820-3437 missing backlight

[MDY]

820-3437 missing backlight
Liquid damage arround lvds. I replaced LVDS connector and now I have 39.6V at lvds pin 3,4. I can see blinking folder using lantern.
39.6V is enought? This mean U7701 (LP8550) is working well?

 

[dukefawks]

Check BKL_PWM. Is LCD cable not burned?

 

[MDY]

LCD cable looks pretty good. Can I connect another screen to test? I dont have macbook air screen for 2013-2014 year. I have Air 2012 and MBP 2012.

 

[dukefawks]

2012 Air assembly should work. Read my question again and check that too. LCD must be plugged when measuring anything.

 

[MDY]

I checked at R7704 and I have 3.3V