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2011년 상반기 모델, A1278 / 2.3 GHz i5 또는 2.7 GHz i7 프로세서.

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boot fail, fan spin, black display

fixing for a friends

he say to me that is dropped and after gone on sleep, never come back and won't boot anymore.

when u press power button, stars with fan spin and black screen and no more just gradual fan acceleration

i tried:

other magsafe = same

external monitor = same

i try with no ram = no beep

no battery= same

no hd = same

im on 99% logic board issue (seems like the classical gpu failure, but strange it was dropped..)

any suggestions are appreciate

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It's not passing the initial POST checks if it is not beeping without RAM in. Check all the power rails to ensure they are present, especially ppvcore_s0_cpu.

These are usually the worst of the bunch to solve, and is very likely to be CPU related. Good luck :)

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thanks Reece i check the back, i found some part little oxidised, i clean and still the same... to much for me try fix this board now...but thank you!

Where the oxidation was, check for burnt pins on components, this is likely what was causing it (but this is now logic board repair, so take it to someone who does this if you are not comfortable doing this)

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Check pp1v5 and 1v5_GPU_REG - if it is a gpu panic, than u just have to replace the cap C9560

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