Toshiba Satelite C850 - No Power, Flashing LEDs

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  • ninadpurohit
    New Member
    • Oct 2021
    • 8
    • India
    #1

    Toshiba Satelite C850 - No Power, Flashing LEDs

    Hi,

    I am trying to fix this DK10FG board for a friend. It is not powering up.

    When I plug-in power adapter, its DC IN led and Caps lock start flashing. Even cpu fan gets on/off kick like flashing leds. No battery attached. Nothing happens on pressing power button. I checked the charger IC and it seems fine. (ACOK - 3.3v). Re-programmed the bios but no luck.

    I checked SIO chip NPCE885LA0DX and here's the reading

    19,46,76,88,115 | P3V3AL_R --> 3.3v
    102 | P3V3AL_EC --> 3.3v
    4 | P3V3S --> Fluctuates from 0.2v to 1.2v
    104 | P3V3AL_EC(VD) --> 3.3v
    82 | EC_PW_ON# --> Fluctuates from 0v to 3.18v
    83 | EC_CTL1 --> 0v
    110 | EC_CTL1 / DNBSWON --> 0.9v
    14 | ACPRESENT --> 0v
    101 | EC_CTL3 --> 0.9v
    95 | ACPRES --> 3.3v
    16 | PWR_WLED# --> 0v
    66 | CAPS_LED#_3 --> Flashing led
    85 | VCC_POR --> 2v to 3v
    64 | SA_PG / ACIN --> 0v
    63 | FAN_TACH1 --> 0.6v to 1.2v
    65 | DCIN_WLED --> Flashing led
    80 | LOW_BAT#_3 --> Fluctuates from 0v to 1.3v
    81 | FAN1_PWM --> Fluctuates from 0v to 1.3v
    99 | BATT_IN --> 2.3v
    108 | EC_BKLTEN --> 1.84v

    I suspect that the SIO is faulty because it is giving fluctauting EC_PW_ON. However I am not sure as I am not experienced at this.

    Any idea? What should I check next?
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