I've had this iMac since it's release. Been running great, until a while back it kept forcing itself to sleep and even shutdown sometimes, while in the middle of something. Found out the cause was overheating. Brought it to Apple and they replaced the screen, logic board, redid the heat sync, and I don't know what else. After that, it ran fine. Until recently, just after my Apple Care ran out of course (was covered before). Back to over heating issues after less than a year of the repairs.
Currently not running too much, Twitterrific, Discord, Safari (this window & 2 Twitch streams) and the GPU is sitting around 170-180º. Seems each Twitch stream I open adds another 5-10º on top of that. If I open a game, it'll jump 30-50º, which may be normal for all I know, but I never think of watching the temps until an issue starts happening. When the iMac gets to be around 200-250º it goes to sleep/shuts down, which I think is normal.
Problem is, I'm not too keen on trying to repair this myself by opening it up and redoing the heat sync. Would Apple charge a lot for just that? I know a logic board replacement and other stuff they did before would have cost me a lot, if it hadn't been under warranty. Was planning to wait until next year to replace this iMac, but with more than half the year to go and unsure when new Mac models will be out next year, I don't know if I can wait that long with this one in the current condition.
I've seen a few people suggesting sticking fans on the back of the iMac to help. Does that really help? A fan blowing against the body of the iMac, not into the vents, doesn't seem like it would help at all. Maybe down the temp 1-2 degrees, if anything. If I'm wrong and someone actually does have good results, what fan is used to do this?
Also, a more minor issue I have that started after Apple replaced the screen. The image retention/burn started AFTER they changed the screen. I should have brought it back in to have that issue fixed ASAP, but I was very busy with work & happy that they did fix the overheating issue, even if just temporary, until now. Now it's not under warranty though, so I don't think they'd fix that issue, although caused by them months ago.
Specs:
iMac 5K 27-inch late 2014
4 GHz i7
32 GB 1600 MHz DDR3 RAM
AMD Radeon R9 M295X 4096 MB
Currently not running too much, Twitterrific, Discord, Safari (this window & 2 Twitch streams) and the GPU is sitting around 170-180º. Seems each Twitch stream I open adds another 5-10º on top of that. If I open a game, it'll jump 30-50º, which may be normal for all I know, but I never think of watching the temps until an issue starts happening. When the iMac gets to be around 200-250º it goes to sleep/shuts down, which I think is normal.
Problem is, I'm not too keen on trying to repair this myself by opening it up and redoing the heat sync. Would Apple charge a lot for just that? I know a logic board replacement and other stuff they did before would have cost me a lot, if it hadn't been under warranty. Was planning to wait until next year to replace this iMac, but with more than half the year to go and unsure when new Mac models will be out next year, I don't know if I can wait that long with this one in the current condition.
I've seen a few people suggesting sticking fans on the back of the iMac to help. Does that really help? A fan blowing against the body of the iMac, not into the vents, doesn't seem like it would help at all. Maybe down the temp 1-2 degrees, if anything. If I'm wrong and someone actually does have good results, what fan is used to do this?
Also, a more minor issue I have that started after Apple replaced the screen. The image retention/burn started AFTER they changed the screen. I should have brought it back in to have that issue fixed ASAP, but I was very busy with work & happy that they did fix the overheating issue, even if just temporary, until now. Now it's not under warranty though, so I don't think they'd fix that issue, although caused by them months ago.
Specs:
iMac 5K 27-inch late 2014
4 GHz i7
32 GB 1600 MHz DDR3 RAM
AMD Radeon R9 M295X 4096 MB