What does this Cap do?

MatthewLTL

macrumors 68000
Original poster
Jan 22, 2015
1,684
18
Rochester, MN


The Cap in question is on the top left (in picture) the the 2nd cap up from the ATA100 IDE connector and above the cap next to that little heatsink.

This cap fell off my logic board several months ago. I realized today that this location is where that cap goes. What does it do? Could it be the cause of no DVI Video? Could it be the reason my AirPort Extreme Died? Should I reattach it?
 

havokalien

macrumors 6502a
Apr 27, 2006
646
46
Kelso, Wa
could do anything

A cap that falls off could do anything. I would think the video card caps and thermal paste would be more suspect but a missing cap on a motherboard could cause any number of conditions.
 

poiihy

macrumors 68020
Aug 22, 2014
2,273
40
Image

The Cap in question is on the top left (in picture) the the 2nd cap up from the ATA100 IDE connector and above the cap next to that little heatsink.

This cap fell off my logic board several months ago. I realized today that this location is where that cap goes. What does it do? Could it be the cause of no DVI Video? Could it be the reason my AirPort Extreme Died? Should I reattach it?
This one?
 

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harrymatic

macrumors 6502
Dec 30, 2013
331
20
United Kingdom
It's probably a decoupling capacitor to smooth out any voltage transients. I doubt it's the reason for the problems you mentioned, but it's not very difficult to replace it. I've accidentally knocked capacitors off PC motherboards and they've been fine.
 

poiihy

macrumors 68020
Aug 22, 2014
2,273
40
So those metal cylinders are capacitors? I've seen them many times on USB things but didn't know what they were.