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My Macs internal display is not working

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When I turn my mac on I can't see anything. But when I use my hdmI cord I see the tv screen. Also when I shine a flashlight behind the screen I can see. Please help I use my Mac for homework. My cat spilled water on my Mac top left if this helps

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Help us help you. The more complete the description of your problem is (what MBP you're using - there are many versions, what OS you're using -there's a lot of those too, some historic detail or perspective - i.e. when did the problem first occur, why do you think it may have occurred (dropped, wet or loaned out the machine?) , a full compete description, the text or screen shot of any error messages) the more assistance we can provide, and, the sooner we can provide it..

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The liquid damage was a significant detail you omitted in the original Question... Now you have some sensible Answers.

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There are many things that can happen when water (or any liquid) enter in contact with the logic board and you lose the backlight function.

1- the LVDS socket on the logic board could be shorted and damaged cutting the electric flow to the screen backlight. NB: the video cable connector could also may be damaged by the socket short. Visual inspection must be performed to check it out.

2- the backlight fuse located near the LVDS socket may be blown by liquid spill. Check fuse continuity with a multimeter.

3- transistors, resistors near the LVDS socket or the charger IC may be shorted. You need the board schematic and the board view file to troubleshoot the components.

4- Charger IC could also be the culprit. The IC is 28 pins package (most of the time named U7000). Not easy to replace.

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From your description it looks like your backlight has died. I had a similar problem and you will either need to do a logic board repair by replacing a faulty chip or this may be an issue with the display its self. Try googling "macbook pro backlight" and look at some of the results.

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