주요 콘텐츠로 건너뛰기

기기를 고치세요

수리할 권리

부품 & 도구

모델 A1286. 2011년 2월 출시 / 2.0, 2.2, 또는 2.3 GHz 쿼드-코어 Intel Core i7 프로세서

617 질문 전체 보기

Backlight is unreliable, behaves intermittently

Hello! I have a laptop, serial F8V, that has an intermittent backlight -- sometimes it's not on when the laptop powers on, and sometimes it is. Sometimes the backlight doesn't come back when the laptop awakens from sleep. You can always generally get it back on, but it takes powering on/off, etc.

The board previously had some corrosion that was cleaned off, and previously was not powering on fully, and just showing a glowing sleep light. So that issue seems to be resolved, but now I've got this backlight problem.

The question is this: Would this problem more typically be the board itself, the topcase/keyboard assembly, or the screen assembly? I don't typically get a lot of the 15" unibodies, so I don't have a really strong sense of what the culprit would be. I vote that the board is bad, since it had slight corrosion (and unibody boards are generally so fragile anyway), but I thought I'd reach out and see if anyone has something interesting to add.

Thanks!

John

답변되었습니다! View the answer 저도 같은 문제를 겪고 있습니다

좋은 질문 입니까?

점수 2

댓글:

Actually that's not the right machine -- it's a 2011 2GHZ i7 quadcore...for some reason EveryMac.com doesn't seem to have its database updated, so it brings up the 2.9GHZ retina i7 instead . When I first plugged it into EveryMac I got really excited, but I quickly realized that it's clearly not the retina model (for one, it has RAM slots).

의견 추가하세요

Manta(만타) 드라이버 키트

112 bits for every fix.

Upgrade Your Toolbox

Manta(만타) 드라이버 키트

Upgrade Your Toolbox

답변 2개

선택된 해법

The most common problem I've had with these machines is the hard drive/ IR sleep sensor cables going bad. They create all sorts of maladies including sleep and back light issues. They will also destroy hard drives. So try replacing the cable and use a hard drive from a known good machine (any 10.7 + system works for me. If nothing else it's a cheap repair attempt and the first thing I do on these machines. (so keep extra 13" & 15" cables on hand).

해당 답변은 도움이 되었습니까?

점수 3

댓글:

Thanks Mayer! I'm glad I asked, because I never would have guessed that one! So if I don't have another cable, I assume I can eliminate that as an issue by simply disconnecting the cable, and if the issues stop, then that was probably it? Thanks again!

Don't assume anything on these. Remember you loose the sensor when the cable is disconnected. On the newer machines the cable is double the width of this one and there is a rubber bumper on the top of the cable as it goes over the upper edge. I've used the newer cables on the older machines and they work fine. See this question: Using new hard drive cable in older machines 821-1480-A

의견 추가하세요

Have you tried resetting PRAM ? (Booting with Cmd+option+P+R keys)

Next step you can do is trying to reset SMC. (This progress is hard to explain so I refer you to apple's website for that Resetting SMC)

Next up is finding the connectors on the logic board which lead to the backlight. If you see any corrosion/soldering damages, then u might have located the problem. I do not own a tech manual for mbp atm but I'm sure someone on this website can provide you with the location of the connectors on the board.

해당 답변은 도움이 되었습니까?

점수 1

댓글:

Yes I've done all the resets and removed all visible corrosion. Thanks

의견 추가하세요

귀하의 답변을 추가하십시오

rdklinc 가/이 대단히 고마워 할 것입니다.
조회 통계:

24 시간 전: 2

7일 전: 4

30일 전: 9

전체 시간: 783