SOURCE: Blue screen and red padlock
It sounds to me like a child lock function, which is usually what the screen + padlock is on TVs. Usually your original remote would have a button / sequence to unlock the mode. If you still have your original remote, look for a child lock button or refer to your remote manual (and/or TV manual for the child lock feature) to unlock the mode.
SOURCE: Unable to unlock Centrex tv model CTT6809SF
Try holding down the + symbol on bottom right hand side of controller for more than 4 secs
SOURCE: I have a logik TV RC-A22 there is a locked sign in red right top corner
Download the user manual to your Logik TV from net. It will have all details about the unlock procedure.
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