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2.5 GHz dual-core Intel Core i5 processor (Turbo Boost up to 3.1 GHz) with 3 MB shared L3 cache.

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Hardware test shows error "4SNS/1/40000000: IO0R-1.550"

After the kernel_task process started taking up too much CPU(like 500-1000%) and the system hangs, this happens randomly. I ran the AHT and the error shows up

"4SNS/1/40000000: IO0R-1.550"

Figured out this is a sensor issue (SNS) but didn't find any resource mentioning the IO0R code.

Does Anyone know what this code refers to?

PS: My camera is also not working says "No video capture devices were found." in System info

Update (05/20/2016)

I think I found the issue. I opened up my macbook for cleaning up (lot of dust). And disconnected the iSight camera cable. Now the Hardware test passes without any error.

Beantwoord deze vraag Dit probleem heb ik ook

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Ja Nee
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sadly apple does not share the information

But SNS is a sensor issue

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It's likely a problem with one of your current sensing resistors on the board. These can be replaced. Requires some micro soldering.

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Ja Nee
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Thanks for answer. I thought this was current sensor issue but then I read carefully it says IOzeroR not IzerozeroR. Which seem like I/O port issue or something. I'm just guessing here though.

And if micro soldering solution is not in my reach, would this mean a logic board replacement?

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Not all the time

you could take it to apple and they will most likely tell you whats wrong and give you a quote

you can use this to your advantage as if its something silly that can be replaced with in 5-10 minutes that you are happy to do then you have saved yourself a bit of money

if it comes to a logic board replacement ( highly doubt) apple charge a fair price but you can get it worked on or buy a replacement and do it yourself

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goutham zal eeuwig dankbaar zijn.
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