2.2, 2.4, 2.5, or 2.6 GHz Core 2 Duo processor

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Why is the backlight not working?

I have this same problem with a MacBook Pro 15" Model A1226. It got 2 drops of water on the keyboard and the screen slowly blacked out. It still works hooked up to an external monitor but how do I determine what part to buy?

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@Anthony DeFreitas, same issue as the original question "First we need to know your exact machine. Please give the last three figures of your serial number. " from mayer.


@oldturkey03 Sorry, I had a brain fart and posted the model # thinking I was posting the serial #.

The last 3 of my serial are "YAL"



Anthony DeFreitas, does this look like the specs for your MBP:"

2.2 GHz Core 2 Duo (T7500)

Intro Date: June 5, 2007 Disc Date: February 26, 2008

Order No: MA895LL Model No: A1226 (EMC 2136)

Subfamily: Mid/Late 2007, 2.4/2.2GHz* Model ID: MacBookPro3,1

Std RAM: 2 GB Std VRAM: 128 MB

Std Storage: 120 GB (5400 RPM) Std Optical: 8X DL "SuperDrive"


Have you tried an external display? There were issues with NVidia Chipset. What to look for:

Distorted or scrambled video on the computer screen

No video on the computer screen (or external display) even though the computer is on

Specific products affected:

MacBook Pro 15-inch and 17-inch models with NVIDIA GeForce 8600M GT graphics processors

MacBook Pro (17-Inch, 2.4GHz)

MacBook Pro (15-Inch, 2.4/2.2GHz)

MacBook Pro (Early 2008)

These computers were manufactured between approximately May 2007 and September 2008

Products Affected

MacBook Pro, models with NVIDIA GeForce 8600M GT graphics processors


@oldturkey03 Yes, that looks like what my original specs were. When it first happened you could see video on the screen (just barely, it was very dark) for a week or so but after that only on an external display where the video is perfect. I'm at step 4. Is the display assembly one part or a combination of parts?

@mayer right in the middle of the key board and I'm assuming some drops trickled down inside.


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Power, but No Video (Computer begins to power up, the fans and hard drive spin, the Caps Lock key lights up when pressed, but there is no startup chime or video.)

Note: Examine the display carefully. An image may be barely present on the screen, but with no backlight clearly illuminating the image. In this case, the system is working properly except for the backlight.

Reset the SMC (power manager) as described in “1. Resetting the System Management Controller (SMC)” under “Troubleshooting Tips and Tricks” in the previous section.

Try connecting an external display to check for intact video signal.' If external video appears, 2. check the system for any pending software or firmware updates and update accordingly.

Verify that the LVDS cable connection is properly seated to its connector on the logic board 3. and that the cables are not damaged.

Replace the display assembly.4.

Check all cable and flex connections to the logic board. Try restarting.5.

Replace the logic board.

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First see if you can discern the desktop, when the machine is booted up, using a flashlight. What part of the keyboard got wet?

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It really sounds to me like your inverter has failed. The water may just be coincidental.


That's the part but I'd also replace the cables while I was at it. MacBook Pro 15" (Models A1226/A1260) Inverter/iSight Cable


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Hi @mayer and @oldturkey03,

I performed the surgery and replaced the inverter and the cable but still not seeing anything on the screen. The laptop still boots fine and displays on an external monitor and there was no visible corrosion or other damage on the inside.

Is it time to replace the entire display?

Thanks for your help.

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Hi Anthony DeFreitas, not quite yet:-) I'd check and see if this model has a backlight fuse. You will need a multimeter or ohmmeter to check for continuity. You up to it?


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Anthony DeFreitas will be eternally grateful.
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