Modern television units comprise a display, antenna or radio frequency input usually called an "F connector", a tuner, and an infrared sensor. The sensor is used to create an interaction with the remote control for switching channels or changing the sound volume or brightness, amongst other commands. The main difference that distinguishes television sets from ordinary computer monitors is the presence of the tuner device, which in modern sets is more often digital than not. A television may also have speakers within the main structure, so look out for these as your first indication of a television.
Unplug the television. Measure the screen (display) size diagonally using a tape measure. Identify a large screen (30 inches or above) or standard 25-inch screen. Large 60-inch type screens are very modern. Look for 25V CRT (cathode ray tube) TV screens with rounded corners or flat-faced 27V screens with square corners.
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Find the male F connector, a type of coaxial connector used for receiving terrestrial television channels. It is a silver component that looks like an ordinary nut with an extra piece of solid wire sticking out of the central hole. Usually, F connectors are found on the tip of VHF (very high frequency) antenna connections. Measure its diameter if possible: It should be 0.438 inches.
Remove the screws holding the back of the television in place using a screwdriver. Find the logic board. According to Repair FAQ, the logic board of a standard television runs at 3.3V.
Locate the capacitor. Look for two identical components like AA batteries stood on end, side by side on the circuit board. They are cylindrical, have a striped coating which is often black and gold and are fixed to two white circles. Find out if they are corroded by looking for leakage of wax onto their external surface and midway bloating. Test their Farad rating using a multimeter. Broken capacitors will prevent the television from functioning.
Find the resistor, which is usually 1 or 2 W in ordinary televisions, as explained by Old Technology. Resistors are small, white boxes with black printed numbers on their top surface and two, silver prongs coming out of one end. Burnt resistors must be replaced to repair faulty televisions. Use a multimeter or ohmmeter to test its voltage or check your manual for a schematic showing what it should be (burnt ones are harder to test).
Identify the cathode ray tube, a large, tube-like component connecting the small circuitry with the back of the screen itself. It is one of the easiest parts to find owing to its size and simple but recognizable shape. The tube (electron gun or cathode) opens out near the back of the television display into a funnel shape. Common CRT screen resolutions are 300 dpi (dots per inch), as described by Kioskea.
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Dismantling televisions is dangerous if you leave them plugged in or switched on. You could be electrocuted. Unplug them and take care with their highly tuned, delicate circuitry. If you are unsure, ask for the help of a professional.
Take care not to damage the threads of the screws, scratch the television or misplace internal components.