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I have a year-old TV from LG. Changing channels with the numeric buttons take around 4 seconds, while using the increment/decrement buttons I have to wait only one second. Strange!

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Is is because it is waiting for a multi digit input? You can try to enter 01 for preset 1 or 001 depending on how many presets your TV has.

Ah, of course! That must be the reason.

You might be able to hit the OK/Confirm button to switch faster.

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