Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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PSU Overheating 4SNS TpOP error


my imac 24 seems to have a problem related to PSU. I already downloaded temp&fan monitoring apps. while the fan app seems to work fine, it drops the temp on almost every indicator but not on the power supply position1, which even gets higher as the fan rises its speed.

i already past the hardware test and got the following error:4sns/1/40000000:TpOP-106.816 which seems to be related to the psu sensor.

so , so far the fans seem to be working as expected but the psu sensor keeps rises up to 95ºC and then the imac goes to sleep mode. i already checked few posts with the same problem but got no final solution of the problem. any ideas? could this indicate a problem just with the psu? could be the HD which leads to this problem?apps like watching video quickly rises the temp


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Apple does a good job in its designs and people often try to fix a problem with the wrong approach (like over riding the fans). While that might buy you some time, you do need to get to the heart of the matter.

Yes, it does sound like your PSU unit is in need of replacement.

Follow this IFIXIT guide on the process of removing it iMac Intel 24" EMC 2111 Power Supply Replacement.

You may want to look at your house wiring & power as well. Get a ground tester at the hardware store to start with and if you have a problem get an electrician in to fix things. Your power company can also put a meter on your buildings power feed or wall outlet to monitor drops & spikes for a few days.

At least get a good surge suppressor and if you notice your lights do flicker it maybe wise to get a good UPS. In either case plug in all of the interconnected hardware to your iMac into the same unit so its all protected so a voltage spike can't jump across.

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