Preset Channel Setting
Only when the Preset Source is set as TV can the Preset Channel option be available. Press 
/ 
to select preset channels from
Source Lock
This function is used to prohibit watching a program from various external inputs, e.g. AV, 
/ 
to select a certain option, and then press 
/ 
to set an external input lock ON or OFF. If an external input lock is set ON, after entering this mode, the screen will display blue background with muting and a prompt Source Lock; during Source Lock prompt, Source Lock will remain if there is no other display on the screen. To watch a program from a locked external input, just enter Source Lock submenu to set corresponding status as OFF or execute the Unlock option in the Lock Set menu.
Child Lock Setting
Press 
/ 
to select the Child Lock option, and then press 
/ 
to set ON or OFF. If set ON, this control key will not respond, and the screen will display Child Lock when the key is pressed; if no other operation is made, the display will automatically disappear later. To resume Child Lock function, just enter the Lock Set menu to set Child Lock OFF or execute the Unlock option.
Max Volume Setting
Press 
/ 
to select the Max Volume option, and then press 
/ 
to freely adjust the max volume within the range of 0~100. After finishing the setting, the max volume in the Volume menu will not exceed the preset max volume; for example, if the preset max volume is 30, the volume in the Volume menu can not be increased any longer upon reaching 30; if the preset max volume is less than the value in the Volume menu, the latter will decrease along with the decrease of preset max volume.
Power on Volume Setting
Press 
/ 
to select the Power on Volume option, and then press 
/ 
to freely
adjust the volume within the range of 0~100. After setting a certain value (except OFF), the TV plays a program with the preset volume upon turning on, when set as OFF, upon turning on, the TV plays a program with the volume before turning off last time.
Unlock Setting
Press 
/ 
to select the Unlock option, and then press 
to clear all the lock settings, namely set all the lock setting options as OFF; the Preset Channel is set as OFF and max volume returns to 100 (except password).