VIZIO 756TXKCB02K018 MAIN BOARD FOR P75Q9-H1. This board is fully tested and removed from a set with a defective Panel. First, you as the purchaser of the part is accepting the role of the technician in properly diagnosing and installing the part. We do not know your qualifications as such. Secondly, each part we sell came from a TV that had a broken or defective LCD or Plasma panel. Any questionable boards are disposed of.