测IC201(TDA4501){27}脚电压升高为2.6V左右(正常值为1.5V),表明故障系由沙堡脉冲信号异常而导致解码电路IC501(TDA3561)不能正常工作。查行逆程脉冲电路元件,无异常;再测场输出块IC601(TDA3653)各脚电压,发现{5}脚电压升高为24V左右(正常值为13V),{8}脚电压由3.7V降为0V。查场输出块外围元件均正常,断定TDA3653损坏。更换后故障排除 |
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