Question about ViewSonic N2750w 27 in. HD-Ready LCD Television

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ViewSonic N2750w 27 in Volume turns down by itself tv can be on for a couple of minutes then turns down completely try to turn the volume up with the remote. will turn back down

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  • rrazo Dec 13, 2008

    I have a ViewSonic N2750w and I turned it on this afternoon and suddenly the volume started turning down by itself. I unplugged the TV for about 10 min, plugged it back, without any luck. It never did that before. If I try to access the TV menu or the setup menu, what ever option is selected it decreases the value to it's minimum like if the left arrow was being pressed. I'm leaving it unplugged the rest of the night and see if by the morning something happens. Also I've been having an issue turning it on or off with the remote... I have to do it at least a couple of times. If I try to turn it on, I see the light on for a few seconds and then it goes off. The same way if it's on and I try to turn it off, it stays off for a few seconds and then it turns itself on again. I have no clue what the problem could be.

  • Anonymous Mar 29, 2014

    Please, Problem with ViewSonic N2750W TV works for about 3-5 minutes.Then off picture, only sound. Tks

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  • 286 Answers

Could be a problem with the down volume button on the tv. the board it's on ir its harness. Check them all. Make sure the volume buttons plastic actuator moves freely and is not stuck.

If these parts are all good, you have a problem on the main board. You may have to trace the control lines as far as you can and check any capacitors along the way. If you have an oscilliscope you can test the lines to see if the up volume is working correctly. If there is noise on it, you might find a bad capacitor if you can trace it back far enough. Schematic helps here.

Of course, make sure nothing is shining on the sensor window on the TV. You might want to scope that line as well (IR sensor line).

If none of that helps, get hold of Viewsonic and find your closest service provider. You can order a main board from them.

Of course, you could try just using the audio out jacks to an amplifier or a surround sound amplifer. Then you would use the remotecontrol for the surround sound system to control your volume.
Bet you were going to buy one anyway right?

Posted on Feb 14, 2008

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