Why does the screen freeze and show black 'barcodes'?

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MacBook Pro 13インチ Unibody Late 2011

2011年後期モデル番号A1278 / 2.4 GHz i5 or 2.8 GHz i7 プロセッサー

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Ilya @electric_forest

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投稿日: 2021年5月1日

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Why does the screen freeze and show black 'barcodes'?

My MacBook Pro screen freezes and shows black barcodes occasionally. Sometimes it happens with a scary roaring sound, causing me to push the power button immediately. It seems that without switching the power off, the laptop won’t restart itself. It happened the first time after replacing the original 2x2GB RAM with the new 2x4GB RAM and the original HDD with the SSD. See the picture above.

MacBook Pro 13" Unibody Late 2011

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lemerise @lemerise

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投稿日: 2021年5月1日

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Remove the ram stick from the lower slot and try the computer. This is a well documented ram issue with the MBP 13” 2012.

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Thanks a lot! I'll try that. Do you think changing RAM to 2x8GB might solve the problem? Or is it a socket/logic board issue?

Ilya さんによる2021年5月2日

Yes logic board ram socket issue.

lemerise さんによる2021年5月4日

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Thanks a lot! I'll try that. Do you think changing RAM to 2x8GB might solve the problem? Or is it a socket/logic board issue? — Ilya

Jesse Hooton @hootonberg 評価: 11.5千 Mobile Device E.R. 7 5 1 · Answer 1 · 2021-05-01T07:13:45-07:00

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Jesse Hooton @hootonberg

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I would double check the RAM to make sure it’s seated however in my past experience with a 2012 non retina pro, it had to do with the motherboard. After I dropped mine it constantly had issues like this where it would freeze up and become unresponsive.

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The 13" models use the main RAM for video RAM as such a bad SO-DIMM or socket can cause video issues like this try taking one module out to see if its stable and then try the other in the same socket slot. Then repeat in the other socket slot. If neither SO-DIMM made a difference in either socket then you have a deeper issue.

Dan さんによる2021年5月1日

Thanks, Jesse! Did you change the logic board to fix the problem? If yes, did you choose the same logic board or a one with better performance? I'm thinking of changing my i5 logic board for the one with i7. Here they say it fits the late 2011 MacBook Pro. However, I'm not sure if it can make a big difference.

Ilya さんによる2021年5月2日

Thanks @danj I'll do that!

Ilya さんによる2021年5月2日

@electric_forest at the time it was covered under warranty so they used the same board every time but I still went through two or three boards in the 8 months I had it.

Jesse Hooton さんによる2021年5月3日

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MacBook Pro 13インチ Unibody Late 2011

Why does the screen freeze and show black 'barcodes'?

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