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I think I blew this fuse after putting in a new ssd and not realizing that the fan won’t run because the new ssd doesn’t have a sensor or something to make the fan run (yes I’m a total novice). Basically the computer ran fine and then boom it went to black. U can see images on the screen with a flashlight. So I think this fuse is part of the backlight circuit?
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@birdseye97 the component in question is NOT a fuse. It is a capacitor. To be exact, it is reference designator C8191 which is a 2.2UF 100V 10% capacitor in a 1206-2 package. It is part of the backlight boost circuit and yes it will prevent your backlight from turning on. It is not related to your SSD at all.
crwdns2934105:0crwdne2934105:0
Thanks, Do you think that the fan not turning on could blow that capacitor?
@birdseye97 does not look like it could do that directly but anytime your fan fails you want to fix that promptly to avoid overheating and catastrophic failure. Overheating in a boost circuit is always a possibility
Is that capacitor replaceable and where could a person get one of those? Thanks!
Yes it is replaceable by desoldering the old one and replace it with something like a Murata GCJ32DL8EL225KA07L. Check at mouser.com or digikey.com. Should be widely available
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What was the SSD you put in? The SSD shouldn't have done this..
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
Dan, it was an OWC mercury electra. I don’t think that the ssd itself caused the problem. I was thinking that the fact that I replaced the ssd with a non factory one that did not have any sensor capable of telling the fan to come on was the problem. The computer ran fine but I guess the fan never came on and so it blew a fuse? Maybe maybe not? Not sure. Just a guess
crwdns2934271:0crwdnd2934271:0 Larry Davis crwdne2934271:0
@birdseye97 - OK, so you didn't handle the thermal issues switching out the HDD with a SSD as the SSD doesn't offer the needed thermal sensor for SMC services to wok properly.
Here's the needed sensor iMac Intel 21.5" and 27" (Late 2012-Early 2019) SSD Temperature Sensor
So yes, the blown Cap could be caused by overheating. The heat build up within the cap also looks like the logic board also has some damage with its traces. This will likely need a bit more than a simple desoldering and soldering in a new Cap.
I would recommend you find someone with good micro soldering skills and has a hot air station (re-work) as this really needs something a bit more powerful that a simple iron.
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
Dan, thanks for the reply. I think that does it then. I t sounds like for me the best thing to do would be to move on. A hard lesson learned. But at least it was learned on an old computer. Oh well. Thanks again for the help.
crwdns2934271:0crwdnd2934271:0 Larry Davis crwdne2934271:0
@birdseye97 no way! Replace that 50 cent capacitor. Anybody with some decent soldering skills can do that. The component is large enough to not require any major micro soldering skills. Your traces do not damaged (it’s obviously a multilayered board and the traces for the caps are not even visible. Clean the soot of with a brush and some alcohol the desolder. You do not need a hot air rework station for this. Right now the most you have to lose is $10 max on parts etc. Don’t give up based on other peoples opinion. You came here to fixit so go for it. Nothing to lose but lots to gain.
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