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The failure to IR sensor inside the TV is a very rare case. Check the infrared emission to the remote control first. Check it with fresh batteries. Make sure that it works well, before trying to replace the infrared sensor inside the TV. If you wish to get some details, http://electronicshelponline.blogspot.com/ Pull up older posts.
What you are dealing with is not a bad remote controller, the problem is from your IR Sensor. You will need to replace this IR Sensor. You Vizio TV has a common defect with the IR Sensor. Make sure you order the revised version so you don't encounter this problem again. You can find the IR Sensor here: 3637 0022 0189 0171 1671 0892 Vizio IR Sensor
tried with reset doesn't work, ok it could be the IR sensor at the front panel of the tv doesn't work. but before you replace it you need to ensure if your remote controller is working. have you tried to check the remote with camera trick just to know if the remote controller is sending light to the IR sensor of the tv.
Before I answer your question let me clarify something..
What sensor you need to replace is it on the remote IR (infrared) or the receiver on your TV?
Did you try other remote control?
How did you say that you need to replace the IR sensor or receiver on your TV?
To test the remote please use a digital camera..How? place the shot to infrared of your remote then look at the screen of your camera after that press any button on your remote and look if the IR sensor lights up..
Please answer all my clarifications for me to diagnose the exact problem..Because replacing of IR sensor on TV is difficult..
Thank you for using fixya and choosing my service..
most likely especially if it is revealed that some liquid has spilled and got into the tact switches, only cure is replace the tact switches
try this first - locate the IR sensor on the TV and cover it with the fleshy palm of your hand -if the problems stops then the IR sensor could be picking up IR interference from CCFL lamps etc.
Yes, most likely the sensor is at fault - more precisely it's connections to the motherboard are iffy. You must take the back cover off the tv and reseat them. While you are there check their soldering points - with age they tend to melt and get loose.
the IR sensor could be going bad or maybe it slipped down inside and now isn't getting good signal. Let me know if you want to open it up and do some checks.. If the IR sensor looks like its in a good place, it could be failing.