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Hello. First, go to the menu -> System -> General and turn OFF Instant On. Then use the power button on the remote to turn the TV off and wait for 30 seconds.
Then, quickly, press 'mute - 8 - 2 - 4 - Power' on the remote. That should reset the PIN to 0000.
Now turn Instant On back on if you want to.
If that resolves your issue, please be sure to rate my answer 5 stars. Otherwise, just let me know if it does not.
No problem. Please be sure to rate my answer 5 stars. Bonuses are always appreciated.