked all rails for shorts before I replaced the SIO with a blank chip
    I just got kbd lights(RGB rainbow) but nothing else, 3V and 5V are present but nothing else...
    Tried with 2 more blanks from different sellers
    I checked for voltages going to the SIO everything is good but no output from the SIO I am thinking it needs to be programmed
    I couldn't find the exact programmed chip but something that looks like it is from the same family FV503 on ebay
    Before I throw my money into the bin.Can someone please help? Is there any resistor CFG do I need to change to initiate Self Programming or something
    Last edited by Joshua Toone; 06-23-2025, 07:11 AM. Reason: typo on couldn't
  • Sephir0th
    Badcaps Legend
    • Oct 2020
    • 1262
    • Germany

    #2
    As seen in the attached picture, this EC gets its firmware from the Main BIOS flash IC, as typical with any other ASUS device.

    Another proof that the EC appears to work fine is, that S5_ON is a EC controlled signal, so the EC actually asserts this signal and "activates" 3V_S5/5V_S5 this way.

    Conclusion:
    something else is possibly wrong.

    Other problems before being in the position to conclude anything:
    - Basic overview of the board health (at the very least ALL secondary power rails which are easy accessible) is almost completely missing respectively no measurements shared
    - Something could be wrong with the soldering (no hq pictures of the job shared).
    - Device history is missing (Did someone else messed with the device before? Etc.)
    Attached Files
    FairRepair on YouTube

    Comment

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