Chosen Solution
Hello, I have a 2013 Macbook Pro 15. 10 seconds into the bootup the fans go full throttle, the MacBook is slow to boot, and once it does manage to boot the CPU is > 100% at all times. Ran AHT, it reported – 4SNS/1/40000000 TsOP—124Bought a new trackpad with cable, replaced. No change, same issue.Removed the logic board, cleaned everything and reinstalled. No change, same issue. Any suggestions / help would be deeply appreciated. Thanks.
Check the logic board thoroughly for damage; blown components or damaged sensor circuits can cause this issue. Test it will just the charging port, fans, SSD and trackpad connected; if the fans still go full speed it will be logic board related. If it is logic board related, I would suggest taking it to a repair centre to check out; a decent repairer will know areas to check and will determine what is causing the fault.
