海信彩电解码板无字符
检查行场脉冲和字符振荡电路,用示波器测场脉冲正常,测字符振荡电路没有波形,试换晶体无效,再测晶体对地电容的电压为1.5V,而正常电压为5V,测C406、C407漏电,更换后故障排除。
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