B321/B421
7.2. Troubleshooting
Symptom | Possible Cause | Remedy |
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No picture is displayed | 1. | The power cord is disconnected. | 1. | Plug in the power cord. | |
| 2. | The main power switch on the back of | 2. | Make sure the power switch is switched | |
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| the display is not switched on. |
| on. |
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| 3. | The selected input has no connection. | 3. | Connect a signal connection to the | |
| 4. | The display is in standby mode. |
| display. | |
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Interference displayed on the display or | Caused by surrounding electrical appliances | Move the display to another location to see | |||
audible noise is heard | or fluorescent lights. | is the interference is reduced. | |||
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Color is abnormal | The signal cable is not connected properly. | Make sure that the signal cable is attached | |||
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| firmly to the back of the display. | ||
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Picture is distorted with abnormal | 1. | The signal cable is not connected | 1. | Make sure that the signal cable is | |
patterns |
| properly. |
| attached firmly. | |
| 2. | The input signal is beyond the | 2. | Check the video signal source to see | |
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| capabilities of the display. |
| if it is beyond the range of the display. | |
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| Please verify its specifications with this | |
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| display’s specification section. | |
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Display image doesn’t fill up the full size | The zoom mode is not correctly set. | Use the Zoom mode or Custom zoom | |||
of the screen |
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| function in the Screen menu to fine tune | ||
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| display geometry and time frequency | ||
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| parameter. |
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Can hear sound, but no picture | Improperly connected source signal cable. | Make sure that both video inputs and sound | |||
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| inputs are correctly connected. | ||
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Can see picture but no sound is heard | 1. | Improperly connected source signal | 1. | Make sure that both video inputs and | |
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| cable. |
| sound inputs are correctly connected. | |
| 2. | Volume is turned all the way down. | 2. | Press [ | ] or [ ] button to hear sound. |
| 3. | [MUTE] is turned on. | 3. | Switch MUTE off by using the | |
| 4. | No external speaker connected. |
| [ | ] button. |
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| 4. | Connect external speakers and adjust | |
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| the volume to a suitable level. | |
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Some picture elements do not light | Some pixels of the display may not turn on. | This display is manufactured using an | |||
up |
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| extremely high level of precision technology: | ||
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| however, sometimes some pixels of the | ||
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| display may not display. This is not a | ||
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| malfunction. | ||
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A still picture is displayed for an over | Do not allow a still image to be displayed | ||||
display after the display is powered off. | extended period of time | for an extended period of time as this can | |||
(Examples of still pictures include logos, |
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| cause a permanent | ||
video games, computer images, and |
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| on the display. | ||
images displayed in 4:3 normal mode) |
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