This Apple MacBook Air has old liquid damage that's finally caught up with it. But all the power rails look fine - so how do we diagnose its power on sequence to see where it's getting stuck? FlexBV by Paul Daniels can be purchased here - this is not an affiliate link, however my licence was provided for free. The resources I used can be obtained for free, but this video is a great demo on how FlexBV makes diagnostics faster and easier. https://pldaniels.com/flexbv/ Check out Adamant IT 2 for the Pod Cast and More: null Join the Discord right here: https://discord.gg/BDV4hTc Support the channel directly at: https://patreon.com/adamantit Follow us on Twitter at: https://twitter.com/adamantit Check out our Instagram at: https://www.instagram.com/adamant.it Chapters: 00:00 - Intro & Assessment 05:15 - Disassembly & Ultra Sonic Clean 13:25 - Checking S5, S4 Rails 20:02 - Checking PM_SLP_S4_L 26:12 - PM_RSMRST_L & U8130 32:05 - Replacing U8130 39:10 - Conclusion