MacBook Air A1466 Backlight comes on for less then 1 second.

[sikocan]

Hi all, I'm going crazy and can't figure this one out.
MacBook Air A1466
Board: 820-00165

Issue: Backlight comes on for a split second - then off. I can capture the 26V on the Oscilloscope before it disappears. Picture is fine and OS boots fine.

I've replaced the following:
4 Different screens
4 U7701
1 D7701
1 Q7706
1 Q7707

I've inspected LVDS connector - it looks good.

[mon2]

Re: MacBook Air A1466 Backlight comes on for less then 1 second.

Check the voltage to ground of the enable pin on the backlight IC. Does the backlight get disabled?

[sikocan]

Re: MacBook Air A1466 Backlight comes on for less then 1 second.

Voltages of interest:
PPVIN_S0SW_LCDBKLT 8.581
BKL_EN 2.845V
EDP_BKLT_PWM 0V
BKL_PWM 0V
PPHV_S0SW_LCDBKLT 8.568V

[sikocan]

Re: MacBook Air A1466 Backlight comes on for less then 1 second.

Fixed it.

https://www.facebook.com/groups/MacB...8493620631377/

I've just replaced the whole thing, flex and daughter charging port.

[sikocan]

Re: MacBook Air A1466 Backlight comes on for less then 1 second.

Because of smc_lid or hall sensor issue. Dcin board or/and dc in flex will be issue