820-2850 backlight wont come back if mac is on and not used for a while


New member
I have this board, backlight is OK while computer is on, but if you don't use it for like about 5-10, screen turns dim, this is normal. But when you hit any key or anything, backlight wont come back, although the screen is working and computer on. Any help?


Never seen that before. First inspect for corrosion of course. Then measure voltages after this has occurred, see if BKL_EN is still there and see what the output is on the LCD connector.