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Mura is a result of the deterioration of the liquid crystal alignment layer and is most commonly caused by long-term operation under high ambient temperatures. It is an industry- wide phenomenon and Mura is not repairable. It is also not covered by our warranty terms. Mura has been around since the introduction of LCD technology and with screens getting bigger and in operation 24/7, many displays are running in low light conditions. This all adds to the possibility of Mura affecting displays. HOW TO SPOT MURA There are many symptoms of Mura and also multiple causes. Several of these are listed below: • Impurities or foreign particles in the crystal matrix • Uneven distribution of LCD matrix during manufacturing • Non-uniform luminance distribution of the backlight • Panel assembly induced stress • Flaws within the LCD cells • Thermal induced stress - high temperature operation over long periods of time HOW TO AVOID MURA Although we can not guarantee the complete eradication of Mura every time, in general the appearance of Mura can be minimized by these methods: • Lower the backlight brightness • Use a screen saver • Reduce the ambient temperature around the unit BDL4677XL 7. Cleaning and Troubleshooting 7.1. Cleaning Caution When Using the Display • Do not bring your hands, face or objects close to the ventilation holes of the display. The top of the display is usually very hot due to the high temperature of exhaust air being released through the ventilation holes. Burns or personal injuries may occur if any body parts are brought too close. Placing any object near the top of the display could also result in heat related damage to the object as well as the display itself. • Be sure to disconnect all cables before moving the display. Moving the display with its cables attached may damage the cables and thus cause fire or electric shock. • Disconnect the power plug from the wall outlet as a safety precaution before carrying out any type of cleaning or maintenance procedure. Front Panel Cleaning Instructions • The front of the display has been specially treated. Wipe the surface gently using only a cleaning cloth or a soft, lint-free cloth. • If the surface becomes dirty, soak a soft, lint-free cloth in a mild detergent solution. Wring the cloth to remove excess liquid. Wipe the surface of the display to remove dirt. Then use a dry cloth of the same type to dry. • Do not scratch or hit the surface of the panel with fingers or hard objects of any kind. • Do not use volatile substances such as insert sprays, solvents and thinners. Cabinet Cleaning Instructions • If the cabinet becomes dirty, wipe the cabinet with a soft, dry cloth. • If the cabinet is extremely dirty, soak a lint-free cloth in a mild detergent solution. Wring the cloth to remove as much moisture as possible. Wipe the cabinet. Use another dry cloth to wipe over until the surface is dry. • Do not allow any water or detergent to come into contact with the surface of the display. If water or moisture gets inside the unit, operating problems, electrical and shock hazards may result. • Do not scratch or hit the cabinet with fingers or hard objects of any kind. • Do not use volatile substances such as insert sprays, solvents and thinners on the cabinet. • Do not place anything made from rubber or PVC near the cabinet for any extended periods of time. BDL4677XL 7.2. Troubleshooting Symptom Possible Cause Remedy No picture is displayed 1. The power cord is disconnected. 2. The main power switch on the back of the display is not switched on. 3. The selected input has no connection. 4. The display is in standby mode. 1. Plug in the power cord. 2. Make sure the power switch is switched on. 3. Connect a signal connection to the display. Interference displayed on the display or audible noise is heard Caused by surrounding electrical appliances or fluorescent lights. Move the display to another location to see is the interference is reduced. Color is abnormal The signal cable is not connected properly. Make sure that the signal cable is attached firmly to the back of the display. Picture is distorted with abnormal patterns 1. The signal cable is not connected properly. 2. The input signal is beyond the capabilities of the display. 1. Make sure that the signal cable is attached firmly. 2. Check the video signal source to see if it is beyond the range of the display. Please verify its specifications with this display’s specification section. Display image doesn’t fill up the full size of the screen 1. The zoom mode is not set correctly. 2. Scan Mode may be set incorrectly to underscan. 3. If the image exceeds the screen size, Scan Mode may need to be set to Underscan. Use the Zoom mode or Custom zoom function in the Screen menu to fine tune display geometry and time frequency parameter. Can hear sound, but no picture Improperly connected source signal cable. Make sure that both video inputs and sound inputs are correctly connected. Can see picture but no sound i...