This Fix-It Guide on television repair tells how a flat-screen or tube-type television works, what often goes wrong, how to identify a television problem, and what parts and tools you will need to fix it. It then gives simple step-by-step instructions for how to service a mechanical tuner and refers you to instructions for how to test and replace electronic components. Before calling the TV repair service, there are many things you can do yourself to eliminate or reduce the cost of technical repair.