I lack any knowledge of electronics. All I knew is the tv did not turn on. Yet with only a few questions M. Truong over the phone was able to narrow down the problem with my Sony tv. He proceeded to order the part and within a few days was able to come to the house and do the repair. Unfortunately I was not in town and we postpone for a week. When he arrived he was all smiles. He changed the control board in a record time and adjusted the tv. It works beautifully. A truly outstanding service!!!