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该彩电亮度、伴音、黑白图像正常,但无彩色,按功能键有变化,但无相应的字符显示。根据故障现象,分析无字符显示故障原因可能是微处理器(CPU)ST6367字符振荡器停振或无字符消隐信号输出所致;无彩色故障可能是色解码电路TA7698AP异常引起。开机通电,用万用表直流10V档测ST6367字符振荡第(28)、(29)脚电压均为5V,无异常,测字符消隐信号输出第(22)、(23)脚电压也正
The color brightness, sound, black and white images normal, but no color, according to the function keys have changed, but no corresponding character display. According to the fault phenomenon, no character is displayed. The cause of the fault may be caused by the microprocessor (CPU) ST6367 character oscillator stopping or no character blanking signal output; no color fault may be caused by abnormal color decoding circuit TA7698AP. Turn on the power, with a multimeter DC 10V file test ST6367 character oscillation (28), (29) pin voltage is 5V, no abnormalities, the character blanking signal output (22), (23) pin voltage is