Computer dies on battery power

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MacBook Pro 15インチ Unibody Early 2011

モデル番号A1286、発売日 2011年2月/2.0, 2.2もしくは2.3 GHzクアッドコアIntel Core i7プロセッサ

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Scott @cotsman

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投稿日: 2019年4月12日

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Computer dies on battery power

I just installed the a second replacement battery in my MacBook Pro.

After fully charging the battery and disconnecting the power adapter, the MacBook just dies after taxing the computer a little bit like scrolling through pictures in Aperture of Photos.

The computer has recently undergone a major repair after sitting in a drawer for over a year. I removed the mother board and applied heat to the GPU and CPU, reassembled the computer and it booted. The original battery, however, would not take a charge.

I’m wondering if I would have better luck with a better battery or could there be another problem with the computer?

The battery I installed is a relatively cheap after market battery manufactured by Cameron Sino. Will I have better luck with a Ifixit battery?

I just removed the magsafe charger and went to markup a photo I took of the motherboard. During this process the computer died.

In the photo of the motherboard the component with a red rectangle fell off while I heated with a heat gun. I got it back on with the heat gun. I am wondering if this could be the problem. I am not sure what the component does. I used a thermometer and kept the temperature under 230 degrees celsius. Another issue I had after initially putting the computer back together was the wires to the magsafe female end in the computer got squeezed and the computer was not getting power. I discovered this issue loosened the screw and freed the wires and it booted but the 8 year old battery that hadn’t been used in over a year would not charge. I do not know how to read schematics and board views. I do not have any tools for working on logic boards.

How will I see if the battery is delivering enough power?

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The component is an inductor coil L8920 0.56UH-31A. Its part of the PPVCORE_GPU powering GFXIMVP6_PHASE line on U8900

Dan さんによる2019年4月13日

@danj Right, not at all related to the charging circuit that will have to be troubleshooted separately. It takes quite a bit of heat to get that big coil off the board, very lucky thing that everything still works around Cpu/Gpu :)

arbaman さんによる2019年4月13日

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arbaman @arbaman

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投稿日: 2019年4月12日

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Applying heat to a faulty GPU isn’t a repair, it’s mainly a temporary fix .

It may well be a GPU related behavior that happens when Mac switches to dedicated graphics. I would recommend downloading and running Valley from Unigine to verify if the GPU is really working before concentrating on battery.

Take also into account that depending on the intensity and time heat was applied secondary damages such as components burning and shorts to ground may happen.

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Thanks for your response! I ran Valley and it did not crash. I did the GPU fix a few weeks ago and have not experienced any graphical errors since. The problems start when trying to run on battery power. the computer turns off after a few seconds or minutes of moderate intensive use. The original battery would not charge so I can't test it with it unfortunately. Would the shorts to ground or damage to other components only appear on battery power?

Scott さんによる2019年4月13日

Lets check the battery you are now using. Run this app CoconutBattery. Take a snapshot of the main window and post it here for us to see iFixitでの質問に画像を追加する方法

Also what did you do to fix the GPU?

Dan さんによる2019年4月13日

OK, the battery looks good right now, lets run it off battery until it dies, then reconnect the MagSafe charger and take another snapshot before the system charges the battery. Lets see if the battery is delivering enough power,

I'm starting to think you have a deeper problem on the logic board which will need deeper skills to diagnose and fix. Do you know how to read schematics and board views and have the needed tools to deal with SMT components?

Dan さんによる2019年4月13日

@cotsman That benchmarking utility is good to determine Gpu issues and it seems in this case we can rule out Gpu. Unfortunately as you may see something went wrong when you tried including the picture with the component you soldered back. Try again enclosing that picture so that we may get an idea what we are talking about. Components shouldn't fall off the logic board in any case, molten metal has a quite high cohesive force..if that happens the temperature reached it by far too high.

arbaman さんによる2019年4月13日

Sadly this is going to need some deeper diagnostics which appears to be beyond what you can do. Time to find someone with the deeper skills locally.

Dan さんによる2019年4月13日

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The component is an inductor coil L8920 0.56UH-31A. Its part of the PPVCORE_GPU powering GFXIMVP6_PHASE line on U8900 — Dan
@danj Right, not at all related to the charging circuit that will have to be troubleshooted separately. It takes quite a bit of heat to get that big coil off the board, very lucky thing that everything still works around Cpu/Gpu :) — arbaman
Thanks for your response! I ran Valley and it did not crash. I did the GPU fix a few weeks ago and have not experienced any graphical errors since. The problems start when trying to run on battery power. the computer turns off after a few seconds or minutes of moderate intensive use. The original battery would not charge so I can't test it with it unfortunately. Would the shorts to ground or damage to other components only appear on battery power? — Scott
Lets check the battery you are now using. Run this app CoconutBattery. Take a snapshot of the main window and post it here for us to see iFixitでの質問に画像を追加する方法

Also what did you do to fix the GPU? — Dan
OK, the battery looks good right now, lets run it off battery until it dies, then reconnect the MagSafe charger and take another snapshot before the system charges the battery. Lets see if the battery is delivering enough power,

I'm starting to think you have a deeper problem on the logic board which will need deeper skills to diagnose and fix. Do you know how to read schematics and board views and have the needed tools to deal with SMT components? — Dan
@cotsman That benchmarking utility is good to determine Gpu issues and it seems in this case we can rule out Gpu. Unfortunately as you may see something went wrong when you tried including the picture with the component you soldered back. Try again enclosing that picture so that we may get an idea what we are talking about. Components shouldn't fall off the logic board in any case, molten metal has a quite high cohesive force..if that happens the temperature reached it by far too high. — arbaman
Sadly this is going to need some deeper diagnostics which appears to be beyond what you can do. Time to find someone with the deeper skills locally. — Dan

MacBook Pro 15インチ Unibody Early 2011

Computer dies on battery power

Update (04/12/2019)

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