今接修一台长虹changhongG29E6彩电(行输出变压器型号BSC68M3),故障为不开机. 测行推动电压140V,再测推动管V401(DA4544)基极开机时有0.35V左右电压,在测量电压时偶尔能开机,但有时画面左右不满且中间有部分重叠,这是典型的行激励不足的表现,从而怀疑行激励滤波不良,更换C403(10U/160V),故障还是会出现并且烧行管D2253.遂怀疑行激励管DA4544性能不良,更换为性能更佳的C4544及行管D2553,故障排除. |
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