Normaly, tv can display NTSC. I just test tonight, with 3.2U and setting.txt, i get setting screen, i sync wiimote and setup the wii. With 4.2U, i wait up to 5minutes and still black screen.
With 3.2U after setup, i shutdown the wii and when i try to reboot the 3.2U nand, i got the blck screen...