Toshiba 42L7453D - Check Serial Number via Self Check Screen

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6. After finish writing the “OK” and “Serial number” appear on TV.
OK!!
Serial No: C35244C00001D1
7. Unplug USB mass storage device.
8. Check the serial number by using self check screen.
How to enter the self check screen.
1 Press SETUP on remote control unit.
2 Select “Get Help” >> “System Information”
3 Press “3” “5” “7” “4”