Thanks for sticking with us as we attempt to troubleshoot this with you.
A "service remote" is required to remove the set's parental lock.
You can access the same features of a "service remote" with a little re-engineering of your remote.
You must get the set into TEST mode - which is a function of the service mode.
First, open up the remote control.
I find this easily done by prying the bottom half of the case outwards at the rear end and then sticking another screwdriver in to the gap to hold it open.
Then work your way around the case prying outwards on the bottom half, this should release the latches without any trouble at all.
With the case open you'll notice that there many buttons that are normally not accessible. Some of these don't have an actual "switch" under them, but others do. The two that are of interest here are...
**the one directly under the "lock" button (that runs the parental controls)
**to the left of that one, x'ed below:
[ ] [lock]
With the TV on, press the left button and then the right (no holding required.)
The word TEST should appear in the upper right corner of the screen.
The number keys select different menus.
Channel + and - keys change the highlighted setting.
Volume + and - change the value.
Once in test mode:
1) press #2 to get to menu 2
2) press channel down to get to the Shippping
3) press volume up or down to reset TV
Now the TV will be in shipping condition with password XXXXX to '000000'
I cution against changing anything else in the service menu - as it can render your set un-watchable.