I have this model N3735w Viewsonic LCD flatscreen TV and it is flickering. The screen is also getting darker.

Replace the LED back lights strips.

I've seen a few of these.
They don't seem to be an indicator that the set is going to fail soon. The only fix seems to be to replace the screen but that is more cost than replacing the whole TV.

sounds like ribbon cable fault re bad joints

check and see if any capacitors are domed over.

Is it model VX2235? The VX series are known for bad caps problem, http://s807.photobucket.com/albums/yy352/budm/VIEWSONIC/Viewsonic%20VX2235W/

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

This problems alway the causing of the board,that call the T-CON decodering board it is dying.This T-CON decodering board alway sit in the middle at the bottom of the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a rrefurbish T-CON decodering board for the replacement.

tv has blue screen

pushed button mts/sap

Buy a monitor that wil accept your video card size  resolutions? 

I had the same problem with a Viewsonic N3735W LCD TV and Comcast Customer DVR 3 Device remote. I contacted Viewsonic and they gave me 11454 which works.