HP LD4235 41.92-inch LED Digital Signage Display - Manual (Page 72)

After-image appears on the product.
Cause Solution
After-image appears when the product is turned off. If you use a fixed image for a long time, the pixels may be
damaged quickly. Use the screen-saver function.
When a dark image is displayed on the screen after an image with
high contrast (black and white or gray), this may cause image
sticking. This is normal for LCD screen.
The audio function does not work.
Cause Solution
No sound? See if the audio cable is connected properly.
Adjust the volume.
See if the sound is set properly.
Sound is too dull. Select the appropriate equalize sound.
Sound is too low. Adjust the volume.
Screen color is abnormal.
Cause Solution
Screen has poor color resolution (16 colors). Set the number of colors to more than 24 bits (true color) Select
Control Panel - Display - Settings - Color Table menu in Windows.
Screen color is unstable or mono-colored. Check the connection status of the signal cable. Or, reinsert the
computer video card.
Do black spots appear on the screen? Several pixels (red, green, white or black color) may appear on
the screen, which can be attributable to the unique characteristics
of the LCD panel. It is not a malfunction of the LCD.
The operation does not work normally.
Cause Solution
The power suddenly turned off. Is the sleep timer set?
Check the power control settings. Power interrupted.
62 Chapter 9 Troubleshooting