Ensure your TV panel model matches the one in the firmware description (e.g., PANSASIO-LA550QE), as incorrect software can cause an inverted or distorted image.
For this board, the service menu code is typically Menu 1147 or Source 2580 . Download MS638 PC821 3840x2160 REF45 rar
.rar archive, which must be extracted to obtain the .bin or image file for flashing. Where to Download Ensure your TV panel model matches the one
TP.MS638.PC821 (A universal driver board for 42-70 inch screens). Resolution: 3840x2160 (4K UHD). Type: EMMC or Chassis Firmware. Download MS638 PC821 3840x2160 REF45 rar
Since this is specialized technical software, it is not available on official consumer sites but rather on technician-led repair forums. You can find this specific firmware on: