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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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What is this component? And how to fix?

Hi all.

So I am trying to repair this iMac for the friend of a friend. Here are the details.

The guy opened it up a while ago to clean out the fans and stuff, plugged everything back in (the screen) and when he turned it back on, the screen came on, but was only black, the Mac bong/chime sounded, and he smelt something burning. He didn’t know what to do, so it sat there for a while. Then he hears from my friend that I work on PCs and some Macs, and asks me to have a look.

I get the mac, plug it in, the chime sounds, screen comes on (powered) but only shows black. I know the logic board is working (at least for the most part) because when I reset the PRAM i get the chime as many times as I want, and the PRAM is resetting, no errors.

So i open her up, and sure enough, there is some heat damage around the LVDS port. I see the reason, the guy didn’t seat the cable in properly when he put it back together the first time. The damage doesn’t seem to be too bad. But it does look like a capacitor/fuse/”filter?” has burn to the point where the solder has melted, and it fell off. (pictures attached) And one that seems to have a little heat damage, but is still in place.

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If you guys could help me out that would be great! What is the component? (is it a fuse, a capacitor etc) and how should i go about fixing it?

And yes, I did try plugging the screen in again with all of the cables correctly seated. and all was the same.


Thank you all in advance for your help!!! :-)

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Ja Nee
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It is a Microcontroller, I don’t have experience fixing this part of the iMac, but I do however know how to remove it. You have to get a soldering iron and desolder the microcontroller from it.

door

Thank you so much!

Do you mean the one that fell off?

If so, is there anything I need to bear in mind when installing a new one?

Thanks again. :-)

door

@dat_one_boi - It's not a micro-controller! It is a MOSFET

door

No, if it fell off, it is just better to buy a new microcontroller. Trying to re-solder it is too hard and you might melt the copper lanes around it.

door

@danj Thank you. Which one are you referring to? :-) The one still attached to the board? or the missing one?

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Opties

Ouch! Sorry to tell you the display cable was inserted backwards!

This damage is quite severe some of the copper traces have been damaged besides the visible damaged parts.

Block Image

So you'll need to find someone else who has the skills to fix the logic board or get a replacement logic board.

This person owes you for their mistake!

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Ja Nee
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Hi there, Thank you for your reply.

The cable didn't seem to be in backwards when I first opened her up. (Unless I honestly didnt notice. Then shame on me haha) Could the same damage simply be from the bad connection of the cable not inserted properly?

Thanks again! :-)

door

If you slid the cable in while the system was powered you could have shorted pins. You would then need to check the connector & cable for damage as well.

You have all of the components listed in the image I posted. But as I said you have more damage than the components here.

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Nathanael zal eeuwig dankbaar zijn.
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