Mid 2010 Model A1278 / 2.4 or 2.66 GHz Core 2 Duo processor

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Apple hardware test Failure code...

After running a aht it gives an error : 4SNS/1/40000001: VP0R-0.000

what is the exact problem in this logic board. System is very slow . i already dismantle 3-4 times some time after assembly it works for little time means working until restart. after restart it again giving same problem.

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If i Plug the Charger in then the laptop works fine no problem. while on charger also AHT gives same error . What to do??

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I see two possibilities; use it as is, or, replace the logic board.

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What did you do in the end ? I have exact same problem. Dont no weather to get fixed or not ?

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Run the extended version of the Apple Hardware Test. Sometimes you will get an error if you run the quick version, and it may be something of a false positive. Some have found doing an SMC reset 3 or 4X can eliminate the error (note: a work around not a fix). If it is indeed a logic board error it points to a sensor(s) failing, VPOR might be VGC(VPU) related. You'll probably need a new logic board, AFAIK sensors as well as the VGC are soldered to the logic board which pretty much makes them non-DIY repairs, as soldering on logic boards are not for amateurs.

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i already done SMC or PRAM, can you locate the specific sensor which creating this problem ? thanx in advance

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Nope - looked but "best guess" was all I could offer.

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it was the error of sensor on the logic board . i replaced the logic board

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