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Screen is dark, Inverter? Cable? Bulb?

Hello!

My girlfriend has a MacBook 13'' A1181 (2.13 GHz, 2GBytes RAM).

Here the problem.

When I switch the book on the screen is dark (realy black, nothing to see), no apple logo, no watch.

Yes the book is realy powerd on!

I know these because i can here (after the boot sequence) the sound of the volume control (when i press F4 or F5).

So where is the error.

Backlight? But i think then i should see something but only in dark.

Inverter? How can i check it?

Software problem? But then i should see something in the boot sequence.

Cable? Thats my assumption.

Please help me.

The book is disassembled. (I can reach the cable, inverter, or LCD)

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hook it up to an external monitor and let us know what you get. shine a flashlight on the screen at an angle and see if you can see the desktop

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Too late!

I already disassembled the book.

Next step is i will check the cable with a continuity tester (Ohmmeter), but first i need very "spiky test prod" (sorry for my english).

So i will inform you on monday.

Thanks

The first thing I'd check since you've already torn it down is the Display Data Cable.

MacBook Core 2 Duo