测量TA8427各脚电压，发现输出电压高达9V以上，（2）脚电压为24V，试替换TA8427，整机光栅出现，但屏幕顶部卷边。用新的CRT试着替换，光栅正常。说明原CRT偏转变质，引起烧掉TA8427，引起屏幕左边亮块故障 |
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