Our book; Practical methods of defect determination in all electronic boards and devices, fast and successful testing of all electronic components, fault finding in all kinds of electronic boards and devices, affordable and high-quality up-to-date technical service equipments and devices, successful use of test devices, programmable components make back-up, to create data archives, to ensure a good understanding of the issue with step-by-step successful repairs in the technical service, to raise awareness on the subject to advanced levels and to correct misconceptions. Applications have been made for every subject. Recommended for all; technicians, engineers, students, teachers and academicians. We have no doubt that it will contribute to technical personnel working in electronic design, test and fault detection services and will always be the book they will keep in their hands.