A1502 2015 screen

[Mamdouh]

i have a 2015 A1502 screen thats stuck at max brightness bklt pwm is changing on the board as i lower and raise the brightness i tried changing the lvds cable and same thing has this happend with anyone or is this just a bad screen

 

[2informaticos]

Are you talking about EDP_BKLT_PWM, or BKLT_PWM_KEYB?
Backlight control comes from LCD, through I2C _BKLT bus.
Try known good LCD assembly.

Be sure R7050-53 are all good.
Also check voltage and diode mode on SCL/SDA lines w/ and w/o LCD connected.