Sunlight Readable Touch Monitors | High Brightness LCD

Troubleshoot for LCD Monitor

Troubleshooting

Computer monitors are fairly straightforward. You plug them in, turn them on, you’re good to go. But inside that seemingly simple screen is a web of complexity. And the more complex something is, the more likely that something will go wrong. DisplayBoost is here to help you navigate problems as they arise and fix things fast so you can get up and running.

Minor Issues and Concerns

When things go wrong, let us know. Contact DisplayBoost and we’ll help you get things sorted out. But there’s a few things we’ll need from you first, just to make the process go easier for us both.

Model number
Serial number
Date of purchase
Brief description of the problem.
We may ask for proof-of-purchase, such as the original invoice.

First thing’s first. If it’s a minor issue, DisplayBoost will try to help you resolve it over the telephone or via email. If we determine the issue cannot be resolved, we’ll issue you a Return Merchandize Authorization number (RMA).

You are responsible for sending the defective part or product back in its original packing material at your own cost. Once received, DisplayBoost will send you the replacement item. Removal and/or installation costs are your responsibility.

If a part or product is returned and subsequently determined to have no fault or defect covered under warranty, DisplayBoost may charge you for all costs and expenses incurred.

LED driver board

Another issue that can lead to a blank image on the screen of your LCD is a problem with the LEDdriver board as power issue. The backlight on LCD has a LEDdriver board that could go bad as well. When this happens, you may need to replace the LEDdriver board. When LEDdriver board is not functioning properly, it could look like the backlight is not working, when in reality, it is functioning fine.

Shadows

When the settings are not quite right on the LCD, you may see shadows trailing anything moving on the screen. This is a sign that you need to adjust the sharpness of the display. How you go about this depends on the model of LCD you own. For many, you can open an on-screen menu on OSD. Locate the sharpness setting and turn it down. This may be a process of trial and error. Turn the sharpness down and then watch the LCD for awhile. If necessary, you can continue to turn the level down until the shadows disappear. Normally factory reset will work.

Backlight

A backlight built into the LCD illuminates the screen’s liquid crystals and the crystal continues to create the image. When the backlight malfunctions and no longer effectively lights the liquid crystals, it causes the image on the screen to blink. A failing backlight is easy to recognize. The panel cell still works but there is no light source coming from backlight system. The LED light bar might be burnt. In common, LED diodes might get burnt individually if it’s worn out. To check if the whole light bar is broken, you need a meter to check if the Current is still there

Blink Symptoms screen flickering

LCDs have an optimal refresh rate that may be lower than the highest refresh rate supported. For example, a 15″ LCD operating in analog mode may support 60 Hz and 75 Hz refresh. Although it sounds counterintuitive to anyone whose experience has been with CRTs, reducing the refresh rate from 75 Hz to 60 Hz may improve image stability. Check the manual to determine the optimum refresh rate for your LCD,and set your video adapter to use that rate. Or, the issue happened on LVDS cable with bad connection.

Power

Occasionally, an electrical problem related to the power source can cause a blinking LCD. You should try unplugging the power and plugging it into a new outlet to see if the blinking ceases.

Poor image

If the screen is displaying a full, stable image, but that image is of poor quality, first verify that the display is not connected through a KVM switch or using an extension cable. If so, connect the display directly to the video adapter using the standard cable. If that is already the case, adjust the brightness, contrast, and focus controls. If you are unable to get a proper image using these controls, the problem is most likely a clock or phase mismatch, which you can cure by taking the steps described in the preceding item

Signal out of range” message

Occasionally, an electrical problem related to the power source can cause a blinking LCD. You should try unplugging the power and plugging it into a new outlet to see if the blinking ceases.

Text or lines are shadowed, jaggy, or blocky

This occurs when you run an LCD at other than its native resolution. For example, if you have a 19″ LCD with native 1280×1024 resolution but have your display adapter set to 1024×768, your LCD attempts to display those 1024×768 pixels at full screen size, which physically corresponds to 1280×1024 pixels. The pixel extrapolation needed to fill the screen with the smaller image results in artifacts such as blocky or poorly rendered text, jaggy lines,

Some pixels are always on or always off

This is a characteristic of LCDs, particularly older and inexpensive models, caused by defective pixels. Manufacturers set a threshold number below which they consider a display acceptable. That number varies with the manufacturer, the model, and the size of the display, but is typically in the range of 5 to 10 pixels. (Better LCDs nowadays usually have zero dead pixels.) Nothing can be done to fix defective pixels. Manufacturers will not replace LCDs under warranty unless the number of defective pixels exceeds the threshold number.

A persistent after-image exists

Again, this is a characteristic of LCDs, particularly older and inexpensive models. The after-image occurs when the display has had the same image in one place for a long time. The after-image may persist even after you turn the display off.

Moving images blur, smear, or ghost

Dim image

Use the brightness control to increase image brightness. If you have set brightness to maximum and the image is still too dim, please contact our technical support.

Image is only partially backlit

One or more of the LED Diodes that provide the
backlight have failed.

Please contact our technical support.

Horizontal or vertical lines appear

If one or more horizontal and/or vertical lines appear on the display, first power-reset the computer and display. If the lines persist, run the auto-setup function of your display. If that does not solve the problem, power the system and display down, remove the video cable, and verify that the video plugs and jacks on both computer and display ends do not have broken or bent pins. Even if all appears correct, try a different video cable. If the problem persists, contact the display manufacturer.Possibly the panel IC is burnt.