Help with identifying components on logic board

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iMac Intel 21.5" EMC 2544

Model A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Steve Schlafly @steveschlafly

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Posted: Dec 1, 2015

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Help with identifying components on logic board

I don't know how this happen as the cables only go one way but I replaced the Glass and LCD and when I turned it on I got a black screen and smelt a chip burning and pulled the power. the small black chip is right near the cable that powers the LCD. I'm able to use a thunderbolt to HDMI adapter to get a display on my TV.

Issues:

1. No Display

2. Burnt chip

3. Fan running at 100%

4. "kernel_Task" running at 350-400% making the OS extremely slow.

Attached is the my logic board without the burnt chip. The red arrow in the bottom right shows the small black chip the was fried. Any help would be appreciated.

thank you,

Steve

Logic Board showing chip

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oldturkey03 @oldturkey03

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Posted: Dec 1, 2015

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Steve Schlafly that is reference designator L9100 which is a 250ohm filter bead. Most likely one from here will fit. I do not have the package size, so you would have to measure the dimensions of the component yourself.

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Thank you oldturkey03 for the detailed reply. Knowing this filter bead cost less than $1 and all the work would be labor what would someone charge for such a repair if it's even possible to fix? Here's a picture of my board. Do you think someone with experience can replace that bead?

thank you,

Steve

Burnt Bead

Dec 2, 2015 by Steve Schlafly

Since you have the board out it should be a pretty straight forward soldering job. Any decent electronic repair shop should be able to handle this. Cost is of course depending on local rate etc. No more than ~$50-$60USD. Concern here is why it blew in the first place. Diagnostics for these boards is a bit more expensive.

Dec 2, 2015 by oldturkey03

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Thank you oldturkey03 for the detailed reply. Knowing this filter bead cost less than $1 and all the work would be labor what would someone charge for such a repair if it's even possible to fix? Here's a picture of my board. Do you think someone with experience can replace that bead?

thank you,

Steve

Burnt Bead — Steve Schlafly
Since you have the board out it should be a pretty straight forward soldering job. Any decent electronic repair shop should be able to handle this. Cost is of course depending on local rate etc. No more than ~$50-$60USD. Concern here is why it blew in the first place. Diagnostics for these boards is a bit more expensive. — oldturkey03