Hitachi UT37V702, UT42V702 Troubleshooting, About LCD Display Technology, Symptom and Checklist

TROUBLESHOOTING

About LCD Display Technology

The following are common phenomena occurring when viewing LCD display devices due to its characteristics. Please note that these are not malfunctions.

Defective Spots on Panel

The LCD panel is manufactured with high-precision technology. However, there might be some spots that are not illuminated, or are brighter than others, or are in different colors, etc.

Surface on Panel

The LCD panel displays images by the fluorescent lamps internally. This can raise the temperature of the display surface.

In addition, do not allow any heavy impact to the front of the panel because the LCD panel is made of high precision glass.

Use Under Low Temperature Conditions

Because of the structural characteristics of the LCD panel, the response speed of the LCD panel becomes slower when the ambient temperature becomes too low. In some cases, this may result in a residual image.

The residual image will disappear of its own accord as the temperature rises again to a normal level.

Before calling a service technician, check the following tables first. If the problem cannot be solved with the suggested procedures, contact 800-HITACHI. For your safety, NEVER try to repair the product yourself.

When the Following Messages Appear on the Screen

Message	Condition / Action	Page
Power Save	This indicates it is in Power Save mode. (in HDMI/RGB mode)	42
	This message appears 5 seconds before Power Save mode starts.
	The indicating lamp lights in orange.
	The unit cannot detect any signals from any input terminals.
No Sync. Signal	Check if the cable is connected correctly and firmly.	18 ~ 21
	Check if the power of any external equipment is ON.	42
	Check if the input selection matches the connection terminal.
	Check if the PC is in Power Save mode or not.
Invalid Scan Freq.	The unit receives unsupported signals.	46 , 49
	Check if the cable is connected correctly and firmly.
	Check if the input signal is compatible with the specification of the monitor.
Not Available	This shows when the selected operation is not available.
Auto Adjusting	This indicates that it is in the process of auto adjusting. (in RGB mode)	39

Symptom and Checklist

Symptoms	Checklist	Page
	Ensure the Main Switch is On.
	Check the Indicating lamp status (Off, Red, Green, or Orange).
No picture - no sound	Check the connection of the power cord and/or other cables.	18 ~ 22
	Check if the power of the unit or external equipment is ON.	24 , 44
	Check if the correct mode is selected.
	Check if the unit is in “Standby mode” or “Power Save mode”.
	Adjust the values in “Picture menu” and “Audio menu”.
Multiple images-normal sound	Check the connections to external equipment.	18 ~ 21
Intermittent interference	Check if the source of interference is shielded correctly.
	Move these kinds of electrical devices away from the unit.

43