: "REF66" usually denotes a specific software revision or panel configuration (refresh rate/resolution) required for the board to communicate correctly with the 4K display. Detailed Board Review
The TP.MS638.PC822 is a versatile replacement motherboard designed to restore or upgrade 4K televisions. Download MS638 PC822 3840x2160 REF66 part2 rar
: Provides a repository for TP.MS638.PC822 technical files and repair tools. : "REF66" usually denotes a specific software revision