No boot after battery replacement and new trackpad

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MacBook Pro 13インチ Unibody Early 2011

2011年初期のモデル。モデル番号はA1278 / 2.3 GHz i5 or 2.7 GHz i7 プロセッサー。

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Karen Selph @kselph

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投稿日: 2016年11月5日

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No boot after battery replacement and new trackpad

I replaced my battery and trackpad, and everything was fine (computer booted, charged up the new battery etc.). Then, I noticed that the trackpad was too hard to click, so followed instructions to make it better (turning the star-shaped screw). Upon closing the case after this, and trying to boot, the computer started to do so normally, then within a second or two, stopped and went dead.

Now, no MagSafe green light, no boot at all. After reading some posts, I disconnected the MagSafe and the new battery, and was going to wait 24 h before trying again. Also tried plugging in the MagSafe (60W) briefly after all as unplugged for ~15 min, to see if green light came on -- it didn't.

So, have I blown something inside? Should I just be patient and try again tomorrow? I am worried I shorted something...Used the IFixit Kit for all, but when screwing in the two screws for the battery may have touched something with the screwdriver...Used the plastic thingy to get the battery disconnected, so that should have been ok...

Any advice? Thanks!

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Have you tried booting it with the battery disconnected and the charger plugged in? Does the charger light up a very dim green, or is it showing no light at all?

Reece さんによる2016年11月5日

Just tried this: get a very dim green light on the charger - but no boot action at all.

Karen Selph さんによる2016年11月5日

Are you positive all cables and connectors are secured to the board? Pop them off, and reseat. A slightly lifted component can cause a computer to show no signs of life.

Justin Berman さんによる2016年11月5日

I tried popping off the connector to the battery, and any other obvious connectors to the board, but no difference.

Karen Selph さんによる2016年11月5日

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Reece @reecee

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eFix Ltd (UK)

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投稿日: 2016年11月5日

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Sounds like something on the logic board has shorted, if it turned off after a couple of seconds. Check the charger IC area, it is about the 4th large component up from the battery connector, and the chip has a little 625 written on it. Check for anything burnt, and make sure the pins around the chip look shiny, and not dull or burnt. Damage to this area can cause the dim green light issue, and is common.

Let us know how this goes.

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Wow: need good eyes for this! With my magnifying glass I found the 625 chip - looks like it has 7 shiny pins on each of 4 sides that look shiny. If I look downstream of those, there are some other little humpy bits that mostly look light brown on top but a few look black (left and right orientation relative to the chip, if 625 is right-side up)? Otherwise, don't see anything I could reasonable call burnt...I can take a picture and send if that helps...thanks for your help!!

Karen Selph さんによる2016年11月5日

Yes, please could you send a picture across? I'll check it out in the morning.

Reece さんによる2016年11月5日

ok - will do (but in a few - in Hawaii, so not so late here!) - best, K

Karen Selph さんによる2016年11月5日

I sent the pictures to the IFixit address - but just found out I shouldn't have. I don't know how to put pictures into this comment stream...but I see I can put it into the answer section below...K

Karen Selph さんによる2016年11月7日

Hmm, looks fine to me. With the charger plugged in, feel the top of the charging chip (625) to see if it is getting hot. Feel the other chips as well, if something is getting hot (other than the CPU or GPU) it means either the chip or a component leading to the chip is pulling a voltage rail to ground.

At this point, it is logic board diagnostics and soldering, so it might be best to take the board to someone who can get it in front of them and check this properly. It is difficult to find out what would be causing the issue without trying test parts and measuring points on the board.

Reece さんによる2016年11月7日

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Have you tried booting it with the battery disconnected and the charger plugged in? Does the charger light up a very dim green, or is it showing no light at all? — Reece
Just tried this: get a very dim green light on the charger - but no boot action at all. — Karen Selph
Are you positive all cables and connectors are secured to the board? Pop them off, and reseat. A slightly lifted component can cause a computer to show no signs of life. — Justin Berman
I tried popping off the connector to the battery, and any other obvious connectors to the board, but no difference. — Karen Selph
Wow: need good eyes for this! With my magnifying glass I found the 625 chip - looks like it has 7 shiny pins on each of 4 sides that look shiny. If I look downstream of those, there are some other little humpy bits that mostly look light brown on top but a few look black (left and right orientation relative to the chip, if 625 is right-side up)? Otherwise, don't see anything I could reasonable call burnt...I can take a picture and send if that helps...thanks for your help!! — Karen Selph
Yes, please could you send a picture across? I'll check it out in the morning. — Reece
ok - will do (but in a few - in Hawaii, so not so late here!) - best, K — Karen Selph
I sent the pictures to the IFixit address - but just found out I shouldn't have. I don't know how to put pictures into this comment stream...but I see I can put it into the answer section below...K — Karen Selph
Hmm, looks fine to me. With the charger plugged in, feel the top of the charging chip (625) to see if it is getting hot. Feel the other chips as well, if something is getting hot (other than the CPU or GPU) it means either the chip or a component leading to the chip is pulling a voltage rail to ground.

At this point, it is logic board diagnostics and soldering, so it might be best to take the board to someone who can get it in front of them and check this properly. It is difficult to find out what would be causing the issue without trying test parts and measuring points on the board. — Reece