The machine failure in two aspects: one is the first boot, colorful display grating lines of discontent, to work after 1 h, grating was slow to expand to the full; Second is screen grating lines will change with the image content (mainly for the change of the brightness). When the brighter images into darker images, colorful display line extension. On the other hand, from the darker picture to a bright, colorful display line is narrow. yqGservice manual download site
First open electrify test observation. First test project is to change the image content (brightness change) observe screen line of change, and to measure output voltage + B value. When the screen by a bright picture (blue) to the darker picture image (green), grating line extension, line output voltage + B from + 76 v to 78 v +. When the picture by grass green again back to the original image, celeste grating line narrowing, restore to the original state when the width of the line and the output voltage by + + B back to the original voltage 78 v + 76 v. The test results show that line and image content (image) is the following causality: sky blue image is converted into a grass green one is equal to the image brightness to reduce the scanning electron beam reduced flow lines - equivalent to the output load and reduce the power which the output voltage rise + B to cause the image line extension. yqGservice manual download site
The second project is monitoring line output voltage + B with colorful display work time drift. Record test results are shown in table 2. yqGservice manual download site
The second test results show that the colorful display of grating line extension according to the working time of reason, is because the line output voltage + B increases with working time and slow drift caused by (within two hours of continuous work time, + B voltage value increment was more than + 1.5 V). yqGservice manual download site
From the fault phenomenon and the test results analysis, the basic function of colorful display is normal. The colorful display grating lines with the image content transformation happens (grating brightness changes), the reason may be that: line of the output power of the load ability is poor (or the power of value is bigger, the line of the output load to reduce the level (i.e. the screen brightness is reduced, decrease electron velocity flow in the tube), line output voltage rise, raster image scale. Conversely, when output stage load increase, the line is narrow.

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