1. Luminance signal loss: performance for fuzzy color images, no sense of depth, adjusting brightness, contrast, no significant changes at this point to turn off color saturation, may was a black screen. These faults are the maintenance switch S301 caused by poor contact. As long as the $301 normally closed contact ②, ③ feet short, failures can be eradicated.

2. No colour faults: characterized by colour from time to time, and sometimes appears in one color or no color. These faults are IC601 (AN5622) 12 foot color phase control of the external capacitor C618 (70pF) caused by poor contact or open circuit. Maintenance will be only about 20pF C618 ends and ceramic capacitors, if color phase is not normal, then the capacity adjustments and ceramic capacitors can be. C168 adjustable capacitor is not easy to buy, and even when they are put on a variable capacitor may still relapse because of bad contact after long, so outside and ceramic capacitors are the most effective method of eradication.