LG Electronics 42WS50MS, 47WS50MS Key Lock On message appears, After-image appears on the product

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'Key Lock On' message appears.

Problem		Resolution
The 'Key Lock On' message	The Lock function prevents the OSD settings from being changed
appears when pressing the	inadvertently. To release the lock, go to Menu and Option and disable
Menu button.	the Key Lock option.
The screen image looks abnormal.
Problem		Resolution
Is the screen position wrong?	yy D-Sub analog signal - Press the "AUTO" button in the remote control
	to automatically select the optimal screen status that fits into the
	current mode. If adjustment is not satisfactory, use the Position OSD
	menu.
	yy See if the video card resolution and frequency are supported by the
	product. If the frequency is out of range, set to the recommended
	resolution in the Control Panel "Display" Setting menu.
Do thin lines appear on the	yy D-Sub analog signal - Press the "AUTO" button in the remote control
background screen?	to automatically select an optimal screen status that fits into the
	current mode. If adjustment is not satisfactory, use the Clock OSD
	menu.
Horizontal noise appears or the	yy D-Sub analog signal - Press the "AUTO" button in the remote control
characters look blurred.	to automatically select an optimal screen status that fits into the
	current mode. If adjustment is not satisfactory, use the Phase OSD
	menu.
The screen is displayed	yy The proper input signal is not connected to the signal port. Connect
abnormally.	the signal cable that matches with the source input signal.

After-image appears on the product.

Problem	Resolution
After-image appears when the	yy If you use a fixed image for a long time, the pixels may be damaged
product is turned off.	quickly. Use the screen-saver function.