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机型:长虹 D2522A 彩电故障现象:开机,出现“三无”检修:用户送修时告知,每次总烧三个脚的“黑方块”,已有几个师傅修过,好则个把月,不好则一到家开机就烧。根据这一说,笔者就不敢贸然换管。分析原理图及实物电路板发现:图中行输出管(以下简称“行管”)V406(2SD2253)其中含有阻尼二极管,基极接 R406A(47Ω/0.5W)电阻,而实物板中却另外接有二只逆程二极管(串接),电阻 R406A 却空着未用。也就是说,实
Model: Changhong D2522A color TV Fault phenomenon: boot, there “three no” Maintenance: When the user informed repair, each total burn three feet “black box”, there are several master repaired, so a month , Poor home is a boot on the burn. According to this, I dare not rush to change management. Analysis of schematic and physical circuit board found: Figure output line (hereinafter referred to as “line control”) V406 (2SD2253) which contains a damping diode, the base connected to the R406A (47Ω / 0.5W) resistance, Two reverse diodes (series), the resistance R406A is unused. In other words, real