I now have fixed my TV and wanted to come back with info on what I did. The sumptom was the TV would respond intermittently to IR commands from my Cable and harmony remotes but would work ok using the TV remote which was paired to the TV using Bluetooth (not IR).
There is a very small IR receiver board in the TV (approx 0.4" x 2.25") which is located in the lower right side corner of the TV (as you face the screen). You must open the TV to get to the board and this involves removing 8 long screws from the base, 4 long screws from the sides and 15 5/8" screws from the sides. There are also 6 machine screws with washers (input panel, mark their locations), 3 - 10mm self taping screws (input panel) and one hex nut (input panel).
After opening the set (removing the back panel) I found the IR board (see pictures). For the SV472XVT TV this part is mostly unavailable. I finally order a similar part (board number 3642-0042-0189) which would not fit the mounting space. If you have good soldering skills you can remove the IR sensor from this board and replace the sensor on the correct board (3642-0072-0189). It is best to cut the leads of the defective part and pull them out while heating with the soldering iron. Do not cut the leads of the new sensor but it must be removed from the replacement board. You will need to use solder wick to remove the solder from the holes.
After replacing the IR sensor, I installed the board and set the TV upright and tested it using my Harmony and Comcast remotes. It worked perfect.
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I want to add an update for checking your remotes. If the remote is IR (not paired using bluetooth) you can point your phone or tablet camera at it and press any button on the remote. You should be able to see the IR on the phone screen as a pulsing or steady light. This also works for Harmony remotes that use a hub, just point the camera at the hub instead of the remote. This way you can check a remote to make sure it is functioning. Ron
par Whole Witt
Having same problem with my E3D470VX model no remote will work will aslo look into replacment of ir board
par Lance Mattson
Thanks! Same Problem
Have a Vizio 42" XVT3D424SV and have two Vizio keyboard VUR10 remotes. So the other day the VUR10 I had been using regularly stopped working. After having tried the Vizio Support remote reset procedure which included replacing the batteries and removing plug from outlet a few times with both remotes had limited to no success. One VUR10 stayed totally dead the other VUR10 would only power on the TV - no other remote finction worked. Called Vizio support who protocol is first to suspect the remote is the problem. However, since I tried unsuccessfully to program a Comcast universal remote I have concluded it is the TV IR sensor and not the remote. Vizio support did provide this link to VizParts for IR Sensor part #: 3647-0012-0189 however, they only had re-certified not new part. This IR senor seems to be in short supply: I have ordered a new part from ebay we will see if new and if it works.
I may be our of sequence or redundant but to follow up on Whole Witt's post regarding mobile phones, tablets, etc... the Play Store has a "Peel Smart Remote" app for android (not sure on iPhone) that can duplicate a remote (if the phone is IR capable), which is another way of isolating whether original/replacement TV remote is operational/faulty... I apologize if this point has already been established... and still grateful Whole Witt got me looking at my IR board (which was bad, and replaced easily at low cost)... odd that it appears there are quite a few apparent issues with Vizio IR boards--but I am sure they sell millions of TVs and my scale/scope of the issue is likely very incomplete...
I have a Vizio E32H-C1. The IR is NOT bad, although Vizios "go to" is to sell you a ton of remotes. When the TV does respond it is very slugglish. I have done the "power cycle" and have managed to to the reset thru the TV's menu. The TV for the most part is non-responsive. It is only 2 years old. This is isn't the first time this TV has done this, although other times a power cycle has resolved the issues. Multiple remotes have been used with the same result extremely sluggish response. It take about 15 minutes to raise the volume 2 clicks and the is not a manual button on this TV for audio, only power. Talking to Vizio is worthless.
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