Visual inspection may reveal charred resistors near the primary side of the transformer, indicating a high-current failure. Schematic and Repair Insights
Also, note the : The new ILPI354 is pin-to-pin compatible with the old one, but if you drop a Rev 2.x chip onto a Rev 1.x board, it will not power up without the I²C pull-ups (R1, R2) installed. Add those 2.2kΩ resistors to pins 6 & 7, and suddenly—life. ilpi354 va schematic upd
