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Modelle A1181 / 1,83, 2, 2,1, 2,16, 2,2, or 2,4 GHz Core 2 Duo Prozessor

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Backlight works for a split second, inverter or inverter cable?

Black MacBook Core 2 Duo 2.4GHz T8300 w X3100 GPU

My Core2Duo (model MB404LL/a) is currently around 2.5 years old. I've replaced the airport card a few months ago, and reapplied thermal grease (arctic silver 5) about a week ago. A couple of days ago, I used it to play a movie and some music on the TV. The day after, everything worked fine... This morning, the backlight started giving me some trouble.

When I boot it up, the backlight will flash on for a second, and then dim. If I toggle with the keyboard's backlight brightness buttons enough, sometimes I'll get the light to stay on for a minute or two. Otherwise, it basically will flicker on and then immediately turn off again. Also, I should note that earlier today, the backlight was definitely a bit more reliable- it stayed on for a while, and seemed like the problem had to do with the screen moving- any kind of abrupt jostle would immediately turn off the backlight. There is no issue with the actual display, as I can see the desktop with the backlight off.

I've done a bit of reading, and figured it's either the inverter or the inverter cable. What do you guys think? I am fairly comfortable with taking apart the laptop, but I would love to get some input on the issue before doing any serious work... Are there any quick ways to see if I had loosened the inverter cable during my thermal paste application?

Thanks.

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If moving the screen causes the problem, I would bet on the cable. If it stays the same while moving the screen it's probably the inverter. But I would check the logic board connections before spending any money.

Here's how I replace the inverter: MacBook Core 2 Duo LCD & Inverter A1181 (fast method) Replacement

UPDATE

Apple MacBook "Core 2 Duo" 2.4 13" (Black-08) Specs

Identifiers: Early 2008 - MB404LL/A - MacBook4,1 - A1181 - 2242

Here's how to check the inverter cable: MacBook Core 2 Duo Inverter Cable Replacement

MacBook Core 2 Duo Installing LCD & Inverter (fast method) A1181 Bild

Anleitung

MacBook Core 2 Duo LCD & Inverter A1181 (fast method) Replacement

Schwierigkeitsgrad:

Moderat

1 hour

MacBook Core 2 Duo Inverter Cable Bild

Anleitung

MacBook Core 2 Duo Inverter Cable Replacement

Schwierigkeitsgrad:

Schwierig

1 - 3 hours

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Thanks for the reply. If it were the inverter, would the backlight work at all? It definitely seems that moving the screen causes the problem. I can get the backlight to stay on for a little bit after playing with the position, but it does flicker a little and then eventually die again.

von

Also, which connections should I be checking to look for the logic board connections? How many are there exactly? Sorry if this is widely available information, but I want to be as thorough as possible when I do this.

von

It sounds like the cable but the inverter may also be in the process of failing and works when cold and then fails as it heats up. See the link I posted on checking the cable.

von

I'll take a look at the guide later this week. I started to take it apart, but it seems that the innards of the black book are a bit different that what is shown on the white core 2 duo. The process seems a bit lengthy as well, so I'm going to have to wait until I have some more time... Perhaps I will stop by the Apple store and see if they can diagnose the problem before I proceed any further... Thanks for the help! I will post updates on any progress as I get there.

von

Hook it up to an external monitor to isolate the problem to the display area.

von

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I may have found a fix for this...

I was having the same issue with a Macbook A1181 that I bought off of eBay (thinking I could try to fix it for my wife). I replaced the Inverter board and cable. Neither of these seemed to do the trick.

I noticed that setting the display brightness to the lowest setting (off) by using F1 then tapping F2, the display backlight would work again for a split second. After this I decided to mess with the "Energy Saver" settings and noticed that when the "Automatically reduce brightness before display goes to sleep" is not selected I didn't have any problems with my backlight anymore.

I am not sure why this setting would have affected this since I was using a charger and had the "computer sleep" set to never and "display sleep" set to 1 hr. But once I selected this option my backlight started acting up again.

I hope this will eventually help somebody else!

Model: Macbook4,1 (white) running OS X 10.6.8

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It looks like I spoke too soon! It will work for awhile but still goes out until I change the brightness settings again.

von

I am experiencing the exact same issue. Did you ever find a solution for this?

von

After testing the same screen on a couple of MacBooks with different combinations of the multiple inverter cables and boards that I have accumulated, I realized the problem was actually the backlight. I finally bought a used screen and have not had any issues since.

von

Thanks! I actually took mine apart and tried swapping the inverter cable, inverter, and the display with a similar model that worked to find out the backlight was the issue in my case too. Ordering a replacement soon.

von

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andrew wird auf ewig dankbar sein.
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