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Backlight dead and something fried on the mainboard - Please help!

Hello,

i desperately hope to find some help here.

While changing the Display on a MacBook I accidently damaged and shorted two of the four cables coming from the mainboard to the inverter board. It took a few seconds for me to mention - long enough though to fry something on the mainboard resulting in the backlight not working anymore. I took a picture of it and uploaded it here:

http://img69.imageshack.us/img69/1904/ds...

You will notice the area on the right of the "BKLGHT" label burned. This picture is taken after cleaning the area with alcohol. It looked a lot worse before.

Could anybody please tell me how to fix this? Also knowing what kind of component was there before it fried or the schematics of that particular area would help a lot.

Thank you so much!

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

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Thanks for you answer!

I too think that it was one of the black ones because if it had been a fuse it would have blown but not melted, right?

I do have the needed soldering skills and equipment for SMD repair, i just need to know what type of element this is.

I shorted the lowest pin on the BKLGHT connector to ground, which imho is the power going to the inverter.

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Hi,

as I said, the white component was no fuse. It was a condensator. The black ones were fuses, they all had continuity without any resistance, so no resistors.

I bridged it and its working perfectly.

Thanks!

해당 답변은 도움이 되었습니까?

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Schematics for Apple logic boards are not easy to find. They wont let this information spread in the public domain cause they don't want you to repair your computer. They want you to buy a new logic board :-(

The white element under the shorted area is a microfuse protecting the inverter circuitry. Test it with a multimeter for continuity. There's a great possibility for a blown microfuse. I don't have a MacBook logic board to look at the missing IC but it seems to be one of the black ones you see over the shorted area.

I think that only an experimented tech can help for this kind of repair.

해당 답변은 도움이 되었습니까?

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Thanks for you answer! I too think that it was one of the black ones because if it had been a fuse it would have blown but not melted, right? I do have the needed soldering skills and equipment for SMD repair, i just need to know what type of element this is. I shorted the lowest pin on the BKLGHT connector to ground, which imho is the power going to the inverter.

Edit: After some testing I think the black ones are fuses and according to other areas on the mainbaord where the lighter ones are labeled C these must be condensators.

So maybe I should try jumpering the contacts where the missing part used to be?

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If you have a multimeter check the white one for continuity. The white one is a fuse. I would have no problem to bridge a blown fuse but the black IC may be there to reduce the voltage and if you bridge it you could do more damage to the logic board. Try to find a tech who knows electronic components values and could solder onboard the adequate part.

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