Dead A2485 M1 Max - missing PP3V8_AON

A2485 M1 Max - missing PP3V8_AON Mosfet failure killed U8100 (343S00515) PMIC. PP3V8_AON was shorted, after removing U8100 partial short persisted. Short was detected with diode mode measurements. This video demonstrates why having a fast USB-C power meter is essential. It allowed me to detect power cycling during the initialization of later power stages, indicating a likely short on one of the main power lines. That immediately pointed me to where I should start measuring with the multimeter, significantly speeding up the diagnostic process. https://www.avhzy.com/html/product-de... https://store.avhzy.com/index.php?rou... 00:00 - Start 16:17 - Visible damage on U8100 PMIC 16:50 - Removing the PMIC 21:00 - Continuing with voltage injection to find the shorted component 22:22 - Removing PP3V8_AON controller chip 23:23 - Trying to further isolate the PP3V8_AON power line 24:25 - Extracting donor PMIC from known "good" A2442 motherboard 28:34 - Reballing the chip 55:32 - Still 5V because I forgot to put back PP3V8_AON controller