The TV turns on, shows the "Samsung" logo, and then immediately restarts.
Once you have successfully written the dump file to the SPI Flash chip and reassembled the TV, you may face a new challenge: Download dump samsung ua40h4200ar rar
Sometimes the issue is not the firmware but the backlight inverter circuit acting up, forcing a protect mode that looks like a firmware crash. Important Steps After Flashing The TV turns on, shows the "Samsung" logo,
(specifically the UA40H4200ARXUM model) is a common requirement when facing "stuck on logo," bootloop, or no-picture issues caused by corrupted firmware. The TV turns on
dump" or the mainboard model number (usually or similar BN41-xxxx) to find a verified .rar file [1].