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If you have a blank screen with a red key on the bottom left, simply
press the (function or F) button and the mute button at the same time. If your TV asks for a 4-digit code or password please enter 3308 or 6688 to unlock the screen or reset any preset rating levels. If you have a GT2011J or GT2011S Television, hold the (Display) button
for 10 seconds, it will unlock the screen. If password or code is
requested, try 3308 or 6688. Let me know if this helps.