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机型:黄山 AH5151C/R 彩电故障现象:开机屏幕出现绿色光板带回扫线,送入电视信号无任何反映。此时,遥控和面板操作均失灵。检修:由于该机无图、无声,且各种操作功能失灵,首先怀疑 CPU 工作异常。该机 CPU 单独安装在一块小板上,将其取出后测5V 稳压输出端,即 Q771(C2621)的 e 极为0V,说明 CPU 未得到工作电压处于截止状态。该5V 电压是通过变压器 T771(PT—0146)整流、
Model: Huangshan AH5151C / R TV failure phenomenon: boot screen appears green light back to the wipe line, into the TV signal without any reflection. At this point, the remote control and panel operations are malfunctioning. Maintenance: As the aircraft without plans, silent, and a variety of operating functions, the first suspected CPU work abnormalities. This machine CPU is separately installed on a small board, after it is removed and measured 5V regulator output, that is Q771 (C2621) e very 0V, indicating that the CPU is not working voltage is off. The 5V voltage is rectified by the transformer T771 (PT-0146)