Question about ViewSonic N3735W 37 in. LCD TV

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I need to replace the small IR board in my Viewsonic N3742W LCD TV. I have the board and have taken out all the screws ion the back panel. I just don't seem to be able to separate the cases to get at the IR board.

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You need a piece of hard plastic about 1"x2" about 1/8 to 1/4" thick.

On one end(a 1" one) you cut a bevel at about a 30-40 degree angle. Use this "sharp" edge to shove between the two pieces gently and pry them apart with a rolling motion. TVs, laptops, and lots of other devices use a combination of screws and an interference fit(snap together).

You can try prying gently with a screwdriver but it's very likely that you will damage the case. If you have some very hard wood that will work as a good substitute for the plastic as well.

Posted on Jul 26, 2009

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One thing you can do is take your cellphone's camera, point the remote at the camera, and press a button. You should be able to see the infrared sensor firing.

If you can verify that, your remote's fine.

In this case, what you have is a bad IR sensor board. The part # is:
313926859182. Right now, there are so many of these things failing, that finding the original might be difficult.

Don't fear, though; it's a small part. And, best of all, it's cheap. Expect to pay around $5.00 for the part, maybe a bit more, maybe less, depending on the supplier.

Now, if you are handy with a power drill (fitted with an octagon/star bit for the back of your set), you can remove the 20 or so star-bit screws from the back of your television. Don't worry about putting the set on the floor. If your TV is on a stand, simply turn it around. You'll need to remove the stand screws, but you won't need to take the TV off of the stand.

Now that you've taken the screws out and removed the back cover, look in the lower left hand area of your set. You'll see a 4 inch long circuit board with 2 cables running to it. Pull the cables out (they'll come out easy). Remove the 2 star-bit screws.

One of the board's sides is under a plastic tab. Lift the board out of its slot from the other side.

Put your new board in, reconnect the two cables, reassemble the back and you are set to go.

Expensive repair for a few bucks and a better IR sensor.

*****************************************************************

This advice assumes that the control buttons (power, volume, channel) located on the side of the set still function. It also assumes you are able to use those buttons to power on the set and verify that you still have a picture on the screen.

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1 Answer

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IR senor may not be bad. Try using a different remote (universal) and program to TV. If universal remote works and your doesn't, you may need to purchase a remote instead of IR board. If you confirmed that the IR board is bad then replacing the IR board will fix the remote issue. IR board is an easy fix. Just open the back cover out and it's located right in the middle toward the bottom of the TV.

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1 Answer

Tv not letting remote work. Have 2 remotes it is the TV. Philips


what you have is a bad IR sensor board. The part # is:
313926859182. Right now, there are so many of these things failing, that finding the original might be difficult.

Don't fear, though; it's a small part. And, best of all, it's cheap. Expect to pay around $5.00 for the part, maybe a bit more, maybe less, depending on the supplier.

Now, if you are handy with a power drill (fitted with an octagon/star bit for the back of your set), you can remove the 20 or so star-bit screws from the back of your television. Don't worry about putting the set on the floor. If your TV is on a stand, simply turn it around. You'll need to remove the stand screws, but you won't need to take the TV off of the stand.

Now that you've taken the screws out and removed the back cover, look in the lower left hand area of your set. You'll see a 4 inch long circuit board with 2 cables running to it. Pull the cables out (they'll come out easy). Remove the 2 star-bit screws.

One of the board's sides is under a plastic tab. Lift the board out of its slot from the other side.

Put your new board in, reconnect the two cables, reassemble the back and you are set to go.

Expensive repair for a few bucks and a better IR sensor.

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1 Answer

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Check the power board, capacitors seem to be possibly faulty on this model. TV will need to be taken apart.

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