检查负反馈电容C317，容量应该为50v2.2微法。长虹changhongC2988彩色电视机 光栅收缩,上小下大成花瓶颈行扫描电路 +115V降为80V左右,VQA01第54脚电压待机与二次开机均为4V,VD820损坏 |
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