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No backlight troubleshooting help!

Hi guys I am looking for a little advice!

So I purchased a MacBook Pro 15” A1286 Mid 2009 which was very beaten up and the backlight didn’t work.

The first thing I did was disassemble the laptop, removed the glass (previously done and gorilla glued back on!) and screen and check the LVDS cable.

I could see two damaged pins on the cable (logic board side) so I ordered a new one which I tried yesterday. Unfortunately, I still get no backlight which was really disappointing!

What are my next steps? I don’t want to buy a new screen assembly if its the connector on the logic board. And I don’t want to replace that connector if its the screen itself!

I am pretty much at my budget for this project, having also replaced the keyboard and SSD so I wanted a little advice.

What checks can I do to really narrow down the problem once and for all?

To add to that, I tested the voltage on the backlight fuse to ground, one side was 12v, the other was nothing.

I saw a post that said to bridge it with tweezers to see if the light came on. All I got was a puff of smoke from the board and the fuse blew / blew even more!

Everything else seems to be working, still getting LCD working, just no backlight.

So now I have a 100% dead fuse, and I’m non the wiser! What can I do?? :(

Cheers guys

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@akiwi92 for now you definitely want to stop applying jumpers to components :-) Post some good pictures of your logic board (both sides) as well as the LVDS connector from your LCD (both sides) with your question. Let us see what the display connector looks like as well as the area around your LED driver. Hope you got a couple of more fuses since you may need those. Did you try to power it on with your LCD disconnected? 기존 질문에 이미지 추가하기 In ohm mode, what does your multimeter display when you place the red probe on the broken part of the fuse (that originally did not show power) and the black probe to a good ground?

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Not good ;-{ When you over-ride a fuse you run the risk of causing deeper damage, which sounds like what happened.

I would see if an external monitor works and you will likely need to find someone with the needed skills to fix your logic board.

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I know, I’m learning on the job here so lesson learnt.

External monitor still works fine, as does the LCD, just no backlight.

Are there points on the board I can check with a multimeter to see what is damaged? As it obviously wasn’t just a dead fuse in the first place :(

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The LVDS connector likely has a short which is what did you in and the backlight LED driver is now blown.

You'll need the schematics and boardview drawings and the skills to read them.

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Thanks, have schematics and board view already after an hour of trying to find the fuse that’s what helped me! Any points I should be checking?

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Review pages 84 'LCD Backlight Driver & 85 'LCD Backlight Support'

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@danj Thanks! I now have a proper multimeter, now I know the fuse is blown for a fact. How can I test what the original problem was? Do I have to replace the fuse first?

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