Hello
Your remote controls' infrared light emitting frequency may have changed to a little. It may be due to an IC trouble inside it, or oscillator crystal used as standard reference frequency generator. You just open your remote control and replace the oscillator reference crystal first. It can be resolder out from its internal printed circuit board, and can be got from any electronic spare part shop and is cheap in price too. Note its frequency marked on it and buy. If it doen't help, the Ic may be damaged, and it is best for you to buy a new one, rather than trying to replace that IC. OK
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