Asus laptop EC/SIO chip replacement

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  • ebugs
    New Member
    • Aug 2024
    • 1
    • Myanmar
    #1

    Asus laptop EC/SIO chip replacement

    Asus Vivobook 15 (board X513ea R2.0) gone dead when user plugged an iPhone cable into the USB-C port during boot. Now there's no LED light, no power at all. I checked all MOSFETs and capacitors, no shorts found. The board only has 3.3V and 5V present, no other voltages.

    I injected 3.3V into the EC chip power rail (ITE IT5125VG 128), and it draws 80mA, while the 3.3V LDO chip RT8249C has a max output of 100mA. I checked the boardview and found there are only two chips on this 3.3V rail, EC and Realtek audio chip. So I think EC could be the problem.

    I found the EC chip on Taobao for 40 Yuan (~$6), but there are two options: one with firmware and one empty.
    My questions are:

    1. Is it true that Asus laptop auto flash the EC firmware itself after replacing the chip?

    2. Can I use empty EC chip because I'm afraid of incompatible or wrong firmware programmed EC?
    I mean I'm going to order empty EC chip and install and let the laptop flash required firmware itself, is this correct?

    Thanks for any help.
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