论文部分内容阅读
一台厦新VCD768机每次开机都处于“死机”状态,故障现象可分为三种:第一种是开机后声音、图像正常,屏显也正常,但好景不长,几秒钟后声、图突然消失,视屏上出现带左右弯曲的七色竖向彩条,遥控及所有按键全部失控;第二种是开机后无任何反应;第三种是开机后屏显只有“——:——PAL”,视屏为“厦新电子”,或带有不同程度“马赛克”的“厦新电子”,仍然是遥控及所有按键全部失控。开盖通电,在电源板上JPP9、JA4和JA5插座上检测各路输出电压,发现+5V_D输出实测值是在3.88～
A building new VCD768 machine each boot are in a “crash” state, the fault phenomenon can be divided into three types: the first is the boot sound, the image is normal, the screen is normal, but the good news is not long, a few seconds after the sound, Figure suddenly disappear, the screen appears with left and right curved seven-color vertical color bar, remote control and all buttons out of control; The second is no response after boot; The third is the boot screen only “-: - PAL ”, The screen is“ Xiamen new electronic ”, or with varying degrees of“ mosaic ”of“ new electronic ”is still remote control and all the keys out of control. Open the lid power supply, JPP9, JA4 and JA5 socket on the power supply board to detect each output voltage and found + 5V_D output measured value is 3.88 ~