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Vizio VF551 VXT - IR Sensor Issue    
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mx1alex



Joined: 28 Apr 2017
Posts: 1
Location: Missouri

PostPosted: Fri Apr 28, 2017 5:43 pm    Post subject: Vizio VF551 VXT - IR Sensor Issue Reply with quote

So after doing some online research I have come to the conclusion that the IR sensor on my Vizio VF551 VXT has quit working. It took removing about 50 screws to get to it and remove but now the problem is I can't find a replacement!

Anyone have any idea where I can find this part? I have found some similar but they are not the exact same part number so I'm not sure they would work.

3655-0012-0189

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JTS1957



Joined: 21 Jan 2009
Posts: 2343
Location: Far, Far Away

PostPosted: Sat Apr 29, 2017 12:56 am    Post subject: Reply with quote

Almost any 3-terminal remote sensor will work - at least well enough for testing/proof of correct diagnosis.
The three terminal sensors from many junk TVs are easily obtained.
From following the traces on the boards it should be possible to identify 1) the ground pin; 2) the B-Plus pin & 3) the signal pin.

You may find that the set still doesn't respond to a/the remote (you could always check for B-Plus with a DVM and signal on the signal pin with a oscilloscope), in which case the Main board is suspect.
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