Перейти к основному содержанию

The larger of Apple's MacBook Air laptops featuring dual microphones and 802.11ac Wi-Fi connectivity.

Вопросов 466 Показать все

No backlight, even after replacing fuse and backlight IC chip

Hi guys. I have an A1466 which I was so stupid as to spill liquid in. This caused the classic no backlight problem. I have researched more about this fricking problem than anything else I can think of 😄. I invested in all the equipment so I could fix this problem myself. So I went to war.

First time I replaced just the fuse. Turned the mac on, and the fuse blew. I assumed then that the problem would be with the IC chip. So I also replaced this one - and the fuse again. This time when turning on the Mac, the fuse didn't blow, but there is still no backlight. I shine a light on the back and I can see that everything else is functioning.

Could it be that I have not replaced the IC correctly? There are a lot of "balls" that need to line up, and perhaps being the amateur that I am, they are not all "connected". So my question is:

How can I probe around and locate the issue? Any way to test the IC or should I just reflow it?

Best,

Morten

Ответ на этот вопрос У меня та же проблема

Это хороший вопрос?

Оценка 0
Добавить комментарий

Ответов (1)

This sounds like you had a short in the pathway to the display at the start which is why the fuse burnt. Now the path is open from the damage.

So you need to inspect the LVDS cable connections both at the main logic board and within the display assembly. Review Steps 19 & 20 in this guide MacBook Air 13" Mid 2013 Display Assembly Replacement and once you get the display removed you can then inspect the other end. I’m sure you’ll see damage and will likely need to replace some parts here.

Был ли этот ответ полезен?

Оценка 0

4 Комментариев:

Thank you very much for the answer. Could you elaborate on this part:

"This sounds like you had a short in the pathway to the display at the start which is why the fuse burnt. Now the path is open from the damage."

What do you mean by open from the damage, and should I probe with the multi meter to identify the damage or will I be able to spot it visually?

из

@mortenhans51842 - if I have two nails which are connected to a sizable battery (+ & -)sitting in a glass or plastic container which has distilled water (not Tap) nothing will happen as there is no free ions to decompose the water. Now put in a teaspoon of table Salt dissolved in the water now the nails will have bubbles building up this is the hydrogen and oxygen gas. This action can also dissolve the metals within your system.here the contacts within the connectors. In addition the distance between the positive and negative can be quite close which speeds up the process acting like a fuse burning out. And of course once burnt the power won’t pass.

As a habit I always check the cable and the board connectors as better than 50% of the time that’s the issue.

из

Thank you Dan, I will attempt that. I should add that I tested the motherboard in a working Mac of the same model, and I get the same backlight issue. When switching back to the original motherboard again, the Mac works fine again. Doesn't that point to a problem somewhere on the motherboard itself?

из

@mortenhans51842 - “ As a habit I always check the cable and the board connectors as better than 50% of the time that’s the issue.”

So in this case the logic board connector.

из

Добавить комментарий

Добавьте свой ответ

Morten Hansen будет очень признателен(а).
Статистика просмотров:

За последние 24 час(ов): 0

За последние 7 дней: 2

За последние 30 дней: 16

За всё время: 139