If there is a menu button on the tv itself, or on the remote your using press it and search through the menu, if it will let you, and find the reset factory settings, or something of that nature. Try that and see how it works out. Sorry i can't give anything excact, but i'm not familiar with LG products.
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It might be impossible to release the child lock, without its remote control. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Unlock procedure to many popular brand TVs are given.
You may not be able to remove the child lock without the remote. (as that is the whole point of it..lol) your best bet is probably to pick up a cheap "one for all" remote and see if that will remove it.
Hi what you can do is to buy a universal remote control for this TV to remove the child lock. You can get that online or on any electronic shops in your area. Once done here is the instructions on how to remove the child lock using remote.
Look at the "Power" indicator light on the front of the television to check if it is blinking. When blinking, the child lock is enabled. You can also check by pressing the "Power" button on the television.
Point the remote control at the television and press one of the buttons on the number keypad. The "Power" indicator light will stop blinking, indicating the child lock is turned off.
Lock the television again by pressing and holding the "Power" button on the remote control until the indicator light starts blinking. It takes approximately three seconds before the light turns on. Thanks
The power button on the TV doesn't work because of the child lock?
I went over the copy of your manual for your TV. It must be the child lock timer problem.
I would try leaving the TV unplugged for 30 mins and see if that reset the TV and releases the lock.
If it doesn't work, the remote needs to be replaced. A universal remotes aren't really universal when you need to use special buttons. The remote made for the TV is the best.
If your TV is the model 47PFL7403D, here's the cheapest place to buy a replacement. http://www.philips.newremotecontrol.com/catalog_item.php?catnum=313922852812
frist see if the control panel on your tv works, if so then check and see if the eye on your tv is dirty sometimes they are hard to get to i took my pocket knife and cleaned mine or air in can should work. when the eye gets dirty on the tv it won't respond to the remote. hope this helps
To unlock the Panel Lock,
Parent Lock, or Child Lock, follow these steps:
Turn on your TV.
On the remote, press
the Menu button. The Set-Up
Scroll to the Key
Lock function and set
function to Off.
Press the Exit button to exit.
Note: If you don't have a remote, you may
be able to do the same thing by pressing the Menu button on the front or side
panel of your TV and using the volume or channel up and down buttons on the
TV to scroll to the Key Lock function and set it to Off.