The ADV7630 must be configured differently depending on whether the clock frequency is within the range 27MHz to 150MHz or above 150MHz.
HDMI Tx Test Map, 0x24 = 0x00 (default) for TMDS clock frequencies in the range 27MHz to 150MHz
HDMI Tx Test Map, 0x24 = 0x43 for TMDS clock frequencies over 150MHz.