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MacBook backlight not working - display or backlight ic?

Hi All,

I have a problem with my backlight of my macbook air, when it suddenly stopped working. I sent to apple for diagnostic, which initially they assume it should be whether the logic board or the display, and after 4 days they said that it's the display and the cost to replace it would be around £450.

I did not sent for repair, but instead I sent it to iSmash (a repair shop in the UK) for diagnostic, and after running the diagnotic for a week, they said it is not the LCD that is broken, but the 'backlight ic' on the motherboard?

So I am wondering why is it quoted differently between these two premises and is 'backlight ic' an integrated part of the 'display'?

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@danj I need your feedback on this matter, to decide which repair should I go for

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You'll need to put on your Sherlock hat and do some sleuthing to figure out which person is correct here.

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To check the display, connect your system to an external monitor to see if you can see your desktop image on the external display, next take a flashlight and holding it on the screen of your system at an angle see if you can see the faint outlines of your desktop icons.

So if your external display is working and the flashlight test also lets you see your desktop you've isolated the problem down to the backlight circuit. Just to be sure we're on the right track here

OK, so here's the deal there is a chip on the logic board which converts the batteries (DC) power to the correct voltage the backlight LED's require. There is also a fuse link that can pop as well. Often these get damaged from getting the system wet so if you remember sitting your system down on a wet surface or having something spilled on it that could be what did you in here.

If you didn't get your systems wet:

While its possible a single LED or a string of LED's go down which would be more noticeable. A completely unlit screen often points to a burnt fuse link and the ribbon connection inside the lid could be damaged. Often I see a dented lid cover as the root cause here. Did you bang your system or sit something on the lid?

So if you open your bottom cover you can see if the inverter chip is bad it is often visibly burnt. Here is a picture of the logic board and the blue outlined chip is what you want to look at: Logic board. The display ribbon cable connects to the logic board just to the left of the Yellow marked chip at an angle. The fuse link is the little component just above the Yellow chip which has a P marked on it. Yours may have just a dot marked on it.

Also do you see any staining or corrosion? Just in case you forgot you got the system wet at some point. Look at the ribbon connectors solder joints as often I see corrosion there.

Are you able to isolate what happened?

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I did not check this myself. But i can see the screen from external monitor and if i flsh light to the logo. But i wonder why apple suggested me to change the display screen then? Weird

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I would pop the bottom cover off to inspect things. Do you see anything out of place?

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I am completely naive on this but i will pop by to iSmash to investigate about this. But surely it shouldnt be the display yeah? Cuz what apple told me is that they will replace the whole screen, as in take out the old one and put in a new one.

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They won't spend the effort taking apart the display to replace the screen if the cable is damaged within it, its just easier and safer to just replace the entire lid assembly.

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So Does that means that it makes sense to replace the backlight IC if the so-called-disply is damaged?

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the grey/black screen with the pointer is because the login screen is located in the display of your mac, you should try to reset your NVRAM/PRAM :

https://support.apple.com/en-us/HT204063

Then you will able to login since mirroring is the default option, good luck

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Thanks @ julian.r.berlin for the tip, currently taken apart to clean the heatsink and JTAG so will try once back together and see if any success to external display.

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Hi @julian.r.berlin - the reset trick worked and I can now output to an external display. Thanks

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great ! in my case I will open it and check the fuse, I hope is that ! since all the rest works fine

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@danj Hi Dan, I tried to edit my previous post to include pics as requested but it got deleted by the robot as spam, not really sure why. So trying again..

Spilt water Mac..turns on but faced with a black screen. Flashlight trick works and when I try an external display only, it shows a cursor on black screen. Logic board shows some rust? which I tried to clean with isopropyl but without avail. Couldn't spot any other signs of visible damage. Any thoughts would be appreciated.

Pics included this time:

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Thanks, Hannah

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So the fact the external display is showing a pointer we know the systems graphics is working but the CPU logic appears to have failed ;-{

You'll need to pop off the heat sink to clean under it as thats where your damage is likely. Also the JTAG port doesn't look good thats the connector near the Airport along the edge. A short with it could also mess you up.

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Thanks Dan @danj , I haven't gone as far as taking it all apart but can remove the heat sink. If I clean it, do I need to reapply some thermal paste before putting it back?

I will read into the JTAG port a little more based on what you have said as this is all new to me! Thanks.

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Where can I purchase this backlight IC please, and what specification should I use to purchase.

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@blakex - Best to create a fresh question with all of your details and why you think that's your issue, it may not be!

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Hi guys. I've been trying for weeks to fix my macbook air a1369 backlight. I bought a new screen and it still does not work.

I managed to test if it was the ic or not. It is not because I plugged a a1466 dysplay to my a1369 and it worked perfectly. I also plugged my new a1369 screen to the a1466 and it didn't work. So I think there must be a sensor or something that is not letting my backlight work.

Any ideas? Ive tried everything =/

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sharah さん、ありがとうございました!
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