HDMI Port damaged with oscilloscope?
GND from Oscilloscope to TMDS_CLOCK-


This was almost certainly the cause of your problem.

TMDS Clock- is not a ground; it's one half of a differential pair! Connecting it to the ground on your oscilloscope shorted it to ground, which may have damaged the transmitter.

For future reference, you should have connected the ground of your oscilloscope to pin 11 (TMDS clock shield), or to the overall shield of the HDMI cable, to measure the behavior of one of the signals in the pair. Alternatively, to measure the differential signal, connect one probe to each signal in the pair and set your oscilloscope to measure the difference between the signals.