How can I fix a remote control that isn't working?

You can fix a remote control that isn't working by troubleshooting battery, programming, interference, and physical damage that prevent signal from reaching device. First, replace battery, as dead battery is most common cause, with coin cell or AAA costing few dollars, ensuring correct polarity and fresh battery, and clean battery contacts with dry cloth. For garage door remote, check if remote lost programming due to power outage, so reprogram by pressing Learn button on opener motor unit and pressing remote button within 30 seconds until opener light blinks. Check if wall console is in lock mode that disables remotes, indicated by blinking light, so press and hold lock button for 5 to 10 seconds to unlock. Inspect remote for physical damage like cracked case, water intrusion, or worn buttons that cause poor contact, and if buttons worn, open remote and clean contacts with electrical contact cleaner or replace remote costing 30 to 60 dollars. Check for radio frequency interference from LED bulbs in garage door opener that are not opener-rated, as LEDs can block signal, so replace with approved bulbs. Ensure antenna wire on opener hangs down straight for range. For TV remote, clean infrared emitter and receiver sensor, and ensure no obstruction. Try remote close to device to test range. If remote still fails after battery replacement, reprogramming, and cleaning, circuit board may be damaged and replacement needed. For smart remotes, reboot device and remote by unplugging for 30 seconds. Regular maintenance like keeping remote dry extends life.