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三、常见故障检修实例例13 故障现象:无彩色。分析检修:测量色解码集成电路IC_(401)(TDA3560)的各脚电压,并着重检查副载波振荡电路,消色电路、识别电路和及其外围元件,因为这几个电路在一部分损坏会造成无彩色故障。经检查发现②嘟电压由3.5V降勾2.2V,⑥脚电压由3V降为0.5V,再仔细检查外围元件未发现异常,此时判断为TDA3560内部识别部分损坏。拔下原TDA3560,用一块新的TDA3560代
Third, common troubleshooting example Example 13 Symptoms: no color. Analysis and Maintenance: Measure the voltage of each color decoder IC IC_ (401) (TDA3560), and check the subcarrier oscillation circuit, the achromatic circuit, the identification circuit and its peripheral components as a result of the damage caused by these circuits No color failure. The inspection found that the beep voltage from 3.5V down hook 2.2V, ⑥ pin voltage dropped from 3V to 0.5V, and then carefully check the external components found no abnormality, this time to determine the TDA3560 internal identification part of the damage. Unplug the original TDA3560 with a new TDA3560 generation