例1 故障现象:屏幕上部和下部各有2cm的白色拖尾状条纹。检修:据用户讲,条纹有时消失,但有严重雪花点。检查,发现出现条纹时各频道均有,条纹消失时,L段和H段低端有雪花点,U段基本正常。分析似有接触不良现象,用力晃动电视与用户盒的连接线时,条纹和雪花交替出现,当图像清晰时有条纹出现,图像不清 Example 1 Symptom: There are 2cm white streaks on the top and bottom of the screen. Maintenance: According to the user, the stripes sometimes disappear, but there are serious snow spots. Check and found that there are stripes when the channels are all, when the stripes disappear, L and H low-end snowflake point, U section basically normal. Analysis seems to be poor contact phenomenon, forced shaking the TV and the user box cable, stripes and snowflakes alternately appear when the image is clear when there are stripes, the image is not clear