Many households have 5 or 6 remote controls laying around the house. Sometimes, it stops working and you don’t know what happened.
Most remote controls use infrared light to transmit the signal. The human eye cannot see this light, however a camera can. follow below steps to check whether your remote is working or not
Take the remote control that you think are not working
Take a digital camera or cell phone with a camera.
Turn the camera on mobile phone, all you need to do is look at the mobile camera while performing the process.
Point the remote towards the lens of your mobile camera as you would when pointing the remote towards the TV. similar to below picture
Press and hold any button on the remote while viewing the screen on the camera, you can able to see blue shade light on your mobile camera screen. see below picture for how the light will look like,
Note: some buttons may not transmit signals via default. Best button to try first is the power button.
Before pressing any button on the remote, In your mobile phone camera screen, you can’t able to any glow on the LED.
Before pressing and hold any button the remote. In your mobile phone camera screen, you can able see the blue/violet LED glow. It says that your remote is working perfectly. Even after if there is no light, your remote gone bad.