Monitors the current flowing through the display's LED strips to prevent thermal runaway.
(For a visual diagram, search “ILPI354 VA schematic UPD” in image search – but here’s a descriptive layout) ilpi354 va schematic upd
Typically four MOSFETs (e.g., IRF3205 or similar) connected to the transformer to create the alternating current oscillation. Monitors the current flowing through the display's LED