Ms-16j91 Schematic Portable Official

The schematic lists PU8 as “RT8223P – QFN-20”. You can order a replacement from Mouser or Digi-Key.

You can trace the 19V DC-in rail from the charging port through the first and second MOSFETs to ensure the main power rail (B+) is being created. ms-16j91 schematic

Details how the CPU communicates with the PCH and GPU. The schematic lists PU8 as “RT8223P – QFN-20”