: Search the surface of the PCB for a code that follows patterns like: Compal Style is a common Dell board from 2021). LCFC / Lenovo Style Wistron Style : A 10-digit number usually starting with Locate the Revision : Most schematics also require the revision number (e.g., Search Tips for 2021 Models
Using these boards ensures the final product passes safety testing.
The is not a standalone IC. It is a populated printed circuit board (PCB) assembly —typically a 2- to 4-layer board—that functions as a high-voltage, current-sensing comparator or a solenoid driver. In 2021, the most common variant of this board was found to be based around the Texas Instruments LM2902 quad operational amplifier and the LM339 voltage comparator.
Many online repair communities share these files. Popular sources include: