Dead A2485 M1 Max - missing PP3V8_AON
Автор: Macrepair
Загружено: 2025-07-24
Просмотров: 1040
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...
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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
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