When the TV gets stuck on the logo screen.

Installing the wrong firmware (e.g., 1080p firmware on a 768p screen) can "brick" your motherboard or cause a black screen. Always verify the board number and panel resolution before flashing. Do you have the second part of the file, or

CV628H-B42 . This is a common "3-in-1" (power supply, LED driver, and mainboard integrated) universal Smart TV motherboard. Resolution: Specifically for 1366x768 (HD Ready) panels.