Now, I can get the part for $10. I just don't want to take the tv
to pieces and screw something else up. Does anyone have a service
manual? I'm handy enough with computers or regular board repairs. Just
need documentation to make me feel better about it. Thanks in advance...
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How old are the batteries in the remotes? The on/off signal from the remote is the same. There is some lattitude in the IR reciever module for what it accepts. Low battereis may be shifting the signal's frequency or light intensity enough for it to not be recognized.
If sunlight is failing on the sensor or the remote's IR emitter, that can cause interference. Other IR devices can also interfere with the IR signal such as a "Remote Extender" being used for something else.
It may sound odd, but if your remote was working one day and not the next- was the room rearranged? If so, look around for possible sources of interference blocking the beam from the remote, or shining or reflecting light onto the IR reciever module in the set.
You basically have to take the tv apart backward to get to the front. Start with the back panel unscrew all the screws. Then you will see the internals. IR sensor should be botton left side if you looking down on it.
The IR reciever should be in the front of the set where the remote IR window is located.
I can tell you that there is a lot more that can go wrong than just the IR reciever. There may be a buffer amp along the way to the uPC, or there may be a fault with the uPC itself. The fault may also be a cold solder connection, or a missing supply voltage to the the IR reciever or to some of the components involved in the IR signal process.
In opening and working on your set, there are serious safety issues involved. You should be giving the set out to a trained and experienced TV tech for proper and reliable service.
It sounds more like a problem with the TV, than the remotes. It's possible that the IR reciever or microprocessor for it have pooped out. It's something that would have to be serviced by a shop, but due to the age and size it would likely be cheaper to replace the whole TV.
First check if the remote control is sending an infrared signal. If the LED is flashing, this does not mean the Remote control is sending the IR signal. There is a separet Infrared LEd that sends the signal. To check the IR, point the remote control in a video camera or any camera with real-time monitor (phone cam, webcam, etc.) and press any button. You will see a white flash coming from the Remote control. thjis works best if the camera is black&white, for color camera, the IR is still visible but quite faint.
Another way of checking the IR (if you do not have a camera) is to press the RM in front of another device with remote control and while doing so, press the correct remote control . If that other does not function or functions erratically, then the remote control in question is emitting an IR signal.
If there is no IR coming out, the solder conection of the IR LED might be the problem. It is rare that the IR LED will be damage because the remote control is only 3 volts.
If the remote control does emit an IR signal, then the TV remote reciever is defective.
I had this problem with a CD player that I have fixed. The IR reciever looks like an LED (dark colored) with three pins (V+, signal, ground). Cost less than $3