Here you will find videos related to repairing Macbook logic boards that are missing PM_SLP_S4_L. PPBUS_G3H and PP3V42_G3H are present, as well as S5 rails, but rails above them are not present due to the MCP or PCH not letting PM_SLP_S4_L go high. PM_SLP_S4_L turns on the S3 rails. Keep in mind THERE IS NO QUICK FIX!!! You must use your brain to figure out what YOUR specific issue is. I am not trying to teach you how to copy the specific solutions I post in these videos. I want you to learn how the circuit works as a result of watching my real time diagnostics & thought process so you can learn how to solve your specific problem YOURSELF!! If you try to apply these solutions to your problems you will fail because you cannot apply someone else's solution to your specific problem. You must figure out what your problem ACTUALLY IS!!! If you are still confused, we offer in person one on one tutoring which you can check out here. http://www.rossmanngroup.com/logic-bo... We also offer logic board repair services here. https://mailin.repair/macbook-logic-b...