mr data is this the same 3a rated fuse??
http://uk.farnell.com/multicomp/mcsef-u-003/fuse-smd-3a/dp/1841088
saves me using donor boards
many thanks
@Musicsoul78
yes, my MBP is connected to external monitor and this is what i get when i go to system preferences.
Looking at the spec sheet the fuse you shownis huge, L=6.1mm! I think the one in your logicboard is at most about 2 mm, but even then I am not so sure. I believe Dadioh mentioned most MBP fuses are package type 0402 or 0603.
mpb 13" 30 lvds pin out
notice the BKLT PWR/EN pins are always the ones that short or corrode as a result of water damage
always check these
Good observation. The reason for this is that the backlight power pins are carrying 27V (full brightness). The process of electromigration is proportional to voltage so if you continue to run the logic board after the spill you will get accelerated corrosion on those pins with higher voltages.
Bottom line. If you have a spill always take the time to clean the logic board of all contaminants before attempting to power the Macbook. Some people think they got lucky because it is still working but the joy is short lived as the corrosion advances and destroys the board.
how come the spill does not blow the fuse or the wled driver first???
and when it corrodes the pins it also corrodes the pads and traces it sits on, leaving it impossible for us to replace.
No question about a backlight, but since it seems that most technical problems are solved in this thread I post this question here...
After I posted my first questions here a few months ago I repaired some 13 and 15 inch macbooks (mostly battery charge and backlight issues) but now I have this white 13 inch from 2007. A duo core. It looks like new, but unfortunately it keeps giving kernel panic, ie the grey screen of death "You need to restart your computer"
It is definitely a hardware problem.
What I did:
- using different and good memory modules
- trying both SIMM-slots apart
- booting from HD and from DVD
- try another DVD-player and another HD
- try with a harddisk from another Mac if I could log the kernel panic and show it on that other mac. No logs were made?
- check if OS 10.6 was compatible with a core duo. It is, but it says it need at least 1 GB. Since I tested with 512-modules, I retested with 1 GB modules. Still that message...
One strange thing: when powering up the screen flashes once (for 1/10 second) then, after a second or so it works normally.
Maybe (I hope) there are some people who have suggestions, about what can cause this error or how to find out so?
Depends on the spill. Some liquids conduct better than others. Pure water is actually a poor conductor. Add a few ions like salts however... And it is a great conductor. If the liquid can effectively conduct enough current to blow the fuse then it will.
The connector pins, solder pads, and traces are all carrying that voltage and so they will all corrode to a certain extent spending on their finishes.
There's a lot of discussion and previous examples like yours earlier in this thread!
I'd start by checking the component with the "p" on it (near the LVDS connector) for continuity.
The first picture below was before I cleaned the board, the second was after the cleaning and I circled what I believed to be the 0402 fuse.
Again, thanks to all in this thread, especially Dadioh, for helping me out in what seemed an impossible task for someone like me!
i do not have continuity . that what i thought the fuse was . i checked both side to make sure i do not have a short to ground and i do not the voltage on 1 side is 12.5 and 0 the other
but if i turn off mac and bridge the fuse ,when i turn back on the mac starts then shuts down agian with no image on lcd
with out it bridge it turns on with image on screen but no back light
do i have to reset the smc after bridgeing or something else
where is the wLed chip and how do i test it
thank you
My issue is that my backlight works only when I boot from a cold start up. When when it is warm and I close the lid, open it back later no backlight. I cant adjust it meaning the brightness through the F1 or F2 or in preferences nothing happens stays the same. When its working the brightness thing comes up on the screen like im adjusting it but no dimming or brighting. So when my macbook has been on awhile if closed the back light goes out completely What could this be? any help please, Thank you!
mpb 13" 30 lvds pin out
notice the BKLT PWR/EN pins are always the ones that short or corrode as a result of water damage
always check these
"Start by measuring resistance from the backlight pins on the lvds connector to ground. I suspect you might have a short there" thank for the reply
dose any one know what pins on the lvd is backlight and what they should be getting for resitenes reading to ground
thank you for everyone that has responded to help me with this no backlight issue
Hi Dadioh,
I have read several of your suggestions here and very impressed that you are providing a helping hand to resolve our macbook problems. I would like to thank from the bottom of my heart to you and others providing help for all your contributions here. I couldnt believe earlier there can be such a thread for these component level discussions but only found this just a few days back.
I have got the same known backlight issue with 13" Macbook Pro 2.26. I received a machine with no capacitor (white one high frequency) as someone already tried on this logic board. Just to be on the safer side I have already replaced the WLED driver yesterday but after powering up there is still no backlight.. Most probably this is because this capacitor is missing? I dont know the value of this capacitor which if you could please suggest and where can I buy one? Any link for the part no. would be highly appreciated..
Thanks.
think the part your looking for is this!!
http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1843812
big white A6 fuse
Thanks for that. But I dont think this is a fuse, its for sure a capacitor. One end is ground I have traced it all along. If you have a similar board then please can you check and double confirm this for me? Thanks for your help.
your description is too vague ,,,,
i need visual guidance as to which component your searching for...
pics please