After spill no internal video but external video works.
A bottle of pop had a leakage in my bag where my MacBook Pro also was. So I dried it but it started behaving strange. Suddenly the video went black and it would not charge. I took it to a Apple service center and they said the logic board was bad. (no guarantee, a fortune of money).
I replaced the Magsafe card since there was no light when I connected a charger. The MBP starts up now and works fine - on external screen only. The internal screen is black.
I then purchased a new LVDS (video) cable and changed it. Cleaned the connector on the logic board. No luck. I even tried with a known working display. Internal video is just black.
So I guess there is no use to buy a new LCD? Does anyone know if the logic board can be damaged in a way that external video works but internal does not?
With the system running and the laptop's display being used - Take a flashlight or light and point it to the display. Look for faint images on the screen of your desktop or what ever should be displayed at that point. If there are faint images then then the problem is most likely related to the WLED driver & booster circuitry. If there are no images then the problem is something else or you have multiple problems.
Please tell us the results. Do you know how to use a multimeter and do you have one? What kind of optics do you have?
asle, sorry to butt in. May be this will help "OK for all the people with no backlight on a macbook pro 15" unibody.
first of all thanks to the man with the schematic....
I take it you have checked the flurecent and inverter allready and both are ok.
on the logic board there is a fuse that supply's the voltage/ currant to the backlight circuit...its F9800.Its located on the board near the botom of the left fan on the component side of the board.(same side that has the cpu and gpu on it).
the fuse is a smd and its white with just a dot on it.get your multimeter and if its open circuit thats you problem." and "On the 13 MBP it is actually on the other side of the board from the CPU and GPU which makes it very convenient to check. It is a 2A fuse in an 0402 package so it is tiny." Check on here http://forums.macrumors.com/showthread.p... for further information. the schematics they are talking about is on here http://www.2shared.com/complete/woR7wLVv... Hope this helps, good luck