Chosen Solution
Hello, I have done a lot of reading on this problem so far and it keeps landing me a possible fuse problem but I am having a problem find the correct fuse that may need to be replaced. I will give you a little background on how this started for me. I got this Air from a family member and it had broken hinges I replaced all the hinge pieces including the LCD cable. When I powered it on I got a white screen so I though it may be another bad LCD cable because I read that was the common problem. So I purchased another cable and same situation. I was messing around with the cable while the power was on to see if the connection was loose and the screen went black. After that happened I assumed I blew out the driver for the LCD screen on the actual screen. I bought another screen powered the laptop and the screen works again, but no back light now. So after some reading I found out it could be a possible fuse, I got a hold of A1304 wiring diagram and narrowed it down to a few possibilities which I am having trouble finding on the motherboard. My question is could someone help me find the proper fuse I may need to replace so I can get the back light working again. Also if anyone know of any other good possibly solutions besides a fuse that may need to be replaced please let me know. I have posted pictures and the A1304 wiring diagram, please refer to pages 59-63 in the diagram for the LCD pages. A1304 wiring PDF Please any help is greatly appreciated, I have posted on here before about the same laptop and received good help. Thanks, Roy
Roy, looks like a A1304 - EMC 2253 Late 2008. The fuse is underneath the cloth tape. Remove that to reveal the backlight fuse reference designator F9800. It is a 2AMP-32V fuse in a 0402-HF package. Since you do have the schematic, I will only list the components that you should check on: U9750 Backlight Driver located on the under side of the board. can not mark its location since I do not have an image of the bottom side. If you want to post that with your question, we can point it out to you as well F9800 Backlight fuse Q9806 Power FET Q9807 Field Effect Transistor N Channel MOS Type
Always remember, there is a reason why fuses blow. Make sure that you have no other power issues with your board. Hope this helps, good luck
Hello, Maybe an answer here
just to say thanks …. my is working again but i like to ad that you need to exchange the cable lcd-logic board this the reason to kill the fuse. ps i didnt have a same fuse but i add a good one and dont take off the bad . i will pos a foto. i i think it will more easy to all.alternatine fuse replace imac backlight and again thanks to all cheers sorry for the bad english pedro
Que tal PEDRO, tengo un Macbook Air a1237 con el mismo problema, has de cuenta que si se ve la imagen en el display pero muy tenue apenas se alcanza a ver con una lampara como si fuese el inverter, las bisagras habrán dañado el cable? que me recomiendas, saludos. Heyy PEDRO, I have a Macbook Air A1237 with the same problem, you have to realize that if you see the image on the display, but very faint barely manages to see a lamp as if the inverter, hinges have damaged the cable? I recommend you, greetings. (sorry bad english)
hello from Portugal :) HUGO.. well yours like my don’t have lamp its LED so you will not find that extra lamp cable.. its all in LCD cable ..it appears that cables break internally make some short circuit and kill the fuse its a good practice to exchange the cable if that happens . if it was mine i replace the fuse, change cable and clean all the machine, and put some new heat past in cpu/gpu…. buena sorte…
