I've tried several remotes and I know the original one is working as I can see the IR light in a video camera but the TV will not respond.
My TV does respond to several channels from the remote , but not to all of them. Would this still be a problem of the RI componant?
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Hello There is a infrared light sensor inside the TV which detects the infrared rays emitted from the remote control, when we press each button on the remote control. If this sensor has got damaged, the set won't respond to any remote control handset. The sensor can be located just behind the infrared sensor window at the front panel of the TV. To access it, you have to open the TV. It is a three terminal component, will be soldered diretily to front panel circuit board, of with the main baord itslef. Will look somewhat brownish black in colour. There are so many types can be seen . Just look what type if fitted with your TV. See some models infrared sensors. Check out which type your TV has.
First of all, thank you for posting your question here at Fixya.
My first advice is to confirm if the remote control is not the issue here and ensure that the fault came from the TV itself. Point directly your remote control's infrared emitter(Sensor) to your cellphone camera and then press any button key at the remote control, you will be able to see the flash of an infrared through your camera if the remote control is working fine. Watch the video below to have an idea how you gonna do this.
If you've confirmed that the remote control is not faulty, this is an indication that the problem is on the infrared receiver inside the TV. I would advice you to clean the TV's front panel infrared lens using a soft cloth, keep away all obstruction from the IR receiver, turn of the bright light in the room and check if the symptoms still persist. If yes, then the IR receiver inside the TV is already faulty and needs to replaced with a new one.
Is this the original remote or another remote? There are a few things to check. First try new batteries in the remote. (If it is not the original remote, check that the code hasn't been changed.) Next do the buttons on the TV itself work?
If the TV responds to the buttons on the unit, then use a digital camera to take a picture of the remote (the IR beam side) when someone presses a button. Looking at the picture you should see light from the remote. If you do not see any light, then replace the remote.
If the remote is sending a signal, then the receiver has failed. You may be able to replace this at partstore.com or shopjimmy.com. First try searching on the model. If that fails, open the tv and record the part number. Search for the part itself (since many parts are used for more than one model, it may be listed for another brand).
If the buttons on the tv do not work, then the entire board probably has failed. Again try to find the part.
Take the remote, go to menu, scroll down until you find picture settings, continue until you find ant catv, push the right arrow until the cursor is over catv, press enter, that should restore your regular channels.
A universal remote is not a reliable way to test a remote control. If you can have an original remote this is the best way to test the remote function of the set. Or, if you have another set that is the same model as yours to test a universal remote, then the test would be acceptable.
If the remote has failed on the TV side, this can be from a number of problems in the set. It can be the remote IR sensor module itself, or one of the buffer amplifier stages on the way to the uPC, or the uPC itself. In some models the buffer amp is built in to the IR sensor module.
Without properly troubleshooting this fault, there is no possible way to actualy determine the point of failure. More than 90% of the time, the failure is the remote. Remotes get dropped, and abused often, and therefore they are subject to a high degree of failure.
Did you try unplugging the set from the AC mains for at least 15 to 20 seconds? This will cause a reset to occure for the uPC. If the fault is still there the set and the remote control will need a proper follow-up to service it.
I don't know of any adjustments for the IR receiver but the receiver itself could have gone bad or something may be blocking the IR lens not letting the IR signal get through.
Maybe (but unusual) there may be a cold solder joint in the IR circuit.
Sometimes dust will collect on the inside of the IR lens causing this problem.
You can verify the operation of your remotes by
holding them close to an AM radio receiver and pushing the buttons. You'll hear a popping sound through the radio speaker whenever a button is pushed. You may have to tune the radio up or down the band to pick up the remote's signal.