hello,
i am working on macbook pro 820-00840 no backlight.
there is no water damage indication nor corrosion.
measurements:
F8400 = 13V on both sides
PPVIN_S0SW_LCDBKLT = 0V
LCDBKLT_EB_L = 13V
PPVIN_S0SW_LCDBKLT_R = 13V
PPVIN_SW_LCDBKLT_SW = 0.012V
PPVOUT_S0_LCDBKLT = 0V
LCDBKLT_SW = 0.019V
LCDBKLT_FET_DRV_R = 0V
PP5V_S0_BKLT_D = 5.1V
LCDBKLT_FB = 0V
no short to ground on backlight caps
already change U8400, Q8401, D8410 and Q8400 3 times but no progress.
already check the pull up resistor all correct in value.
really confuse now..
any suggestion would be appreciated.
thanks before
i am working on macbook pro 820-00840 no backlight.
there is no water damage indication nor corrosion.
measurements:
F8400 = 13V on both sides
PPVIN_S0SW_LCDBKLT = 0V
LCDBKLT_EB_L = 13V
PPVIN_S0SW_LCDBKLT_R = 13V
PPVIN_SW_LCDBKLT_SW = 0.012V
PPVOUT_S0_LCDBKLT = 0V
LCDBKLT_SW = 0.019V
LCDBKLT_FET_DRV_R = 0V
PP5V_S0_BKLT_D = 5.1V
LCDBKLT_FB = 0V
no short to ground on backlight caps
already change U8400, Q8401, D8410 and Q8400 3 times but no progress.
already check the pull up resistor all correct in value.
really confuse now..
any suggestion would be appreciated.
thanks before
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