a1708 no backlight

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  • Arshad alam4659
    Senior Member
    • Aug 2020
    • 156
    • India
    #1

    a1708 no backlight

    a1708 820-00840-a no backlight no short no liquid damage i checked some voltage

    PPVOUT_S0_LCDBKLT=12.6v
    PP5V_S0_BKLT_A=5v
    PP5V_S0_BKLT_D=5v
    BKLT_SCL=4.5v
    BKLT_SDA=4.4v
    BKLT_EN_R=3.3v
    BKLT_PWM_KEYB=0v
    ISNS_LCDBKLT_N=13.04v
    ISNS_LCDBKLT_P=1303v
    BKLT_SD=9v
    BKLT_SENSE_OUT=0v
    LCDBKLT_FB=10.95v
    LCDBKLT_SW0.106v
    i changed u8400 and screen and small screen cable but same condition and also check resistor near u8400 all ok what i am missing someone help






    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13974
      • Canada
      #2
      Are you sure you have video? Test with torch light. Keycaps led toggles?

      https://boards.rossmanngroup.com/thr...cklight.61666/

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