This instructables is to guide you on how you can improve the sensitivity of the IR Remote Control. The model of the remote control is AXD7461 for your information.
Step 1: The Casing is Blocking the IR Signal
The common reason that IR Remote is not so responsive is because the casing is blocking the IR Signal. You can see from the image that the IR LED is like a bit too “deep” into the casing that even the cap of the IR LED is not so visible from the side of the remote control.