With a passion for electronics can come a desire to understand the inner most workings of the television. Many folks who fix these units also own shops that provide parts and supplies as well as repair services to TV customers.
If you plan on owning a shop, you'll need to be familiar with common business practices as well as zoning and tax laws in your area. Make sure you have all of the legal permits required before opening a business venture. You'll also need customer service training in order to work with customers and suppliers. Each brand of TV may require different parts, so you'll need to build a rapport with companies that can help you be successful.
Equally as important, is understanding the components of different types of televisions, including tube, LCD, HD and plasma, and how to fix them. Sometimes the fix will be a simple tuning or broadcasting matter, in which you can attempt to boost the antenna's transmitting signal to get a better picture. Sometimes the customer may need to replace the remote. Unfortunately, sometimes the screen gets warped, audio performance is bad or circuits need replacing. With tougher issues, you'll need the proper training to know which supplies are needed to complete the job. In order to actively do repairs, it's usually required that you have an associate's degree or certification equivalent. Luckily there's online training and college courses available all over.
If you prefer to just deal in supplies, make sure you promote your services to those in the field. You'll still need to know the ins and outs of monitor screens and picture resolution, as well as being able to tell the difference in pieces, because if a customer needs a new power supply, you don't want to hand him a new antenna or projector.