/
내 작업대

기기에 대한 안내서, 부품 및 답변에 신속히 접근할 수 있습니다

DE
Deutsch
ES
Español
IT
Italiano
PT
Português
TR
Türkçe
JP
日本語
EN
English
FR
Français
NL
Nederlands
RU
Pусский
ZH
中文
KO
한국어
가입
로그인
도움말

조정하기

작동 원리

보기:

합격 투표
대기 중인 표결 합격 투표 불합격 투표

이 달의 투표 수:

293

198

184

116

97
키보드 단축키

평판이 20이상 되는 사용자는 문제가 있는 댓글과 게시글에 플래그를 지정할 수 있습니다.

해결책으로 승인하기

게시글: "screen still dim after new inverter cable AND inverter...
마지막 투표:
투표인: oldturkey03 (관리자 결정됨)
–

세부 사항 숨기기

Chris @chrstphr

평판: 49

질문

screen still dim after new inverter cable AND inverter board

게시됨:

Apple MacBook "Core 2 Duo" 2.1GHz 13" White A1181

A few weeks ago the screen went dim on my MacBook. Could see the desktop, and shining a bright light onto it makes it evident it's still fully functional other than the screen. The screen still lit itself up sometimes, usually just for a few seconds.

So I bought an inverter cable. Disassembled the macbook by the instructions here at iFixit (such a very useful resource!). But it was worse. I could still light up the screen by shining a bright light ONTO IT. But it didn't have those few moments now and again where it lit itself up, except when I lowered the brightness to 0 and then STARTED to raise it again, there'd be a brief flash of illumination.

So I bought an inverter board. This brought it back to the former state, where the screen is dim but lights up only sometimes.

I took it to Microcenter, bought a VGA adaptor cable and asked the repair person there if he wouldn't let me hook it up to a screen just momentarily so I could see if my motherboard was the problem.

We hooked it up, and the macbook plus his monitor made a 2-screen setup. I saw my Dock and some icons on his screen, and I saw a second desktop on my macbook's screen. No dimness at all! He said "I'm not seeing a problem here." I said "I know! How disappointing!" Heh. So we figured "Must be cured."

But it was just like when you go to a doctor for some chronic pain, and while you're there the pain's gone and he doesn't see what your complaint is.

As soon as I got the MacBook home, it was back to a dim screen. I can make it illuminate sometimes by just slamming the top shut and opening it. Or by dickering with the brightness control.

I don't know what else it is. Maybe the inverter board had the same problem as the old?

Why did it light up with no issues for several minutes while connected to an external monitor? Maybe because I'd been driving about in the cold and something that was loose "jiggled" for those few minutes into place, and then jiggled loose again when I drove the computer home?

I'm thinking of buying the whole top unit, LCD and frame and all, with the inverter board and inverter cables AND THE OTHER CABLES in it. I'm thinking there's still some cable issue.

Any and all advice is welcome! Thank you!

Chris

rdklinc @rdklinc

평판: 32.4k

답변

게시됨:

Are you stating that while at MicroCenter connected to an external display, you had a reliable backlight, and you did not see it go out once in that situation?

If so, I'd reset the PRAM and PMU/SMC. If that doesn't help, next I'd probably suspect the topcase/keyboard, since these have a surprising amount of electronics in them and are sometimes related to various weird issues, including sleep mode problems. Assuming your board is an 820-2279-A, you can take the topcase off completely and power on the machine by bridging the power-on pads with tweezers to start the machine...these are right above the optical drive connector, and you'll see a small power symbol next to them. Starting it up without the topcase will tell you if the topcase is faulty (if you have a backlight, it's bad).

At the end of the day A1181 backlight issues are usually due to bad screens, but what

you saw when connecting to the external display makes me suspect there is something failing to tell the backlight to turn on under normal conditions, such as a misplaced or missing magnet in the screen frame. Maybe Lemerise would have an idea as to what that could be specifically. There should be a magnet in the middle of the left side of the screen frame. It could even end up being the board itself, because they have a lot to do with the backlight as well. I'd say you might have bought a bad replacement inverter cable (inverters themselves almost never fail), but then again the backlight working 100% with an external monitor attached would tend to rule that and most other things out, since it works fine in a specific situation.

If all of the above fails, I would then proceed to change the screen itself. You can swap the entire assembly with screen inside it as you suggest, but if it works you won't know whether it was the screen, or some other component in the screen assembly. I guess it doesn't really matter though, if you end up with a working computer. If you buy the whole assembly, just make sure to get one with a 3-wall inverter cable (again, assuming your board is an 820-2279-A).

Good luck!

Block Image