Chosen Solution
I obtained a Macbook Pro 13 unibody with non functioning display (everything else works). I took it apart ad discovered that the LVDS cable end was completely destroyed. I ordered a replacement display assembly (complete with LVDS cable). I now have an image but no backlight. Upon close examination of the components surrounding the LVDS connector I notice I have a component missing compared to a detailed photo of the same motherboard that I found on the net. I am not sure if this component might be a fuse that has been removed. I am trying to find someone who has one of these logic boards accessable that can identify what this part is supposed to be. I can provide a picture of the area of the board showing the part.
This is solved. Turns out the WLED display driver chip was internally shorted to ground. That in turn blew the 2A fuse that fed the P channel FET that drives the power to the boost circuit. Replaced the LP8543 device and then the 2A fuse (tiny 0402 package) but still did not have a backlight. Started probing around and discovered that the enable pin for the LP8543 was low. They use a 300K / 100K resistor divider network to get the 3V enable. My 300K resistor was open. Replaced that and BOOM I have a backlight. And that missing device is a capacitor on the output of the boost. Considering the hours I put into this it hardly seems worth it but I rescued this board from the landfill anyways :-) Soooo there you have it.
Hello, my 2.4 ghz macbook pro a1286 15 inch, has the same problem, the backlight is dead, I tried a new screen and I connected to the LVDS connector, after this experiment I’m forever the backlight, I do not know where to start your search for the fault, one thing is for sure not get power to the ribbon of the backlight on all the threads, no one has a wiring diagram for this model? thanks Luca Hi,the unibody 15 a1286 is totally different,don’t have similar schematic,the bost chip of led backlight is other brand,regards
Hello, it looks like I’ve the same problem. Macbook pro unibody 13". I recovered a totally nonfunctioning liquid spill with success. Only the backlight is not working. With an external Monitor the MacBook works perfect. I also can see the picture on the internal LCD in a strong light. Can you support me with a circuit diagram / identification of the components on the PCB? Where can I measure if the driver is working or not? I did not identify the 2A fuse-where is ist placed? Can you mark it in the pictures? There is also the possibility of the connector beeing damaged but I also do not have the pinout of the connector. I really appreciate any support. Martin
greeting i have the same problem my macbook pro 13’ great with external monitor i really would like the pic so i can see what are the parts that i need also the parts # and where to buy them… i really appreciate alexander asm@embarqmail.com
I have the same problem with a liquid damaged 13 inch macbook pro - display works but no back light I also need the same information to do the repairs that were requested by Martin Schaller Gil Yetter - gilyetter@austin.rr.com
Hi, I also have the same problem with my Macbook Pro 13" 2.4Ghz 2010 model. I have taken photos of the logic board which is different to the pictures posted above. http://i1206.photobucket.com/albums/bb44… The only white capacitor that looks anything like the one in the above images is this located near the battery connector http://i1206.photobucket.com/albums/bb44… http://i1206.photobucket.com/albums/bb44… Can anyone advise where to find the correct capacitor Many Thanks.
