Facing TV Problems? Ask a TV Technician.
Hello and sorry you're having problems. The ribbon cable connections to the Mainboard typically have a flip up plastic tab that releases the cable. See the video below (even though it's for a Buffer board- the connectors should be the same):
If you need further assistance let me know. Please do not forget to click a POSITIVE RATING before you go- as it's how I am credited for my work. You can follow up at any time, at no additional cost.