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K Capacitor Problem
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Senior User
Join Date: Jan 2003
Location: Newport Beach, CA
Status:
Offline
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Hi,
I have a Rev A iMac 20". Today I opened it to add more ram and noticed two capacitors look to be splitting open at the K seams. The others are sealed, but these two are open. There doesn't seem to be anything leaking from them. My iMac is working fine at the moment, but this can't be good. Should I keep using it or will they get worse and cause problems? This is the 5th midplane put in. Do you think this would be another replacement? Or should I ask for a new unit?
Thanks!
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MacBook Air, Mac OS X (10.7), 1.6 GHz, Core i5, 4GB 1333 MHz DDR3, 128 GB SSD, 24" LED ACD, 1TB Time Capsule (late 2009), IOS4 ATV, 16GB iPhone 4
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Mac Enthusiast
Join Date: Sep 2001
Status:
Offline
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Your 5th midplane? Damn. You've bee more than patient. I would have been asking for a new machine after the third. Five replacements for the same part is terrible.
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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I would have asked for a Power Mac after the second breakdown. . .
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Fresh-Faced Recruit
Join Date: Jul 2005
Status:
Offline
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Originally Posted by PeterKG
Hi,
I have a Rev A iMac 20". Today I opened it to add more ram and noticed two capacitors look to be splitting open at the K seams. The others are sealed, but these two are open. There doesn't seem to be anything leaking from them. My iMac is working fine at the moment, but this can't be good. Should I keep using it or will they get worse and cause problems? This is the 5th midplane put in. Do you think this would be another replacement? Or should I ask for a new unit?
Thanks!
I've gathered informations from around the web and got a discussion group on this topic
http://discussions.info.apple.com/we...ZD.0@.68b3aed3
From Hood
Capacitor Plague??
http://www.answers.com/topic/capacitor-plague
http://www.wopr.org.uk/photos/iMac-caps/cap.jpg
http://forums.macnn.com/mac-desktops-65/257613/guess-what-new-imacs-have-dodgy/print/
Quote from this page:
As the capacitor ages, its capacitance decreases while its effective series resistance (ESR) increases. When this happens, the capacitors no longer adequately serve their purpose of filtering the voltages on the motherboard, and system instability results. Some common symptoms are:
# Not turning on all the time; having to hit reset or try turning the computer on again * Instability (hangs, BSODs, kernel panics, etc), especially ones which get progressively worse with time
* Vcore or other system voltages fluctuating or going out of range, possibly with an increase in CPU temperature as the core voltage rises
* Memory errors, especially ones that get more frequent with time
* Spontaneously rebooting
* Failing to complete the POST, or rebooting before it is completed
* Never starting the POST; fans spin but the system appears dead
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