Chosen Solution
Hi all!! and Happy New Year! After a water damage in my Macbook air A1466, I lose my backlight I cleaned all the PCB board with alcohol, I checked the LCD connector´s pins and the fuse (they are ok) and I replaced the driver U9701. I reset the PRAM too. Everything seems ok and I have 22 Volts at the backlight input (PPVOUT_SW_LCDBKLT pins n.3 and 4 ) but the screen doesn´t have light. Please anyone could you give any idea how check what is happening? Thank in advanced for your help. Alex PD: The signal in a external monitor is perfect.
Make sure you have a no backlight issue (not no picture). Check the LCD cable for burnt pins or slightly melted plastic (check bottom of cable connector and make sure the gold dots are not dull). Make sure the backlight IC has been properly soldered (check the balls underneath to ensure they look right) and it is the right orientation. If this is fine, the issue will be with the screen. Heat and remove the silver bezel using a painting knife, be careful when sliding along the bottom part as it is easy to cut the 2 screen ribbons. Check the screen PCB, since the LCD connector and cable on this side can burn or could be liquid damaged. If this is the case, you will either have to solder an LCD connector on the screen PCB (be careful when heating) or replace the LCD panel/assembly. Plug in a test screen if you have one about
