Older television sets use CRT (cathode-ray tube) technology to produce onscreen images. Although CRT sets are usually reliable and can produce brilliant pictures, they have declined in popularity in recent years due to the availability of LCD and plasma sets. These newer sets are much less bulky and come in bigger screen sizes. Older CRT sets can suffer a range of problems including picture interference caused by magnetic energy and weak antenna signals. Serious technical problems usually require professional help, but many repairs can be undertaken without expertise.
Locate devices that use magnetic energy, such as stereo speakers or small electrical motors, away from your CRT TV. CRT sets come with internal de-magnetizing features which prevent magnetic activity from effecting picture quality. Such appliances can cause picture problems on CRT sets, however, if the set's magnetization function is faulty.
Purchase a de-gaussing cable if picture interference continues. These are available from most electrical shops and are used to de-magnetize faulty sets.
Hold the de-gaussing coil around 3 inches from the TV's screen. Move it in a circular motion, increasing the breadth of the circles until you have covered the whole screen. Your set should now be fully demagnetized.
Adjust your antenna if local television channels are broadcast with poor picture quality. Poor picture reception can be caused by a weak signal on the antenna. Move it into different positions until picture quality improves.
Remove the screws that affix your antenna to the top of your old TV with a screwdriver if problems remain.
Purchase an antenna from an electrical store. Fix it to the top of your TV using a screwdriver and screws. Make sure that the antenna is securely fitted, but not so tight that it can't move at all, as you may need to change its position at a later time.
Check the copper cable that links your cable box to your old TV if pictures appear grainy or unstable. The coaxial cable usually fits to the outlet labeled "RF" on older televisions. Make sure it's securely fitted as a loose coaxial connection can cause fuzzy images.
Twist the metal fitting at the tip of the coaxial cable while in the RF outlet. Tiny adjustments to the tip's position can yield significant improvements in your old TV's picture quality.
Examine the coaxial wire to see if it has any tears or dents, as these can cause the signal strength to be weakened. If there are any signs of damage, purchase a new cable from any electrical store.
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