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I like to take as close to orthorectified photos of the PCB as possible and then align the pinout diagrams from the datasheets to see if anything matches. So far no luck on any of the HDMI interfaces in QFP-128 packages from the usual sources.
@miek the IT6604E is an excellent guess! other than the pin 26 NC, everything else seems to line up correctly for the HDMI TDMS input pairs and the 10-bit RGB parallel output.
@th Perhaps the die reveals something after an X-ray photo.
@th that might be an ITE logo hiding under there?