Samsung SMT 3232a HDMI not working

Samsung SMT 3232a HDMI not working Hi need some help / advice please, my Samsung SMT 3232a kept turning off and on, was told it was a main board issue so changed that for a spare bought from internet, now it stays on but the HDMI port will not recognise and I can’t find another part on the internet. Looking for some help, please. Is there anything I can do with the now two faulty boards to make a good one such as swap the ports or is it likely to be something else. Thanks