Question about ViewSonic N4785p 47 in. LCD TV

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Replacement mainboard for viewsonic n4785p lcd tv

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Go to then find the link to the parts store at the bottom of that page. I only would do it after you have verified the warranty is expired per Viewsonic. If it is OOW, then you can call them for a service manual that contains schematics, troubleshooting flowcharts, etc.

Posted on Aug 20, 2010


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Screen has been washed with window cleaning solution & now has a shadow

You probably used too much liquid and it has now seeped inbetween the display screen and the backlight panel.
You would have to fully dismantle the TV and Screen to do this (not recommended unless you know a lot about TV repair).
Some of the liquid might evaporate over time but it is not likely to return to it's original state.

Feb 14, 2013 | ViewSonic N4785p 47 in. LCD TV

1 Answer

My Viewsonic 4785P is out of warranty. Problem is showing in different ways: image stays but sound goes then comes back, or not; everything shuts down and then comes back, or not; other times there is a...

A problem like this can be caused by RF interference. Shut it all down again and move the converter, any cordless or cell phones, wireless PC's, routers, etc. so nothing is within 3 feet of your set. A poor ground on your converter can also cause RF interference. Make sure you have a grounded plug going to it, and it is connected to a grounded wall outlet....likewise for your set....and by no means have it near a microwave oven!

Apr 10, 2011 | ViewSonic N4785p 47 in. LCD TV

1 Answer

Input window is continuouosly on

usually this is cleared and restored with a display button on the remote or within the display menu on the set

Dec 30, 2010 | ViewSonic N4785p 47 in. LCD TV

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Code for Motorola MXv3 remote control

I used 0047 for my viewsonic n4785p LCD TV

Nov 27, 2010 | ViewSonic N4285p 42 in. LCD TV

1 Answer

Dark shadow in middle of TV when turned on . Last...

the cold cathode lamp of your tv is nearly to be busted and needs replacement..tnx

May 20, 2010 | ViewSonic N4785p 47 in. LCD TV

1 Answer

Any button on the remote brings up the menu screen but you can't do anything because it just shuts off and goes back and forth between regular screen and the menu screen

there might be a problem on your remote control open the casing of your remote control and clean the butoons contact point wipe it with a cloth or spray it with a contact carefull of cleaning the contact they are just carbon contact dont wipe too hard carbon might include....use cleaner that instantly dries up.

May 21, 2010 | ViewSonic N4785p 47 in. LCD TV

1 Answer

My TV is just over a year old and out of warranty. When i turn the TV on, I can see a backlight/glow to the screen, but there is no picture, not even the usual screensaver blue screen I usually have on...

Sound like ur Tuner board have problems or dead.Tries unplug,replug the tv an hour later let it reset itself.The tv might work again,somtimes u have to turn the off/on the power button again couples times to make the tv work.Not replaced the Tuner signal board should solved ur problems.

Apr 19, 2010 | ViewSonic N4785p 47 in. LCD TV

2 Answers

No picture or indication its on

did you check if the bulb was burnt out

Jan 13, 2010 | ViewSonic N4785p 47 in. LCD TV

1 Answer

Viewsonic VG919S 19" LCD


You must focus to mainboard of LCD monitor find the voltage regulator IC. Voltage test the regulator IC use digital or analog multimeter range 10v dc connect the negative to cold ground, these regulator providing a constant supply of 2.5 - 5v to all IC in the mainboard. check the scalar IC. Because scalar IC will convert analog input signal of Red, Green & Blue. Lastly check the controller board, check the ribbon cable connector from mainboard to
controller board for lose, check the fuse inside controller. I think the exact problem of your monitor could be either the (mainboard) or (LCD panel where the controller board is located).

Oct 06, 2007 | ViewSonic VG910S (Black, Silver) 19" LCD...

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