It could be one of:

Newer modules often utilize the HD44780 standard with 0V to 5V contrast. Understanding the 94V-0 Marking

The component marked "KL SN102" is likely a proprietary power controller or driver IC , commonly found in LED drivers, LCD monitor power boards, or switching power supplies. It is frequently a re-branded version of a more common chip, or a dedicated "jellybean" part meant only for the factory that assembled the board.

In the intricate world of electronics repair, engineering, and hardware reverse-engineering, few things are as frustrating as encountering an undocumented component. The string is one such enigma that frequently appears on Printed Circuit Boards (PCBs), often leading engineers and hobbyists on a lengthy quest for a datasheet.

Avoid the sketchy "free PDF" sites that make you click through 5 ads. Instead: