[the_buzz_man]

http://forums.macnn.com/69/mac-noteb...z-logic-board/

I wanted to update an old thread because of the help it provided me. Hopefully it will help someone else down the road.

I read on the original thread about the F1 fuse controlling power to the inverter board and that it being stuck open could lead to no backlight. I finally found where this fuse was and discovered that mine was in fact stuck open. I soldered a wire over the fuse to see if it worked, which it did. My backlight is working.

I wanted to update the original thread and post pics of the mobo so others will know where the fuse is.




Thanks to the original poster.

Mike Busby

[seanc]

Now that you've proved that it works, I hope you'll replace it with another fuse.

[Dork.]

To be fair, it's kind of hard to replace a surface-mount fuse when you don't know what part to replace it with.

[seanc]

Very true Dork - there are some suggestions in the previous thread, but not exact.
Just have to not leave it unattended. You should see/smell something before anything dangerous happens.

[the_buzz_man]

I have an extra fried mobo here and hope to be able to lift the fuse from it, but not sure if I can. It has some rubber stuff around it that melted when I tried, but we will see.

If anyone knows exactly what fuse I can purchase to use it would be much appreciated.

Thanks!

Mike Busby

[Dork.]

I think surface-mount fuses are rated by their current. Someone with the proper equipment could pop off the fuse and measure the current between those two pads while the computer is on and the backlight is on full power. (Would the backlight sink more current while powering up or down?) To be complete, you probably ought to measure the voltage relative to ground, too.

Then, we could add some margin to the current measurement (maybe double it?) and find a fuse that fits.

I'm going on ancient memory here so hopefully someone with more knowledge will come along and comment....