For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
my motherboard part number is 820-3787-a. 2 boards. in 1 power on cpu and graphic working but no display . no dim display either.
In second board dim display. I am unable to locate the fault because i dont have much idea about the flow of signals. How complete dislpay works pls guide . If you have proper video or in writing how much will it cost.? Thanks
Starting with Retina displays, Apple introduced a complex backlight control.
PCH sends backlight PWM adjust signal to display, which resend it to backlight circuit through I2C bus.
Always image must be activaed before backlight appears; this avoids image flickers, or artifacts.