Remote controls are disabled for various reasons: contamination of contacts, damage to the resonator, LED. A successful repair of the control panel is only possible if the location of the malfunction is determined correctly.
Instructions
Step 1
Take a mobile phone with a camera function. Turn on the appropriate mode in it, and then direct the remote control LED to the camera lens. Press all the keys on it in turn.
Step 2
The flashes of the infrared LED of the remote control are not perceived by the human eye, but are detected by the phone camera. If it turns out that the LED flashes when you press some keys, but does not respond to pressing others, look for a malfunction in the keyboard. Chaotic slow switching on and off of the diode without reacting to pressing any keys indicates a failure of the resonator. Finally, the complete absence of luminescence may be due to a malfunction of both the resonator and the batteries or LED.
Step 3
In the latter case, before opening and repairing the remote control, change the batteries in it, observing the polarity and re-check the device. It may not need to be repaired after that. If it turns out that the reason is not in the batteries, remove them, and then disassemble the remote control. If the keyboard malfunctions, clean it by placing all parts of the device, except for the batteries, in a bowl of water with a little dishwashing liquid added. After keeping them there for about two hours, remove and dry at room temperature for a few more hours. Do not try to speed up the process with a hair dryer - this will cause the board to warp and eventually fail.
Step 4
Reassemble the remote, insert the batteries and check. If after that not all the keys work, the reason is the depletion of the conductive layer on the contact pads of the rubber pushers. Restoring it is troublesome.
Step 5
If the LED or resonator is faulty, solder it out. Please note that the LED is a polarized element, so before soldering, sketch out which of its leads was soldered where. Also note that resonators are shock-sensitive and therefore fail much more frequently than LEDs. Take the defective part with you to the electronic components store, where you show it to the seller - he will pick up another one that matches the parameters. Be sure to say that you need an infrared LED, and a resonator at exactly the same frequency as that of the sample.
Step 6
After soldering a new diode or resonator, assemble the remote control and check it again using the phone. Then try it out with your TV. It rarely happens that the remote control, which flawlessly generates infrared flashes when you press the keys, does not work clearly with the TV. This means that the latter has a faulty photodetector or dirt has accumulated between it and the window in the front panel. The TV should only be cleaned and repaired by qualified personnel as it contains high voltage circuits.
