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Answer to: Can the logic board be repairedTry removing the logic board and remove the heatsink, heat the GPU with hairdryer for 5-6 minutes. Reassemble and try turning on the computer. If it works and I suppose it’ll work, then it means the problem is the GPU.
Answer to: Which SSD should I buy, PCIe or mSATA, on iMac EMC 2638 (Late 2013)?iMac A2638 (Late 2013) uses PCIe Blade SSD and iMac A2544 (Early 2013) uses mSATA Blade SSD
Answer to: Replacing only the keyboard without full TopcaseYou can replace those rivets with those black tiny keyboard screws. Works for me. In fact, you can reuse those rivets again if you want, done it in Macbook Air. Apply cellophane tape before pulling the keyboard, so you can safe all those rivets.