If the screen is dark (no backlight, not lighting the screen), check the following;
1. Check the screen cable and screen connector for any burnt pins/melted plastic
2. Check continuity on backlight fuse (will have a little "p" or "n" on it, near the screen connector
3. Check voltage on the black diode at the top of the board, near the screen connector, above the coil.
If it is 1, replace the screen cable and LCD connector. If it is 2, replace the fuse (but check resistance to ground before turning it on, otherwise it will blow again). If it is 3, remove the backlight IC, check continuity from here to the diode, run a wire and fit new chip if no continuity or just replace chip if there is continuity.
If you think the spillage may have gone on the screen a bit, the screen PCB itself is likely toast.
Try the above. If you are not comfortable carrying out logic board repairs, I would recommend sending it somewhere at this point, since all of the above will need things to be soldered.
4 Comments
Is it not booting, or is the screen dark (not lighting up)?
by Reece
Hello, I would say to start I would do a teardown of the mac and look for any known issues. Can you please post photos of the following and tag me and I will be back to see if I can spot anything.
Please post the following;
- The Logic Board
- HDD/SSD Connector
- Screen Connector Pins (Found On Logic Board
- Picture of logic board when laptop is powered on (Please be safe while doing this)
Thanks and I hope to hear from you soon.
by Keegan Bourque
The screen is dark, Reece
I unplugged the battery and plugged it back in, and it still doesn't boot up.
I have an identical Macbook Air.
Would this be a correct procedure?
1. Switch the battery of the 2 laptops and see if this fixes the problem.
2. Switch the Logic Board if it fixes the problem.
3. Next step please?
Thanks in advance,
Tom
by Tom Garcia
@keeganbourque
I took the pictures. How do I get them to you?
Thanks,
Tom
by Tom Garcia