Apex model PF3225, The TV is Locked (blue screen with red key on the bottom left corner). Don't have original remote...please help

SOURCE: Apex TV locked out picture

• 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. This will unlock the screen and allow you to view the channel as desired.
  
  
• 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.

SOURCE: unlock apex tv model # AT2702

Please try this:

On the remote hold down the (F) function key and press mute.

SOURCE: my apex tv is locked.

You have to hold the button that looks like a flag (top left) and press either the mute or video button. I don't remember which one 

SOURCE: KLH TV LOCKED

press and hold menue button on the tv, for more than 10 seconds to unlock

SOURCE: APEX tv model #AT1302 My tv screen is black with a

child lock is active. Unlock press function and then mute on remote. only way to do it.