Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
Thermal paste is an high heat conductive paste that is applied on the CPU and heat sink to reduce over heating and keep the CPU cool. Thermal paste can lower CPU temps significantly and this is important if you are installing new CPU.
If you have any questions or would like any additional information, please let me know
The job of thermal paste is to transfer the heat from CPU to the heat sink and the CPU fan cools the heat sink and thus the CPU as well.
I can't open the question, but I see that you are trying to replace the board. Are you sure the board is compatible with your old CPU ?
Did you buy board and CPU combined or just board ?
And what is the serial number or model number of your imac ?
Re the article you sent, the step 47 is regarding connecting the antennas. My question is, what model of board did you buy ?
The reason I'm asking is, board of Macs released on particular year or for particular model of one Mac may not compatible with other year models or other models
Let me take a look at it. Please give me a few minutes
What is the exact model number of your Mac ? like A1419
It is printed on the bottom of the stand of the Mac
Take your time
The board you bought is the correct one for your Mac. Re the article you sent, the step 47 is regarding connecting the antennas. Are you saying that your new board doesn't have these pins to connect the antennas ?
They are the antennas of the Airport/bluetooth card. So you have to remove the Airport/bluetooth card from old board and install it to new one. Se ehere --> https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2546+AirPort-Bluetooth+Card+Replacement/15759
You have to remove the Airport/bluetooth card from old board and install it on new board. The pins are of the Airport card. Did you get the instructions I sent you ?
If not, see here --> https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2546+AirPort-Bluetooth+Card+Replacement/15759
You have to take out the CPU from old board and install it on your new board. For instructions, see this link --> https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2546+CPU+Replacement/15764
ArctiClean is to clean the old thermal paste from CPU. You can carefully clean with a cloth swab and no need to use the artic clean solution. DO NOT any water or liquid except the cleaner if you already have it.
When you install the CPU on new board, it is better to apply the thermal paste. For the amount, see here- -> https://www.youtube.com/watch?v=r2MEAnZ3swQ
The ArctiClean is to clean the old thermal paste from your CPU. You put this cleaner on a cloth and clean the surface of CPU. Once it is clean of old paste, you can put new thermal paste directly on the CPU. Make sure you do it like in the video I sent you. DO NOT put excess paste on the cpu
There is no specific amount of cleaner. Just put a few drops on the cloth and wipe out the old paste from CPU. DO NOT apply cleaner directly on CPU.
You have to do this carefully.
You're most welcome.
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Seems like it is taking out the CPU from heatsink and fan. You can take it out from heat sink if you want to apply new thermal paste.
It is better to take it out carefully, install CPU on new board first, apply paste and then install heatsink
Hi there, It's me Ashik again. How is it going ?
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The tools needed are already mentioned on that article.
Yes, it is showing that you need to buy 4mm bits
You're welcome. You can buy it from here --> https://www.ifixit.com/Store/Parts/4mm-Screwdriver-Bits/IF145-200-59
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Sorry for the delay. Only put a small amount of arctic paste as shown in the article I sent you.
Sorry I don't understand. What error are you getting when you turn it on ?
Honestly, I'm not sure what the issue and hard to tell from here. You will have to make sure everything plugged in properly and reconfirm the steps.
You can do the reinstallation. Make sure you follow the steps correctly.
You will have to make sure you did everything in the steps and put all connections properly. I'm not even sure if there is any issue with the internal board or power supply.
Puuting too much arctic paste won't prevent it from turning on though.
It doesn't matter. You can put on heat sink or CPU itself. It just need to be applied properly and in a correct amount, like in the article I sent you
Yes, it has to be in specific direction matching the board. See the CPU replacement article --> https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2546+CPU+Replacement/15764
Turn it on and see if it works
I'm sorry, I don't know what the issue is and it is hard to tell from here. You may need to take it to the store to get it checked.
I'm sorry, it is hard to tell from here. There is no way to tell without checking it on another board.
Make sure you connected the power cables etc properly
Sorry for the delay. Im not at home right now. I will get back to you when Im back
Hi there, Yes, I'm back. Is your Mac not getting any power all ?
If it is still not getting any power, then it is possible that the power supply has failed or something related to power in the board and honestly, I'm not sure what it is. You probably need to take it to the Apple store to get it checked and they will have the required tools to identify and check the board and other components
Sorry, I'm not sure what exact tools do you use to detect it. I've seen Apple use some tools to check the parts of the board
Try resetting the SMC and PRAM.
First reset the System Management Controller of your Mac. Follow the steps below;
Shut down the computer.
Unplug the power cord and also disconnect all other devices.
Wait 20 seconds.
Attach the power cord.
Wait five seconds,then press the power button to turn on the computer.
Reset PRAM and NVRAM
Shut down your Mac
Restart and immediately hold down Command-Option-P-R keys at the same time
Hold the keys down until the computer restarts and you hear the startup sound for two or three times.
Release the keys and let the Mac boot up.
Any change ?
Can you check if the RAMs are properly installed ? Other than that I'm afraid I don't know why it is not working. I'm not even sure the new board is working. It is hard to tell what the issue from here. Sorry
I'm really sorry. I'm out of ideas on this one. I will opt out and open this question to other experts in here. Sorry
See here--> https://support.apple.com/en-in/HT201191
Sorry I don't understand what you mean
It can only be installed in one correct direction, otherwise it will fail or damage. Didn't you install it in correct direction ?
If you followed the CPU instructions correctly, then this is something else. I already opened this question to other experts in here. If they have any idea, they will get back to you
I'd recommend not to buy that. It is probably some other issue you are having. Your logic might be worked. It is better to take it to the Apple Store and they will find out the issue. I'd not recommend to waste any more money on this.