Samsung 46 " lcd backlight dims and brightens by

May backlight issue add a picture

Before you buy a new TV go through all the TV menu options to see if it has automatic dimming depending on the amount of light in the room. If it does it may be malfunctioning and turning that feature off may fix the problem.

Yah kindly follow this tip. After loosing the back cover when the tv power cord is removed from power socket, check for bulged or defect power capacitors in both the primary & secondary side of the power pack if found any kindly replace it with the actual or equivalent value as this electrolytic capacitor defects is much common for Samsung power packs

when it flickers is it lines that go up and down or across the screen or is it flickering bewteen lighter and darker?

Intermittent backlight lamps or backlight inverters.

If this model has an auto-dimming feature, try disabling that feature.

set has a light sensor. go in menu and turn light sensor off

You can brighten or dim the LCD screen by pressing the Fn key plus another key with the a sun symbol eg the UP & DOWN arrow keys or one of the F3 to F12 keys - it varies depends upon the model of the laptop.
If you cannot vary the brightness of the LCD screen the you have a faulty backlight.

Connect an external monitor to the laptop and power it up, if you see a clear image on an external monitor, this means your video card is OK.

If you see a dim image or flicking image on the LCD screen it means you have a backlight problem.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

you need a T-con board, if there is no backlights at all it could be the power supply

I too have the same problem with the same monitor.. tv looks great OSD looks great.. pc is dim.. This has nothing to do with the inverter board or the backlight.. I believe that there is an issue with the components that render the Computer video.

I had a problem with a Samsung 46 inch LCD and it had audio and dim light but no picture and found out that the logic board toward the top (inside tv) was bad and was no longer available and the only way to fix it was to get the entire display panel (the logic board came with it) It was not costwise to repair. Hope this helps.