故障现象:伴音正常,水平一条亮线. 检修过程:开机测场块IC401(TA8403K)2脚电压为26V判断场块烧坏,更换后故障照旧.测量电源电压正常,更换自举升压电容C413(100UF 50V)和周边的电解(C416.C417)后,故障依旧.反复检查电源电压.偏转.还有枕校.最后查出R413(1欧.0.5W)开路.更换后正常! |
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